Relevant bibliographies by topics / Tanins – Analyse

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Academic literature on the topic 'Tanins – Analyse'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 February 2022

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Journal articles on the topic "Tanins – Analyse"

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Souza, Diná Garcia de, Débora Baiocchi Princivalli Campos, João Gilberto Mesa Ucella Filho, João Paulo Silva Gomes, and Tatiane Kelly Barbosa Azêvedo. "QUANTIFICAÇÃO DE TANINOS PRESENTES NA CASCA DA Mimosa caealpiniifolia Benth. E SUA UTILIZAÇÃO NO TRATAMENTO DE EFLUENTES." Nativa 7, no. 6 (November 11, 2019): 789. http://dx.doi.org/10.31413/nativa.v7i6.8631.

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Este estudo teve por objetivo analisar as concentrações de taninos existentes na casca das árvores da Mimosa caealpiniifolia Benth., e seu potencial para tratamentos de efluentes. As cascas foram retiradas de cinco árvores de uma área experimental localizada na Universidade Federal do Rio Grande do Norte, Campus Macaíba. Estas foram secas e moídas para redução de sua granulometria. Em seguida foram realizados a extração dos taninos e determinação do teor de sólidos totais (TST), teor de taninos condensados (TTC) e índice de Stiasny (I). Para caracterização do efluente foi analisado o índice de turbidez/NTU, pH inicial e cor aparente. O valor médio encontrado para TST, I e TTC foram, respectivamente, 11,30, 71,43 e 6,56%. O índice de turbidez/NTU e pH, encontrados foram 1,77 e 5, respectivamente. Os taninos sem modificações químicas têm pouca eficiência na remoção de turbidez, no entanto, foi comprovado que o tanino possui aptidão a coagular.Palavras-chave: coagulante; floculação; substâncias tânicas; Caatinga. QUANTIFICATION OF TANNINS PRESENT IN THE BARK OF Mimosa caealpiniifolia Benth. AND ITS USE IN EFFLUENT TREATMENT ABSTRACT: This study aimed to analyze the concentrations of tannins in the bark of Mimosa caealpiniifolia Benth. trees, and their potential for effluent treatment. The bark was removed from five trees in an experimental area located at the Federal University of Rio Grande do Norte, Campus Macaíba. They were dried and ground to reduce their granulometry. Next, tannin extraction and determination of total solids content (TST), condensed tannin content (TTC) and Stiasny index (I) were performed. To characterize the effluent, the turbidity index/NTU, initial pH and apparent color were analyzed. The mean value found for TST, I and TTC were, respectively, 11.30, 71.43 and 6.56%. The turbidity/NTU and pH index found were 1.77 and 5, respectively. The tannin without chemical modifications has little efficiency in removing turbidity, however, it has been proven that the tannin has ability to coagulate.Keywords: coagulant; flocculation; tannic substances; Caatinga.
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Datu, Lysa L. "Efek Fotoreduksi Besi dari Fraksi Daun Cengkih (Eugenia aromatica)." Jurnal MIPA 4, no. 1 (February 11, 2015): 36. http://dx.doi.org/10.35799/jm.4.1.2015.6902.

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Telah dilakukan penelitian untuk menganalisis kandungan fitokimia fenolik, flavonoid, tanin dari limbah daun cengkih dan menguji kemampuannya dalam memfotoreduksi. Daun cengkih diekstrak dengan pelarut etanol 80% secara refluks selama 2 jam dan dipartisi dengan petroleum eter (PE), etil asetat (EA), n-butanol (B), etanol (E) dan akuades (Aq). Selanjutnya ekstrak hasil partisi dianalisis kandungan fitokimia fenolik, flavonoid, dan tanin. Pengujian fotoreduksi dilakukan pada cahaya flourescents dengan konsentrasi 1000 ppm selama 5 jam.Hasil penelitian menunjukkan bahwa ekstrak EA memiliki kandungan fenolik, flavonoid dan tanin yang paling tinggi serta menunjukkan efek fotoreduksi yang baik dibandingkan ekstrak lainnya.Research had been carried out to analyze the phytochemicals phenolic, flavonoids, tannins of clove leave and test the ability in photoreduction. Clove leave extracted with ethanol 80% in reflux for 2 hours and partitioned with petroleum ether (PE), ethyl acetate (EA), n-butanol (B), ethanol (E) and aquades (Aq). Then extracts were analyzed the content of phytochemicals phenolic, flavonoids, and tannins. The results extract partition read on a spectrophotometer UV-Vis and IR. The photoreduction tests performed on fluorescent light with a concentration of 1000 ppm for 5 hours. The results showed that extract EA is the most high content of phenolic, flavonoids and tannins and good effects in photoreduction than other extracts.
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., Surahmaida, and Prasetyo Handrianto. "Analisis Kandungan Kimia Daun Dan Batang Sembukan (Paederia Foetida) Dengan Menggunakan 2 Pelarut Yang Berbeda." Journal of Pharmacy and Science 3, no. 2 (July 16, 2018): 23–27. http://dx.doi.org/10.53342/pharmasci.v3i2.112.

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ABSTRAKTanaman sembukan (Paederia foetida) atau yang lebih kita kenal dengan daun kentut merupakan tanaman yang biasanya digunakan oleh masyarakat sebagai obat diare atau obat kembung. Kandungan senyawa metabolit sekunder tanaman sembukan perlu dikaji lebih lanjut untuk penemuan bahan obat baru. Tujuan dari penelitian adalah untuk menganalisis kandungan senyawa metabolit sekunder yang terdapat pada daun dan batang sembukan dengan metode maserasi yang direndam ke dalam pelarut etanol 96% dan metanol selama 5 hari. Ekstrak etanol dan ekstrak metanol pada masing-masing daun dan batang kemudian dianalisis dengan menggunakan reagen kimia untuk mengidentifikasi senyawa alkaloid, saponin, tanin dan flavonoid. Hasil skrining fitokimia menunjukkan bahwa pada ekstrak etanol dan metanol batang sembukan mengandung alkaloid, saponin, tanin dan flavonoid. Sedangkan pada ekstrak etanol dan metanol daun sembukan mengandung alkaloid, tanin dan flavonoid. Selanjutnya senyawa metabolit sekunder tersebut dianalisis aktivitas biologisnya.Kata kunci: Analisis senyawa metabolit sekunder, ekstrak etanol dan metanol daun dan batang sembukan (Paederia foetida), maserasiABSTRACTPaederia foetida or more familiar with fart leaves is a plant that is usually used by the community as a drug or bloated diarrhea. The content of the secondary metabolite compound of the Paederia foetida plant needs to be studied further for the discovery of new drug ingredients. The purpose of this research is to analyze the content of secondary metabolite compounds found on leaves and stems with a maseration method soaked in 96% ethanol solvent and methanol for 5 days. The ethanol extract and methanol extract on each leaf and stem were then analyzed using chemical reagents to identify the alkaloid compounds, saponins, tanins and flavonoids. The results of phytochemical screening showed that in the ethanol extract and methanol the stem of the Paederia foetida contained alkaloids, saponins, tanins and flavonoids. While on ethanol extract and methanol leaves Paederia foetida contains alkaloids, tanins and flavonoids. Furthermore, the secondary metabolite compounds are analyzed biological activity.Keywords: Analysis of secondary metabolite compounds, ethanol extract and methanol leaves and stirring stem (Paederia foetida), maceration
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Ginting, Haider Ali, Johnly Alfreds Rorong, and Audy D. Wuntu. "Efek Ekstrak Limbah Cair Empulur Batang Sagu Baruk (Arenga microcarpha) Terhadap Fotoreduksi Besi(III)." Jurnal MIPA 5, no. 1 (February 8, 2016): 44. http://dx.doi.org/10.35799/jm.5.1.2016.12285.

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Telah dilakukan penelitian untuk menganalisis kandungan fenolik, flavonoid, dan tanin dari limbah cair empulur batang sagu baruk dan menguji kemampuanya dalam fotoreduksi Fe3+. Empulur batang sagu baruk diekstrak dengan pelarut akuades secara maserasi selama 2 jam. Selanjutnya ekstrak hasil maserasi dianalisis kandungan fitokimia fenolik, flavonoid dan tanin dengan menggunakan spektrofotometer UV-Vis. Pengujian fotoreduksi dilakukan pada cahaya fluorescent dengan konsentrasi 1000 mg/L selama 5 jam dengan variasi pH 4, 5, 6, 7 dan 8 serta kapasitas daya 42, 62 dan 104 Watt. Analisis ekstrak limbah cair empulur batang sagu baruk menunjukkan konsentrasi fenolik 112,04 mg asam galat/L konsentrasi flavonoid 30,10 mg kuersetin/L dan konsentrasi tanin 22,02 mg katekin/L.Hasil penelitian menunjukkan bahwa ekstrak limbah cair empulur batang sagu baruk pada pH 6 dengan kapasitas daya 104 Watt mempunyai kemampuan yang paling baik untuk mereduksi Fe3+ dibandingkan dengan ekstrak lainya.Research had been carried out to analyze the photochemicals phenolic, flavonoids, and tanins in liquid waste of pith trunk sago baruk and to test its ability in photoreduction. Pith trunk extracted with aquadest in maceration for two hours. The extracts resulted were then analyzed for phenolic, flavonoids and tanins phytochemicals using spectrophotometer UV-Vis. The photoreduction tests performed on fluorescent light with concentration of 1000 mg/L for five hours with variation pH 4, 5, 6, 7 and 8 and on energy capacities of 42, 62 dan 104 Watt. Analysis of liquid waste of pith trunk sago baruk extract showed that phenolic concentration was 112,04 mg gallic acid/L, flavonoid concentration was 30,10 mg quersetin/L and tannin concentration was 22,02 mg chatechin/L. The results showed that extract liquid waste pith trunk sago baruk at pH 6 with energy capacities 104 Watt had best ability in photoreduction Fe3+.
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Lubis, Rosliana. "Skrining Fitokimia Dan Aktivitas Antimikroba Dari Tumbuhan Bangun-Bangun (Coleus Amboinicus Lour)." Talenta Conference Series: Science and Technology (ST) 2, no. 1 (January 30, 2019): 92–96. http://dx.doi.org/10.32734/st.v2i1.322.

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Penelitian ini bertujuan untuk mengekstraksi, skrining fitokimia, dan analisa aktivitas mikroba dari daun bangun-bangun dengan menggunakan pelarut etil asetat 70% dan n-heksan. Metode ekstraksi menggunakan metode maserasi. Komposisi kimia senyawa aktif yang diuji terdiri dari alkaloid, flavonoid, terpenoid, tanin, dan saponin. Aktivtias antimikroba ekstrak etil asetat 70% dilakukan menggunakan metode pengukuran luas zona hambat. Bakteri uji yang digunakan terdiri dari E. Coli ATCC 25922 dan Pseudomonas aeruginos. Uji aktivitas bakteri dilakukan bersifat invitro. Pengukuran zona hambat menggunakan variasi konsentrasi ekstrak etil asetat 70% terdiri dari 0%, 15%, 30%, 45%, 60%, dan 75% (v/v). Hasil Penelitian :menunjukkan bahwa ekstrak etil asetat 70% daun Handeuleum secara kualitatif teridentifikasi memilki kandungan senyawa kimia alkaloid, Flavonoid, Terpenoid, Steroid, Tanin, dan Saponin. Aktivitas bakteri E. Coli ATCC 25922 dan Pseudomonas aeruginosa terhadap ekstrak didasarkan kepada pengukuran luas zona hambat yang terbentuk. Luas zona hambat yang terbentuk dari ekstrak etil asetat daun Handeuleum dengan range konsentrasi 0% s.d 75 % terdiri dari 9,50 mm – 21,2 mm dan 9,00 mm – 20,6 mm. This study aimed to extract, phytochemically screen, and analyze the microbial activity of bangun-bangun leaves using 70% ethyl acetate and n-hexane solvents. The extraction method used was maceration method. The chemical composition of the active compounds tested consisted of alkaloids, flavonoids, terpenoids, tannins, and saponins. The antimicrobial activity of 70% ethyl acetate extract was carried out using the method of measuring the inhibitory zone. The bacteria used consisted of E. coli ATCC 25922 and Pseudomonas aeruginos. The bacterial activity test was in vitro. Measurements of inhibitory zones using variations in the concentration of 70% ethyl acetate extract consisted of 0%, 15%, 30%, 45%, 60% and 75% (v / v). The results showed that 70% of the ethyl acetate extract of Handeuleum leaves were qualitatively identified as containing alkaloid chemical compounds, Flavonoids, Terpenoids, Steroids, Tanins, and Saponins. The activities of E. coli bacteria ATCC 25922 and Pseudomonas aeruginosa towards the extracts were based on measurements of the area of ​​inhibition zone formed. The area of ​​inhibition zone formed from the ethyl acetate extract of Handeuleum leaves were with a concentration range of 0% to 75% consisting of 9.50 mm - 21.2 mm and 9.00 mm - 20.6 mm.
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Zhen, Lili, Heiko Lange, and Claudia Crestini. "An Analytical Toolbox for Fast and Straightforward Structural Characterisation of Commercially Available Tannins." Molecules 26, no. 9 (April 26, 2021): 2532. http://dx.doi.org/10.3390/molecules26092532.

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Both condensed and hydrolysable tannins represent versatile natural polyphenolic structures exhibiting a broad range of activities that could be exploited in various fields including nutraceutics, cosmesis, consumer care, household and pharmaceutical applications. Various tannins are commercially available nowadays for use in such application fields. We have analysed a representative selection of commercially available condensed and hydrolysable tannins for structural features and purity. Using a combination of quantitative 31P NMR spectroscopy, HSQC measurements, MALDI-ToF analyses, gel permeation chromatography and wet chemical analysis, detailed structural characterisations and descriptions were possible, allowing for verification and falsification of claimed structural features.
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Patilaya, Popi, and Dadang Irfan Husori. "KARAKTERISTIKEKSTRAK AIR DAUN PUGUNTANO [Curanga fel-terrae (Lour.) Merr.] YANG BERPOTENSI SEBAGAI ANTELMINTIK." Jurnal Ilmiah Manuntung 1, no. 1 (January 26, 2017): 90. http://dx.doi.org/10.51352/jim.v1i1.18.

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OBJECTIVE: This study aimed to determine the characteristics of the water extract of leaves puguntano (Curanga fel-terrae (Lour.) Merr.) Using spectroscopic methods and phytochemical screening.METHODOLOGY: phytochemical screening performed to analyze compounds alkaloids, flavonoids, glycosides, anthraquinone glycosides, saponins, tannins, cyanogenic glycosides, and triterpenoids / steroids. Analyses were performed using FTIR spectrophotometer (Shimadzu) with IR Solution software. The wavelength is set at 4000 – 400 cm-1 with a resolution of 4 cm-1 and 16 scanner.RESULTS: Puguntano leaf water extract contains flavonoids, glycosides, saponins, tannins, steroids, and terpenoids. Infrared spectrum of puguntano leaf aqueous extract showed a O – H fuctional group at 3313.71 cm-1, C – H at 2974.23 and 2881.65 cm-1, C = C at 1689.65 and 1597.06 cm-1, C – O at 1265.30 and 1076.28 cm-1 and group C – H aromatics at 813.96 cm-1 in the fingerprint region
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Pinard, Jean-Luc, and Nérée St-Amand. "De la conformité au refus : analyse d’un parcours." Reflets 19, no. 1 (August 19, 2013): 85–118. http://dx.doi.org/10.7202/1018043ar.

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Dans le contexte d’une recherche menée auprès depersonnes ayant vécu des expériences en psychiatrie auNouveau-Brunswick, cet article propose une réflexion surcertaines stratégies de débrouillardiseprivilégiées par l’une d’entre elles àla suite d’un diagnostic de maladie mentale. Une grillestructurelle permettra de comprendre certains des enjeux enprésence tandis que sur le plan méthodologique,l’analyse d’un parcours permettra de mettre en valeur uneétude de cas comme illustration de possiblesréalités émergentes.
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Elgailani, Isam Eldin Hussein, and Christina Yacoub Ishak. "Determination of Tannins of Three Common Acacia Species of Sudan." Advances in Chemistry 2014 (September 17, 2014): 1–5. http://dx.doi.org/10.1155/2014/192708.

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The objective of this study is to analyze and compare tannins of three common Acacia species of Sudan, since vegetable tannins are important in leather industry. Acacia nilotica and Acacia seyal samples were collected from Sunt Forest in Khartoum State, while Acacia senegal samples were collected from the Debabat Forest in South Kordofan State. Bark samples from bulk collections of the three Acacia species were extracted with boiled deionized water. The amount of tannins present in these bulk samples was determined by Folin-Denis method for total phenolic materials, followed by precipitation with hide-powder. The difference between the amount of phenolic materials present before and after addition of hide-powder represents the amount of tannins present. The percentage of tannins in the leaves, bark, and mature and immature fruits of collections of individuals of Acacia species was estimated; mature and immature fruits of Acacia nilotica contain tannins (22.15% and 22.10%, resp.). The leaves of Acacia nilotica and Acacia seyal contain tannins (11.80% and 6.30%, resp.). The barks of Acacia seyal, Acacia nilotica, and Acacia senegal contain tannins (12.15%, 10.47%, and 3.49%, resp.).
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Díaz Carrasco, Juan María, Claudio Cabral, Leandro Martín Redondo, Natalia Daniela Pin Viso, Darío Colombatto, Marisa Diana Farber, and Mariano Enrique Fernández Miyakawa. "Impact of Chestnut and Quebracho Tannins on Rumen Microbiota of Bovines." BioMed Research International 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/9610810.

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The use of phytogenic dietary additives is being evaluated as a means to improve animal productivity. The effect of tannins seems to be the influence not only directly on the digestive process through binding of dietary proteins but also indirectly over their effects on gastrointestinal microbiota. High-throughput sequencing of 16S rRNA gene was used to analyze the impact of dietary supplementation with a blend of chestnut and quebracho tannins on the rumen microbiota of Holstein steers. Bacterial richness was lower in tannins treated animals, while the overall population structure of rumen microbiota was not significantly disturbed by tannins. The ratio of the phyla Firmicutes and Bacteroidetes, a parameter associated with energy harvesting function, was increased in tannins supplemented animals, essentially due to the selective growth of Ruminococcaceae over members of genusPrevotella. Fibrolytic, amylolytic, and ureolytic bacterial communities in the rumen were altered by tannins, while methanogenic archaea were reduced. Furthermore, ruminal pH was significantly higher in animals supplemented with tannins than in the control group, while urease activity exhibited the opposite pattern. Further work is necessary to assess the relation between tannins impact on rumen microbiota and alteration of rumen fermentation parameters associated with bovine performance.
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Dissertations / Theses on the topic "Tanins – Analyse"

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Contreras-Dominguez, Monica. "Dégradation de tanins condensés par des champignons filamenteux : analyse structurelle et enzymatique." Aix-Marseille 1, 2007. http://www.theses.fr/2007AIX11035.

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Les tanins condensés (TC) sont présents dans de nombreux produits agro-industriels et sont connus pour leurs propriétés anti-nutritionnelles. Ces propriétés peuvent être modulées par des enzymes fongiques. Après criblage, Aspergillus fumigatus MC8 a été retenue pour sa capacité à croître et dégrader 30 % des procyanidines de pomme purifiés qui possèdent un degré de polymérisation moyen de 8 (DP). Le DP augmente de 8 à 15 au cours de la fermentation, coincidant avec une diminution des oligomères de procyanidine. Le pool enzymatique extracellulaire d'Aspergillus fumigatus est capable de dégrader deux dimères, la procyanidine B2 et la procyanidine B1 à un pH entre 6 et 8. Le produit de dégradation principal de la PB2 (PB2-X) a un temps de rétension de 10,5 minutes et une masse m/z de 609. La chromatographie haute pression couplée à la spectrométrie de masse (HPLC/MSn) a permis d'étudier la structure de PB2-X. Egalement, une analyse structurelle de PB2-X a été faite suite à une thiolyse acide. Douze fragments ioniques m/z 565, 547, 457, 439 (deux fragments d'ions) 421, 413, 377, 395, 351, 287 et 277 ont été complètement identifiés. Il en a été déduit qu'une oxygénase d'Aspergillus fumigatus avait modifié l'unité terminale de PB2 sans modifier l'unité d'extension. Une analyse par spectrométrie infrarouge a permis de confirmer la présence d'une lactone au niveau de l'unité terminale. Les mêmes études ont été faites sur PB1 indiquant que dans ce cas, l'unité d'extension était modifiée et non l'unité terminale. Enfin, les conditions de production et de purification de l'enzyme impliquée ont été optimisés
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Engozogho, Anris Starlin Peguy. "Etude des produits connexes de la transformation industrielle du bois d’Okoumé du Gabon : analyse et mise en œuvre de nouveaux matériaux." Thesis, Pau, 2020. http://www.theses.fr/2020PAUU3005.

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Ce travail de thèse s’est organisé autour de la valorisation des produits connexes issus de la première et de la deuxième transformation des bois du Bassin du Congo en général et de l’Aucoumea Klaineana Pierre (Okoumé) du Gabon en particulier.En effet, 85% des produits connexes issus de cette industrie, sont incinérés 24/24h à ciel ouvert, la raison étant l’absence ou les faibles voies de valorisations possibles. Notre objectif premier est de présenter des voies de valorisations capables de réduire considérablement l’incinération de ces rebus. De ce fait et pour répondre à cette première problématique, nous avons procédé dans un premier temps, par une analyse chimique des trois parties du bois (écorce, aubier, cœur), visant à mettre en évidence les différentes molécules et leurs potentiels domaines de valorisation. Les molécules principalement visées étant les polyphénols. Nous avons par la suite porté un accent particulier aux tanins condensés extraits de l’Okoumé, que nous avons caractérisé thermiquement et chimiquement. Afin d’observer leur pouvoir collant, notamment leur capacité à être utilisé comme substrat pour la mise en point d’un adhésif bio-sourcée pour l’industrie du contreplaqué et du panneau.La deuxième voie de valorisation mise en évidence, est la mise au point d’une composite bois-plastique par thermocompression sans passé par une étape d’extrusion préalable. Ce composite pourra trouver son utilisation dans la construction et l’aménagement interne
This thesis work was organized around the promotion of related products from the first and second processing of wood from the Congo Basin in general and Aucoumea Klaineana Pierre (Okoumé) from Gabon in particular.Indeed, 85% of related products from this industry are incinerated 24 hours a day in the open air, the reason being the absence or the weak ways of possible valorizations.Our primary objective is to present ways of recovery capable of considerably reducing the incineration of this waste. Therefore and to answer this first issue, we proceeded first, by a chemical analysis of the three parts of the wood (bark, sapwood, heart), aiming to highlight the different molecules and their potential areas of development. The molecules mainly targeted are polyphenols. We then focused in particular on the condensed tannins extracted from Okoumé, which we characterized thermally and chemically. To observe their stickiness, including their ability to be used as a substrate for the development of a bio-sourced adhesive for the plywood and panel industry.The second recovery method highlighted is the development of a wood-plastic composite by thermocompression without having gone through a prior extrusion step. This composite can find its use in construction and internal design
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Balas, Laurence. "Tanins catéchiques : isolement, hémisynthèse et analyse structurale par RMN 2D homo- et hétéro-nucléaire : contribution à l'étude des tanins du raisin et des vins de Bordeaux." Bordeaux 2, 1992. http://www.theses.fr/1992BOR2B003.

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Brunet, Séverine. "Analyse des mécanismes d'action antiparasitaire de plantes riches en substances polyphénoliques sur les nématodes du tube digestif des ruminants." Toulouse 3, 2008. http://thesesups.ups-tlse.fr/339/.

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Chez les petits ruminants, la maîtrise actuelle du parasitisme par des nématodes gastro-intestinaux repose sur l'emploi d'anthelminthiques de synthèse. En raison du développement de résistances à ces molécules, l'utilisation de plantes riches en tannins condensés est désormais explorée comme solution alternative aux anthelminthiques, mais le mode d'action en reste mal connu. L'objectif de cette thèse était de définir les mécanismes d'action des tannins condensés sur les larves infestantes des trichostrongles digestifs. Nous avons d'abord confirmé que la consommation d'une plante riche en tannins condensés affecte l'installation des larves chez l'hôte, puis montré que les perturbations concernent les deux étapes-clefs de l'installation des larves : le dégainement puis la pénétration dans les muqueuses. La mise en évidence de lésions ultra-structurales et des sites de fixation des tannins condensés chez les larves est venu corroborée les résultats des études fonctionnelles, suggérant un mécanisme d'action direct. L'analyse des principaux facteurs modulant les effets constatés a montré qu'ils sont non-spécifiques de l'espèce de nématode mais varie selon la forme des larves (engainées ou dégainées). Par ailleurs, la concentration et la nature des tannins condensés sont les deux principaux facteurs liés à la plante influençant les propriétés anthelminthiques contre les larves. Des hypothèses expliquant les interactions entre les tannins et les molécules des larves infestantes sont proposées
In small ruminants, the current control of gastrointestinal parasitism relies on the use of chemical anthelmintics. However, due to the increasing development of resistances to chemical anthelmintics, the potential use of condensed tannin-rich plants represents an alternative solution to the chemical treatments, although the mode of action remains unknown. The objective of the current work was therefore to define the mechanisms of actions of condensed tannins on the infective larvae of gastrointestinal nematodes. First, we have confirmed that the consumption of a condensed tannin-rich plant decreased the establishment of infective larvae in the host. In a second step, it has been shown that both the exsheathment and the penetration of the larvae in the host mucosae were disturbed after contact with condensed tannins. The observations of the ultra-structural modifications and the fixation of condensed tannins on the larvae have confirmed a direct mode of action. In addition, our results have shown that the effects of condensed tannins were non specific of the nematode species but that differences in susceptibility exist between the ensheathed and exsheathed larvae. The effects were also dependent of the concentration and the biochemical nature of the condensed tannins. Finally, hypotheses on the potential interactions at the molecular level between the condensed tannins and the infective larvae are suggested
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Garcia, Renaud. "Développement de résines thermodurcissables et de haute performance à base de tannins : une étude fondamentale." Nancy 1, 1998. http://www.theses.fr/1998NAN10136.

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L’objectif de ce travail était de caractériser par analyse mécanique dynamique (DMA) et résonance paramagnétique électronique (RPE) les réactions de polycondensation et le comportement mécanique d'adhésifs à base de tannins (pin, pécan, quebracho naturel ou fintan) en présence, ou non, de bois et en présence de différents durcisseurs (silice, formaldéhyde, hexamine, urée, diisocyanate alcool furfurylique et leurs mélanges). Dans un premier temps, nous avons cherché à approcher les mécanismes de la polycondensation de résines à base de tannins en présence de bois par DMA. Ces adhésifs naturels comportant différents noyaux phénoliques, nous avons étudié la polycondensation de systèmes modèles à base de formaldéhyde : adhésifs phénol-formaldéhyde et produits phénoliques monomères- formaldéhyde (phénol, pyrogallol, catéchol, phloroglucinol et résorcinol). L’étude du séchage de polymères non réticulables (PEG, amidon, CMC et colle vinylique) a permis d'interpréter les résultats obtenus avec les adhésifs phénoliques synthétiques ou naturels. La DMA en flexion trois points permet en effet de suivre l'évolution des macromolécules d'adhésif en présence de bois : développement linéaire puis tridimensionnel. La DMA permet de déterminer la température de formation du réseau d'enchevêtrement (forces secondaires), la température du début de la formation d'un réseau tridimensionnel (liaisons covalentes), ainsi que la température de gélification de la résine employée et la densité moyenne du réseau final obtenu. Nous nous sommes ensuite intéressés à l'autocondensation naturelle des tannins. La résonance paramagnétique électronique nous a permis de suivre la partie radicalaire de cette réaction, de mesurer le rôle de la réaction radicalaire d'autocondensation par rapport au mécanisme ionique, et d'évaluer l'influence d'additifs sur la partie radicalaire de la réaction de condensation des tannins.
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6

Prieur-Delorme, Corinne. "Caractérisation chimique des procyanidols de pépins de raisin "Vitis vinifer" : Applications à l'étude des propriétés organoleptiques des vins." Montpellier 2, 1994. http://www.theses.fr/1994MON20209.

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Dans le but d'etablir une relation entre la structure des tanins et leurs proprietes organoleptiques, 5 fractions de procyanidines de pepins de raisin vitis vinifera ont ete isolees. La mise au point d'une methode de thiolyse adaptee a l'analyse des tanins condenses a permis de verifier la validite de notre technique de separation et de preciser la composition des fractions. L'influence du degre de polymerisation et du pourcentage d'unites galloylees sur la capacite d'interaction de ces tanins avec les proteines a ete confirmee. Dans une etude plus generale, l'astringence des vins rouges, determinee par des tests organoleptiques, a ete reliee a leur composition phenolique
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7

Mirabel, Marie. "Caractéristiques chimiques et organoleptiques des tanins des raisins de Vitis vinifera var. Merlot et Cabernet Sauvignon issus de différents terroirs bordelais." Bordeaux 2, 2000. http://www.theses.fr/2000BOR20794.

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Les tanins jouent un rôle important en œnologie, responsables de la couleur et de la saveur des vins rouges, leur structure chimique est relativement complexe. Nous l'avons étudiée grâce à différentes techniques d'analyse : la thiolyse, la GPC, la CLHP et la RMN. Pour ce faire, nous avons réalisé des étalons de tanins de poids moléculaires distincts, grâce à une précipitation au méthanol/chloroforme. L'application de la thiolyse et de la CLHP en phase normale à l'étude de la composition tannique des raisins (pépins et pellicules) au cours de leur maturation a mis en évidence des phénomènes complexes lors du millésime 1999 sur les terroirs bordelais : diminution des teneurs en tanins de pépins, parallèlement à une polymérisation des tanins ; accumulation des tanins dans les pellicules avec des modifications de structures. L'analyse sensorielle de solutions aqueuses de tanins issus de raisins et de vins nous a permis de définir leur astringence et leur amertume. Ces deux saveurs varient distinctement avec la concentration et la taille des tanins. Nous proposons un nouveau modèle de comportement gustatif des tanins selon leur taille, qui diffère de celui établi par Lea en 1992. Une corrélation entre les teneurs en polyphénols et tanins d'une part et l'astringence des extraits, d'autre part a été trouvée. Dans une moindre mesure, la teneur en tanins est corrélée à l'amertume. Cependant, ces corrélations n'ont pas été observées dans le cas du vin.
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Bikoro, Bi Athomo Arsène. "Analyse et valorisation des coproduits de la transformation industrielle de l’Acajou du Gabon (Khaya ivorensis A. Chev)." Thesis, Pau, 2020. http://www.theses.fr/2020PAUU3001.

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Au Gabon, la forêt recouvre plus de 85% du territoire soit environ 22 millions d’hectares de forêt ce qui représente un potentiel de plus de 400 millions de m3 de bois exploitables. Pour plus de 400 essences répertoriées exploitables, environ 80 sont exploitées, mais seules 13 font l’objet d’une exploitation à l’échelle industrielle. Le bois massif issu de l’exploitation forestière sous forme de grumes était, jusqu’à 2009, principalement destiné à l’exportation. Cependant depuis cette date, l’Etat Gabonais a décidé de développer son industrie, en imposant aux exploitants forestiers d’effectuer au minimum une première transformation dans le pays.Cette, réforme a conduit à l'augmentation de la transformation locale des grumes, et par conséquent à une hausse de la production de co-produits. Ces derniers représentent environ 50% de la masse initiale des grumes en ce qui concerne le sciage et environ 5% pour le déroulage. Les acteurs de la filière doivent actuellement faire face à une nouvelle problématique : un excès de produits connexes générés par la transformation locale du bois.Cette thèse a ainsi pour objectif général de proposer une démarche permettant de trouver des solutions de valorisation de ces co-produits, dont 85% sont actuellement brulés à ciel ouvert. Les co-produits de la transformation industrielle de l’acajou (Khaya ivorensis A. Chev) du Gabon ont été ainsi étudiés en trois phases. Un premier travail a été réalisé sur la caractérisation physico-chimique des extraits d’écorce, d’aubier et de bois de cœur d’acajou. Nous avons particulièrement travaillé sur les extraits phénoliques, dont les tanins. Ensuite, une voie de valorisation de ces composés a été étudiée : l’élaboration d’un adhésif à base de tanins d’acajou. Enfin, une autre piste de valorisation a été explorée : la mise au point d’un composite bois/plastique avec les co-produits de bois et les déchets issus de bouteilles plastiques.Les résultats des différents travaux effectués ont montré que les tanins d’acajou étaient riches en monomères de fisitinidine et de gallocatéchine. L’absence d’acide gallique sous forme libre a aussi été constatée. Par ailleurs, les colles à base de tanins d’acajou ont montré de bonnes caractéristiques thermiques. Enfin, le composite fabriqué a présenté des propriétés physico-mécaniques intéressantes qui permettent d’envisager une valorisation à plus grande échelle
The Gabon forest covers more than 85% of country, so about 22 million hectares of forest, which represents a potential of more than 400 million m3 of exploitable wood. For more than 400 species listed as exploitable, about 80 are exploitable, but only 13 are exploited on an industrial scale. Solid wood from logging in the form of logs was, until 2009, mainly intended for export. However, since that date, the Gabonese State has decided to develop its industry by requiring loggers to carry out at least a first transformation in the country.This reform has led to an increase in local transformation of logs, and therefore an increase in the production of co-products. The latter represent approximately 50% of initial log mass for sawing and around 5% for peeling. The actors of the sectors thus found themselves with the problem of an excess of products derived from the local processing of wood.General objective of this thesis is to propose an approach that makes it possible to find recovery solutions for these by-products, 85% of which are burnt in the open air.Co-products of the industrial transformation of mahogany (Khaya ivorensis A. Chev) from Gabon were thus studied in three phases. Initial work on the physicochemical characterization of bark, sapwood and heartwood of mahogany extracts has been carried out in general. We have particularly work on phenolic extracts, including tannins. Then, a way of valuing these compounds was studied: development of a tannin-based adhesive with mahogany tannins. Finally, another recovery avenue was explored: development of wood/ plastic composite with wood by-products and waste from plastic bottles.Results of various studies have shown that the mahogany tannins are rich in fisitinidin and gallocatechin monomers. The absence of free form of gallic acid was also noted. In addition, tannin-based adhesives of mahogany have shown good thermal characteristics. Furthermore, the composite has interesting physico-mechanical properties that would allow a possible valorization on a large scale
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9

Miramont, Clément. "Appréciation des tanins, de la couleur et de l'astringence des raisins, moûts et vins par technologies analytiques IRTF et UV-visible couplées à l’analyse de régression multivariée." Thesis, Bordeaux, 2021. http://www.theses.fr/2021BORD0091.

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L'appréciation analytique rapide (quantitative et qualitative) des composés phénoliques des raisins, des moûts et des vins rouges et leur incidence organoleptique (astringence, amertume) apparaît être un challenge en œnologie. Plusieurs méthodes analytiques ont été développées dans cette optique, mais elles nécessitent du matériel, du temps et des connaissances qui ne permettent pas de les appliquer efficacement en routine dans le milieu industriel. Pour optimiser la production des vins rouges en lien avec les concentrations et compositions en anthocyanes et en tanins, nous avons développé des modèles de prédiction fiables grâce à l’IRTF et l’UV-visible couplés à l'analyse de régression multivariée PLS.Afin de répondre à ces attentes, un ensemble d'échantillons représentatifs de la maturité du raisin, de la fermentation alcoolique, de l'élevage en barriques ainsi que des vins commerciaux ont été collectés. Ces échantillons ont été analysés grâce à différentes méthodes décrite dans la littérature, par réaction chimique ou par analyse CLHP-UV-visible, afin d'obtenir la composition et la concentration en flavan-3-ols, la concentration et la composition en anthocyanes, la composition en pigments monomériques et polymériques ainsi que la concentration en tanins totaux, précipitables l’albumine de sérum bovin et la méthylcellulose. Une sélection de vins a également été testée par un panel de dégustateurs entraînés afin de déterminer un indice d’astringence et d'amertume, avec enregistrement des spectres IRTF et UV-visible de ces échantillons.La corrélation entre les analyses spectrales et les différentes informations analytiques obtenues ont été recherchés grâce à l'analyse de régression multivariée PLS, dans le but de concevoir des modèles de prédiction. Les différentes modélisations ont ensuite été testées grâce à une validation croisée, et une validation avec un jeu d'échantillons externes à la calibration.Les résultats obtenus démontrent l'intérêt de l’IRTF et de l’UV-visible couplés à l'analyse de régression PLS pour prédire efficacement les concentrations et compositions en anthocyanes et en tanins des raisins, moûts et vins. Il apparaît que l’UV-visible et plus adapté à la modélisation des concentrations globales, alors que l’IRTF montre un fort potentiel pour une caractérisation plus approfondie de la composition moléculaire. De plus, l’addition à l’IRTF de longueurs d'onde du visible spécifiques a permis d'augmenter la robustesse des modèles pour la prédiction de l'évolution des anthocyanes. Pour la sensation d’astringence, de bons résultats préliminaires ont été obtenus pour l’IRTF et l’UV-visible. L’amertume, en revanche, s’est avéré être une perception trop complexe pour être modélisée.Les limites de prédiction des deux méthodes spectroscopiques ont aussi pu être discutées, notamment la forte variabilité induite par les différents millésimes étudiés qui peut fortement impacter les résultats de prédiction et doit être prise en compte, ainsi que la surinterprétation de résultats prédictifs pour les concentrations en anthocyanes moléculaires qui peuvent amener à questionner certaines modélisations présentes dans la littérature.Nos travaux permettent de mieux appréhender les avantages et les limites de l’IRTF et l’UV-visible couplés à l'analyse de régression PLS pour le dosage des anthocyanes et tanins des raisins, moûts et vins. La possibilité de modéliser grâce à une analyse spectrale une perception telle que l’astringence de façon innovante a aussi été étudiée pour la première fois. L’ensemble des résultats obtenus ont permis d'approfondir les connaissances actuelles sur le sujet et de développer de nouveaux modèles de prédiction fiables, efficaces et transférables pour un usage industriel dans le domaine de la vigne et du vin
The rapid analytical appreciation (quantitative and qualitative) of the phenolic compounds of grapes, musts and red wines and their organoleptic incidence (astringency, bitterness) appears to be a challenge in oenology. Several analytical methods have been developed, but they require equipment, time and knowledge which do not allow them to be applied effectively in routine for industrial environment. To optimize the production of red wines in relation to anthocyanins and tannins concentrations and compositions, we have developed reliable prediction models for FTIR and UV-visible with PLS multivariate regression analysis.In order to obtain these expectations, a set of representative samples from grapes maturity, alcoholic fermentation, aging in barrels and commercial wines were collected. These samples were analyzed using different methods described in the literature, by chemical reaction or by HPLC-UV-visible analysis, in order to obtain the composition and concentration of flavan-3-ols, concentration and composition of anthocyanins, composition of monomeric and polymeric pigments and concentration of total tannins, bovine serum albumin and methylcellulose precipitable tannins. A selection of wines was also tested by a panel of trained tasters to determine an astringency and bitterness index, with FTIR and UV-visible spectra recording of these samples.Correlation between spectral analyzes and the various analytical information obtained were sought with PLS multivariate regression analysis, for designing prediction models. The different models were tested with cross validation, and validation with an external set of samples to the calibration.The results obtained demonstrate the interest of FTIR and UV-visible with PLS multivariate regression analysis to effectively predict anthocyanins and tannins concentrations and compositions in grapes, musts and wines. It appears that UV-visible is more suited to modeling global concentrations, while FTIR shows great potential for the characterization of molecular composition. The addition of specific visible wavelengths to FTIR has increased model robustness for predicting anthocyanin evolution. For astringency sensation, good preliminary results were obtained for FTIR and UV-visible. Bitterness turned out to be a too complex perception to be modelized.Prediction limits of the two spectroscopic methods were also discussed, especially the strong variability induced by different vintages studied who can strongly impact the prediction results and should not be overlooked, as well as the overinterpretation of predictive results for molecular anthocyanin concentrations may lead to questioning some models in the literature.Our work provides better understanding of the FTIR and UV-visible advantages and limits with PLS multivariate regression analysis for determination of anthocyanins and tannins in grapes, musts and wines. The possibility of modeling a perception such as astringency in an innovative way using spectral analysis was also investigated for the first time. All the results obtained have deepen the current knowledge on the subject and they allowed to develop new reliable and efficient prediction models, transferable for industrial use in the vine and wine sector
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Saad, Ahmad. "Les tannins du vins et les lipides de la bouche et du bol alimentaire : vers une modification des marqueurs du goût. Une approche moléculaire et sensorielle." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0879/document.

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Les tannins sont des polymères de polyphénols présents en quantité significative dans le vin rouge, et responsables de l’astringence et de l’amertume. L’astringence est une sensation de sècheresse et de rugosité en bouche résultant d’une forte interaction entre les tannins et les protéines de la salive impliquées dans la lubrification de la cavité buccale. L’amertume, quant à elle, est un goût stricto sensu résultant de l’interaction spécifique des tannins avec les récepteurs du goût situés dans les papilles linguales. Des études récentes ont montré que les tannins sont susceptibles d’interagir avec les lipides. Or les lipides sont présents lors de la dégustation d’un vin comme composants des membranes buccales ou des aliments gras. Cependant, le rôle des lipides dans les perceptions sensorielles d’un vin n’est pas bien connu d’un point de vue œnologique. L’objectif de cette thèse était d’étudier au niveau moléculaire les interactions tannin-lipide, pour mieux comprendre leur rôle dans les propriétés gustatives du vin. Le présent travail décrit l’effet de deux entités représentatives des tannins du vin : un monomère, la catéchine, et un dimère, la procyanidine B1, sur deux modèles lipidiques. Le premier modèle est un modèle membranaire représenté par des vésicules multilamellaires composées de POPC/Cholestérol (70/30), qui mime la composition lipidique des membranes buccales. Le deuxième modèle est une émulsion huile dans l’eau (H/E) stabilisée par le DMPC, qui mime les gouttelettes lipidiques présentes dans les aliments gras. L’organisation et la dynamique des lipides composant ces deux modèles ont été étudiées par la spectroscopie RMN (1H, 2H, 13C) en présence et en absence des deux entités de tannins. Leur localisation dans les membranes lipidiques a également été explorée, de même que leur affinité pour les lipides avec la détermination des constantes d’association tannin-lipide. Les résultats ont mis en évidence un effet fluidifiant des tannins à la fois sur le modèle de membranes buccales et sur le modèle de gouttelettes lipidiques. On a démontré que cet effet de désordre est lié à la nature chimique des tannins, ainsi qu’à leur position dans la membrane. De plus, les résultats sur l’affinité tannin-lipide sont en faveur d’une compétition avec les protéines salivaires. En outre, les résultats de biophysique se sont avérés conformes avec ceux d’une analyse sensorielle menée en parallèle qui a révélé que les aliments gras sont susceptibles de diminuer l’astringence du vin. Ces travaux montrent l’impact des composés phénoliques sur l’ordre membranaire et soulignent pour la première fois un rôle potentiel des lipides sur le goût du vin. D’une part, les interactions tannin-lipide, en perturbant l’environnement lipidique des récepteurs du goût enchâssés dans les membranes buccales, pourraient affecter la fonctionnalité du récepteur et son interaction avec les tannins, et donc l’amertume. D’autre part, une éventuelle compétition entre les interactions tannin-lipide et tannin-protéine de la salive pourrait diminuer l’astringence durant la dégustation d’un vin. Dans le domaine de l’œnologie, cette thèse vient étayer le ressenti des dégustateurs à savoir la modification du goût du vin due aux aliments et ouvre de nouvelles perspectives dans le cadre de l’association mets-vins
Tannins are polyphenol polymers present in significant amounts in red wine responsible for astringency and bitterness. The former is a tactile perception involving dryness and roughness in the mouth due to the interaction between tannins and saliva proteins and the latter is a primary taste due to the interaction between tannins and taste receptors in taste buds. Tannins are now known to also interact with lipids. Although not present in wine, lipids are yet present during tasting in the oral membranes of tasters and in fatty foods when wine is consumed during a meal. However, although the influence of lipids is well known to wine tasters through food pairing, there is no scientific evidence to support this hedonic feeling. The aim of the thesis is to study tannin-lipid interactions at molecular level in order to better understand their implication in wine gustative properties. The present work describes the effect of the main representative grape tannin subunits, the catechin monomer and the B1 dimer, both on a model of oral membranes and food fat globules. They are represented by a dispersion of POPC/cholesterol multilamellar vesicles and a olive oil in water emulsion stabilized by DMPC as emulsifier, respectively. The organization and dynamics of the lipids composing these two models were investigated by solid-state NMR spectroscopy (1H, 2H, and 13C) in the absence and the presence of the two tannin subunits. The affinity of tannins for lipids was also explored by the determination of the thermodynamic association constant. The results pointed out a fluidizing effect of tannins both on the membrane model, as previously shown on a simpler membrane model, and on the emulsion lipid droplets. The disorder caused by tannins was shown to be related to their location in the lipid structure depending on the tannin chemical nature. Moreover, the strength of the interaction between tannins and membrane lipids was revealed to be in the same order of magnitude of that between tannins and saliva proteins. In addition, the biophysical results were in accordance with those of a sensory analysis led in parallel that revealed that fatty foods are prone to decrease wine astringency. These pioneering works shows the impact of phenolic compound on membrane order and highlight for the first time the potential role of the tannin-lipid interactions on wine taste. On the one hand, by disrupting the lipid environment of taste receptors embedded in oral membranes, tannin-lipid interactions could affect the receptor functionnality and therefore the interaction with tannin molecules, so bitterness. On the other hand, the existence of a possible competition between lipids and saliva proteins for interacting with tannins during tasting could reduce astringency
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Books on the topic "Tanins – Analyse"

1

Suharta, I. Wayan. Gending tangis palegongan, sebuah analisa struktur: Laporan penelitian. [Denpasar: Sekolah Tinggi Seni Indonesia, 1996.

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Lollar, Robert M. Field investigation and evaluation of land treating tannery sludges. Ada, OK: U.S. Environmental Protection Agency, Robert S. Kerr Environmental Research Laboratory, 1986.

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Lollar, Robert M. Field investigation and evaluation of land treating tannery sludges. Ada, OK: U.S. Environmental Protection Agency, Robert S. Kerr Environmental Research Laboratory, 1986.

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Ko, William L. Thermocryogenic buckling and stress analyses of a partially filled cryogenic tank subjected to cylindrical strip heating. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1994.

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Ko, William L. Thermocryogenic buckling and stress analyses of a partially filled cryogenic tank subjected to cylindrical strip heating. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1994.

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Ahmad, Rafiq. Analysis of stress concentration in the Dutton groove regions of the super lightweight external tank. MSFC, Ala: National Aeronautics and Space Administration, George C. Marshall Space Flight Center, 1995.

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Ahmed, Rafiq. Analysis of stress concentration in the Dutton groove regions of the super lightweight external tank. MSFC, Ala: National Aeronautics and Space Administration, George C. Marshall Space Flight Center, 1995.

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Golubkina, Nadezhda, Elena Kekina, Anna Molchanova, and Sergey Nadezhkin. Antioxidants of plants and methods of their definition. ru: INFRA-M Academic Publishing LLC., 2020. http://dx.doi.org/10.12737/1045420.

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The monograph presents the most simple and widely used methods for determining the most important of plant antioxidants: vitamin C, polyphenols, carotenoids, capsaicin, and belinovich photosynthetic pigments, flavonoids, anthocyanins, alkaloids, tannins, and minerals antioxidant: selenium and iodine. Special attention is paid to methods of extraction of antioxidants, providing maximum extraction of antioxidants from plant material, and the correct selection of the most appropriate method of analysis of one or another component. Provides detailed information developed by the authors method of using thin layer chromatography to assess the carotenoid composition of tomatoes and peppers. The data presented here include results of research conducted on the basis of FICO, as well as the latest developments of foreign scientists devoted to natural antioxidants and methods of their determination. Presented in this monograph methodology was successfully tested in the laboratory and analytical Department of PNCO in 2012-2018. For students and teachers and all interested in horticulture and agriculture.
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Melerski, Edmund S. Design analysis of beams, circular plates and cylindrical tanks on elastic foundations: With IBM-compatible software. Rotterdam: Balkema, 2000.

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Design analysis of beams, circular plates and cylindral tanks on elastic foundations. 2nd ed. London: Taylor & Francis, 2006.

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Book chapters on the topic "Tanins – Analyse"

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Dykes, Linda. "Tannin Analysis in Sorghum Grains." In Methods in Molecular Biology, 109–20. New York, NY: Springer New York, 2019. http://dx.doi.org/10.1007/978-1-4939-9039-9_8.

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Mattice, Wayne L. "Conformational Analysis of Oligomeric Proanthocyanidins." In Chemistry and Significance of Condensed Tannins, 119–30. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-7511-1_7.

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Tobiason, Fred L., and Lori A. Hoff. "MNDO Molecular Orbital Analyses of Models for Proanthocyanidin-Methylolphenol Reactions." In Chemistry and Significance of Condensed Tannins, 205–26. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-7511-1_13.

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Ferreira, Daneel, and E. Vincent Brandt. "New NMR Experiments Applicable to Structure and Conformation Analysis." In Chemistry and Significance of Condensed Tannins, 153–73. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-7511-1_10.

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McGraw, G. Wayne, Timothy G. Rials, Jan P. Steynberg, and Richard W. Hemingway. "Chemistry of Pecan Tannins and Analysis of Cure of Pecan Tannin-Based Cold-Setting Adhesives with a DMA ‘Micro-Beam’ Test." In Plant Polyphenols, 979–90. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3476-1_59.

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Amarowicz, R., and R. B. Pegg. "CHAPTER 2. Leguminous Seeds as a Source of Phenolic Acids, Condensed Tannins, and Lignans." In Food Chemistry, Function and Analysis, 19–48. Cambridge: Royal Society of Chemistry, 2019. http://dx.doi.org/10.1039/9781788015721-00019.

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Fulcrand, Hélène, Sylvain Guyot, Erwan Le Roux, Sophie Remy, Jean-Marc Souquet, Thierry Doco, and Véronique Cheynier. "Electrospray Contribution to Structural Analysis of Condensed Tannin Oligomers and Polymers." In Plant Polyphenols 2, 223–44. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4139-4_12.

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Brandt, E. Vincent, Jan P. Steynberg, and Daneel Ferreira. "Conformational Analysis of 4-Arylflavan-3-Ols As Models for C-Ring Isomerized Condensed Tannins." In Plant Polyphenols, 487–99. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3476-1_28.

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Gupta, Arvind. "India’s Strategic Think Tank: The Institute for Defense Studies and Analyses." In Think Tanks, Foreign Policy and the Emerging Powers, 199–217. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-60312-4_12.

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Hatano, Tsutomu, Akira Okonogi, and Takuo Okuda. "Oligomeric Hydrolyzable Tannins From Liquidambar Formosana and Spectral Analysis of the Orientation of Valoneoyl Groups in Their Molecules." In Plant Polyphenols, 195–207. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3476-1_11.

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Conference papers on the topic "Tanins – Analyse"

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Shi, Qianyu, Zhijian Wang, Hui Tang, and Qi Li. "The Effect of Hydrostatic Pressure and Thermal Load on Buckling Analysis of Large Scale Tank Roof." In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21049.

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Abstract Large scale molten salt storage tanks are widely used in the solar thermal power systems. For these tanks, buckling is a primary failure mode because of its features such as large scale, thinned wall and high temperature. Suffering high temperature condition is a major distinction between molten salt storage tanks and other water or oil tanks. High temperature can cause large thermal deformation for large scale structures which may have an effect on the safety assessment, especially on buckling assessment. Meanwhile, the hydrostatic pressure of molten salt can also cause the change of tank’s configuration. In this paper, a typical large molten salt storage tank has been studied. The critical buckling loads of the tank roof are obtained using nonlinear buckling analysis considering thermal loads and hydrostatic pressure. The results are discussed and some conclusions are proposed for engineering design.
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Zhang, Delin, Zhiping Chen, and You Li. "Fatigue Life Analysis of Storage Tanks In-Service Based on Exponential Curve Settlement Prediction Model." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84431.

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In order to study the structural fatigue safety of in-service fixed roof storage tanks after uneven settlement, an exponential curve method of settlement prediction has been constructed. A finite element model based on the contact condition between the elastic ring beam foundation and the tank base was also proposed. On the basis of above, a fatigue life prediction method of in-service storage tanks based on the settlement prediction model has been established. Combined with the engineering example of an in-service tank, the structural fatigue safety under the actual uneven settlement was analyzed. The results indicate that the trend of foundation settlement with time could be predicted accurately and the contact condition between base and foundation could be simulated simultaneously. Subsequently, the in-service tank’s structural fatigue life under the uneven settlement could be predicted.
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Kotrasová, Kamila, and Eva Kormaníková. "Dynamic analysis of liquid storage tanks." In INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2016). Author(s), 2017. http://dx.doi.org/10.1063/1.4992419.

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Griyanitasari, Gresy, Emiliana Kasmudjiastuti, Ragil Yuliatmo, and Mohammad Zainal Abidin. "Evaluation of combination tanning and natural finishing on sheep leather with Uncaria Gambir Roxb extract." In The 8th International Conference on Advanced Materials and Systems. INCDTP - Leather and Footwear Research Institute (ICPI), Bucharest, Romania, 2020. http://dx.doi.org/10.24264/icams-2020.ii.11.

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The discovery of natural local resources for tanning and coloring agents are growing dramatically to sustain a cleaner leather manufacturing technology. Gambir (Uncaria gambir Roxb) has been found potential as tannin and dyestuffs for leather and textile industry. Therefore, to explore these issues, a combination tanning and finishing system were evaluated to observe the efficiency of this extract on leather processing. A combination tanning system based on chrome or glutaraldehyde – gambir and followed by gambir as coloring agent with different concentrations (100 - 200 parts/L) have been applied. In this FTIR (Fourier-transform infrared spectroscopy) analysis of gambir extract showed the presence of phenolic hydroxyl group. Our results revealed that chrome - gambir and glutaraldehyde - gambir finished leather product with 150 parts/L of gambir extract showed excellent rub fastness, color fastness to perspiration and washing. Most of the result values obtained were generally at satisfactory levels which were between 3/4 and 5 fastness values. Visual evaluation reported that chrome-gambir finished leather product with 150 parts/L of gambir extract exhibited better uniformity of colour fastness.
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Sendrea, Claudiu, Maria-Cristina Micu, Emanuel Hadimbu, Simona Maria Paunescu, Iulia Maria Caniola, Madalina Ignat, Lucretia Miu, and Elena Badea. "Micro DSC and NMR MOUSE studies of collagen–vegetable tannin interaction mechanism during leather making." In The 8th International Conference on Advanced Materials and Systems. INCDTP - Leather and Footwear Research Institute (ICPI), Bucharest, Romania, 2020. http://dx.doi.org/10.24264/icams-2020.v.13.

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In this study NMR MOUSE and micro DSC techniques were used to investigate the interaction between collagen and various vegetable tannins during leather making process with the aim of gaining a deeper understanding of different water environment in relation to tannin type. We have previously showed that relaxation times may provide useful information on collagen matrix properties. The vegetable tanned leathers were obtained by patented techniques inspired from ancient recipes at the National R&D Institute for Textile and Leather, ICPI Division, Bucharest using various vegetable extracts such as myrobalan, gambier and chestnut. Longitudinal and transversal relaxation times T1 and T2eff were measured using a PM2 portable NMR-MOUSE with 20.05 MHz frequency. Micro DSC measurements were carried out with a high-sensitivity SETARAM Micro-DSC III in the temperature range (5 to 95) °C at 0.5 K min-1 heating rate. The investigated leathers showed significant differences in the values of spin-spin (T2eff) and spin-lattice (T1) relaxation times depending on tannin type that well corelates with the variation of the calorimetric parameters (denaturation temperature and enthalpy, peak shape). These results highlight the complementarity of the information obtained by the two techniques and open new ways for both designing new leather assortments and analyses of historical and archaeological leather.
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Tvrda, Katarina. "STATIC ANALYSIS OF CYLINDRICAL TANKS." In 20th SGEM International Multidisciplinary Scientific GeoConference Proceedings 2020. STEF92 Technology, 2020. http://dx.doi.org/10.5593/sgem2020/1.1/s02.090.

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Chub, S. K., Zh V. Daironas, and I. N. Zilfikarov. "PROBLEM OF CLASSIFICATION AND PHYSICAL AND CHEMICAL ANALYSIS OF NATURAL TANNINS." In 90 лет - от растения до лекарственного препарата: достижения и перспективы. Москва: Федеральное государственное бюджетное научное учреждение "Всероссийский научно-исследовательский институт лекарственных и ароматических растений", 2021. http://dx.doi.org/10.52101/9785870191003_2021_328.

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Bharathan, Desikan, and Greg C. Glatzmaier. "Progress in Thermal Energy Storage Modeling." In ASME 2009 3rd International Conference on Energy Sustainability collocated with the Heat Transfer and InterPACK09 Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/es2009-90119.

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Economic analyses for concentrated solar power (CSP) systems indicate that the cost of electricity can be reduced through the use a molten-salt thermal energy storage system (TES). Use of a thermocline in the tanks to keep cold and hot fluids separate in the tank has been proposed to further reduce the cost for TES to about $30/kWh thermal. This paper studies the details for molten-salt storage where the tank is filled with nominally 1-inch-size quartzite rocks and 1/4-inch sand particles. These filler materials are envisioned to occupy 75% of the tank’s volume. Experiments at Sandia National Laboratories indicate that these filler materials are compatible with the molten salt, and a well-established thermocline can be maintained in these tanks. The National Renewable Energy Laboratory attempts to look into the next level for the tank design, modeling heat transfer between solid filler and molten salt. Loose filler materials exert added hoop stresses in the tank that are likely to be unmanageable in the long run because of thermal cycling. Structured brick-like stacked shapes are needed that can maintain their structure without requiring sidewall support for the fill material. Large tanks with a volumetric capacity of 100,000 kL maintain a reasonable thermocline during charge and discharge. We report on progress in computational fluid dynamics (CFD) modeling of such tanks. However, for operational convenience for the plant, we suggest the use of multiple tanks.
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Ahuja, Vineet, Ashvin Hosangadi, Stephen Mattick, Chun Lee, Robert Field, and Harry Ryan. "Computational Analyses of Pressurization in Cryogenic Tanks." In 44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-4752.

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Feng, Wenzhuo, Zhiping Chen, Xinliang Shen, Fan Zhou, and Haigui Fan. "Optimization Analysis on the Structure Parameters of a 20×104 m3 Ultra-Large Tank for Crude Oil Storage." In ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97758.

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With the advantages of low investment, small footprint, ease of operation management etc., large-scale vertical tanks for crude oil storage have become an obvious trend. However, stress intensity of the tank wall increases with constant enlargement of oil tank’s parameters, and the yield strength of the steel used as tank wall material can not be more than 490 MPa. Besides, the maximum thickness of shell plate generally should be not over 45 mm subjected to the restriction of manufacturing process. So, it is important to design the structure of tank reasonably and reduce the stress as much as possible. This paper combines theoretical analysis and numerical simulation together, analyzing and calculating the stress of shell plate and bottom plate of an ultra-large tank for crude oil storage which is 200000 cubic meters, and comparing the stress level of three design schemes about shell plate and bottom annular plate, then giving a scheme whose stress distribution is more reasonable. The study shows that combined cylindrical shell method is applicable to the theoretical stress calculation of shell plates of ultra-large crude oil storage tanks, finite element method using contact element could simulate the stress distribution of bottom plate well, and give the optimal structure parameter scheme by controlling the hoop stress of tank wall and radial stress of bottom plate. The result of this paper has a certain practical guiding significance to the optimization design of ultra-large tanks for crude oil storage.
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Reports on the topic "Tanins – Analyse"

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Wendelberger, James G., William Richard Salazar, and Casey Charles Finstad. Accountability Tanks Calibration Data Analysis. Office of Scientific and Technical Information (OSTI), April 2017. http://dx.doi.org/10.2172/1353027.

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Schaus, P. S. Hanford Tanks Initiative mission analysis report. Office of Scientific and Technical Information (OSTI), September 1997. http://dx.doi.org/10.2172/362364.

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LEE, SI. Erosion Modeling Analysis For DWPF MFT/SME Tanks. Office of Scientific and Technical Information (OSTI), May 2004. http://dx.doi.org/10.2172/824267.

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ADAMS, M. R., and S. R. WILMARTH. Statistical Optimization Study Estimating Analyte Concentrations in Unsampled Waste Tanks. Office of Scientific and Technical Information (OSTI), July 2002. http://dx.doi.org/10.2172/807997.

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TRUITT, J. B. Parametric Analyses of Heat Removal from High Level Waste Tanks. Office of Scientific and Technical Information (OSTI), June 2000. http://dx.doi.org/10.2172/803942.

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Tang, Yu, and Y. W. Chang. Free vibration analysis of partially filled liquid storage tanks. Office of Scientific and Technical Information (OSTI), May 1993. http://dx.doi.org/10.2172/10178843.

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Wittekind, W. D., H. Toffer, and J. E. Koglin. Integral TRU measurements in Hanford waste tanks using gas analysis. Office of Scientific and Technical Information (OSTI), May 1994. http://dx.doi.org/10.2172/10156214.

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MARTINO, CHRISTOPHERJ. Tanks 3F and 2F Saltcake Core and Supernate Sample Analysis. Office of Scientific and Technical Information (OSTI), July 2004. http://dx.doi.org/10.2172/825801.

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McLaren, J. M. Ferrocyanide safety program: Thermal analysis of ferrocyanide tanks, Group I. Office of Scientific and Technical Information (OSTI), June 1994. http://dx.doi.org/10.2172/10173367.

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Wilmarth, W. R. Analyses of surface and variable depth samples from Tanks 30H and 32H. Office of Scientific and Technical Information (OSTI), July 2000. http://dx.doi.org/10.2172/758797.

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