Relevant bibliographies by topics / Vanilline

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Academic literature on the topic 'Vanilline'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 May 2024

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Journal articles on the topic "Vanilline"

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Iskandar, Damayanti, and Susy Yunita Prabawati. "Synthesis of Compounds Acetyl Vanilat as Analgesic Compound Components." Jurnal ILMU DASAR 17, no. 2 (February 1, 2017): 73. http://dx.doi.org/10.19184/jid.v17i2.2683.

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Acetyl vanillate was synthesized to become an analgesic compound was conducted in two stages.The first stage is oxidation vanillin using Tollens reagent. The result of the oxidation wascharacterized by melting point and FTIR. The second stage, vanillic acid was acetylated usingacetic acid anhydrous under two conditions, that are acid and base using H2SO4 and NaOH 10%,respectively. Two difference products from those processes were characterized using FTIR and1H-NMR. The result of the melting point vanillic acid test showed 204°C and the standard is210°C. Vanilline was successfully oxidized, based on comparison FTIR spectra between vanillineand its precursor that showed no functional group of C-H aldehyde at 2,700-2,800 cm-1. Thecharacteristics FTIR spectra under base conditions showed no absorption of functional group ‒OHthat substituted by an acetyl group. So that, the base catalyst indicated no product of the expectedcompound. The product under acidic compounds have the characteristic yellow crystals with amelting point of 130°C. Characteristics of FTIR showed no width absorption at wave number 3400cm-1 and evidenced by 1H-NMR spectra. Shift peak at 2.342 ppm was an absorption acetylcompounds. It was concluded that acetylation of acetyl vanillate compounds under acidicconditions to produce the expected product.Keywords: vanilin, vanilic acid, acetylation
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Chatonnet, Pascal, Jean-Noël Boidron, Denis Dubourdieu, and Monique Pons. "Evolution de certains composés volatils du bois de chêne au cours de son séchage premiers résultats." OENO One 28, no. 4 (December 31, 1994): 359. http://dx.doi.org/10.20870/oeno-one.1994.28.4.1720.

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<p style="text-align: justify;">Pendant le séchage des merrains sur parc à l'air libre, on assiste à une profonde modification de la composition chimique et du profil aromatique du bois de chêne. La teneur en eugénol, en aldéhydes phénols et en Β-méthyl-y-octalactone augmente régulièrement pendant le vieillissement du bois. Principalement sous forme trans au début du séchage, la Β-méthyl-y-octalactone s'accumule finalement sous la forme cis plus aromatique. Dans le même temps, on observe également une accumulation importante du précurseur inodore de Β-méthyl-y-octalactone. L'intervention des micro-organismes fréquemment isolés sur le bois en cours de séchage naturel sur la formation de composés aromatiques a été étudiée. La culture de diverses moisissures isolées de bois en cours de séchage naturel sur extraits de bois et directement sur sciure de chêne aboutit dans tous les cas à une forte diminution des teneurs en aldéhydes phénols, notamment de la vanilline. En effet, tous les micro-organismes étudiés (<em>Penicilium sp., Trichoderma sp., Aureobasidium sp.</em>) sont incapables de dégrader la lignine car ils ne possèdent pas d'activité ligninase. En revanche, ces champignons possèdent une forte activité oxydo-réductase capable de réduire la vanilline en alcool vanillique inodore. En conséquence, les aldéhydes phénols apparaissant au cours du séchage naturel du merrain ne dérivent pas d'une attaque enzymatique mais plus vraisemblablementde l'acidolyse et de l'oxydation chimique de la lignine du bois. Le stockage du bois à l'air libre en présence d'eau et d'oxygène doit permettre une évolution favorable de son potentiel aromatique tant que la vanilline et la cis Β-méthyly-octalactone s'accumulent.</p>
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Kamaal, Saima, Md Serajul Haque Faizi, Arif Ali, Musheer Ahmad, Mayank Gupta, Necmi Dege, and Turganbay Iskenderov. "Crystal structure of 4-[(2-hydroxy-3-methoxybenzyl)amino]benzoic acid hemihydrate." Acta Crystallographica Section E Crystallographic Communications 75, no. 2 (January 8, 2019): 159–62. http://dx.doi.org/10.1107/s2056989018018455.

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In the crystal of the title vanilline derivative, 2C15H15NO4·H2O, the secondary amine molecule is accompanied by half equivalent of water. The molecule is non-planar, with torsion angle Caryl—CH2—NH—Caryl of −83.9 (2)°. In the crystal, the system of O—H...O hydrogen bonds, including bridging water molecules residing on crystallographic twofold axes, results in a two-dimensional layered structure. Within the layers, there are also weak N—H...π interactions involving the vanilline benzene ring.
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Onozaki, Hiromichi, Hisaye Asai, Shinobu Isshiki, and Hideo Esaki. "Bacterial metabolism of vanillylamine and vanilline." Journal of Fermentation Technology 64, no. 5 (October 1986): 470. http://dx.doi.org/10.1016/0385-6380(86)90041-5.

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Yue, Yongkang, Fangjun Huo, Caixia Yin, Jianbin Chao, Yongbin Zhang Yongbin Zhang, and Xing Wei. "An ICT based ultraselective and sensitive fluorescent probe for detection of HClO in living cells." RSC Advances 5, no. 95 (2015): 77670–72. http://dx.doi.org/10.1039/c5ra16097a.

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An ICT based ultraselective and sensitive probe for colorimetric and fluorescent detection of HClOviaoxidative cleavage of an alkene linker to epoxide and then to aldehydes was developed through the conjugation of pyridinium with vanilline.
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Kim, Taehyeong, Heeseok Jeong, Suji Park, and Gyungmin Kim. "Anti-mold Activity of Vanillin and o-Vanillin for the Production of Anti-mold Wallpaper." Korean Science Education Society for the Gifted 15, no. 1 (April 30, 2023): 122–35. http://dx.doi.org/10.29306/jseg.2023.15.1.122.

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Molds are toxic and harmful to the human body. In this study, we intended to produce anti-mold wallpaper using easily obtained substances. First, four strains were separated and identified from actual moldy wallpaper. Next, Vanillin and o-Vanillin were both selected as anti-mold substances due to the fact that they were confirmed to have growth-inhibitory effects on the four identified strains. For all the strains, the growth inhibitory effect of o-Vanillin was higher than Vanillin. It was verified that the higher the treatment concentration of Vanillin and o-Vanillin, the higher the ROS production in all fungi, which means the anti-mold activity of Vanillin and o-Vanillin is related to the increase in ROS production. Vanillin and o-Vanillin were smeared on the wallpaper to confirm this anti-mold effect. Mold growth was suppressed in the wallpaper treated with Vanillin of 0.05M or more and o-Vanillin of 0.01M or more, but at concentrations below that, the growth of the mold did not differ significantly from the control group. The cytotoxicity of Vanillin and o-Vanillin was directly proportional to the concentration of the treated candidate substances, and the cytotoxicity of o-Vanillin was higher than that of Vanillin. Therefore, it would be appropriate to apply Vanillin of 0.05M or less for the use of anti-mold wallpaper. Based on its stronger anti-mold activity when compared to anti-mold drugs on the market, Vanillin can be used in a wide variety of places, including anti-mold sprays and paints.
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ROSU, Tudor, Angela KRIZA, Viorel CARCU, and Anca NICOLAE. "TRANSITION METAL COMPLEXES OF THE FORMYL VANILLINE DERIVATIVES LIGAND FAMILY." SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 5, no. 5 (December 20, 1997): 67–77. http://dx.doi.org/10.48141/sbjchem.v5.n5.1997.68_1997.pdf.

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Divalent 3d metal complexes with formyl-vanilline derivatives, of lite type ML2 or ML2X2 (M = Cu(II), Co(II); X = Cl), were sythesized by reaction of the corresponding metal(II) chlorides with 1-[3-formyl-4-methoxy-6-hidroxybemilydene]-2-phenazinoyllhydrazine, (FDFH), 1-benzilydene-2-phenazinoyhydrazine, (BFH), and 3-formyl-5,6-dihydroxybemilydenc-2-nitro-1--methylaniline, (FBAH). The novel complexes were characterized by ESR, IR, electronic spectroscopy, molar electric conductibility measurements and magnctk studies. These compounds appear to bn hexacoordinated.
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Kozlov, N. G., and L. I. Basalaeva. "Vanilline Alkanoates in the Synthesis of Hexahydrobenzacridine and Octahydroxanthene Derivatives." Russian Journal of General Chemistry 75, no. 4 (April 2005): 617–21. http://dx.doi.org/10.1007/s11176-005-0282-2.

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Böeseken, J., and J. Greup. "L'Oxydation de Quelques Dérivés de la Vanilline par L'acide Peracétique." Recueil des Travaux Chimiques des Pays-Bas 58, no. 6 (September 3, 2010): 528–37. http://dx.doi.org/10.1002/recl.19390580608.

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Monties, Bernard. "Composition chimique des bois de chêne: composés phénoliques, relations avec quelques propriétés physiques et chimiques susceptibles d'influencer la qualité des vins et des eaux-de-vie." OENO One 21, no. 3 (September 30, 1987): 169. http://dx.doi.org/10.20870/oeno-one.1987.21.3.1282.

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<p style="text-align: justify;">Les polyphénols du bois de chêne, extractibles et composés liés à la paroi végétale = lignines, lignanes, tanins et aldéhydes phénoliques, ont été envisagés au niveau moléculaire de leurs relations avec les propriétés physico-chimiques des bois : retrait, porosité, propriétés mécaniques.</p><p style="text-align: justify;">Des résultats originaux ont été aussi présentés concernant le fractionnement des polyphénols pariétaux, l'incrustation des parois par les tanins hydrolysables: acide ellagique associé à des fractions de lignine, ainsi que la formation d'aldéhydes phénoliques (vanilline, syringaldéhyde, aldéhydes coniférylique et sinapylique) par pyrolyse douce de la lignine. Des mécanismes réactionnels hypothétiques ont été suggérés.</p><p style="text-align: justify;">+++</p><p style="text-align: justify;">Oak wood phenolics, extractives and cell wall linked compounds : lignins, lignans, tanins and phenolic aldehydes have been discussed, at the molecular level, in their relations with physico-chemical properties of wood = shrinking, permeability and mechanical properties.</p><p style="text-align: justify;">Unpublished results have been also reported concerning fractionnation of cell wall phenolics, incrustation of cell wall by tanins: ellagic acid associated with lignins fractions and formation of phenolic aldehydes (vanillin, syringaldehyde, coniferaldehyde, sinapaldehyde) during mild pyrolysis of lignin in oak wood. Hypotherical reaction mechanism have been suggested.</p>
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Dissertations / Theses on the topic "Vanilline"

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Lambert, Fanny. "Procédés de biosynthèse de composés phénoliques dérivés de la vanilline par bioconversion d'eugénol." Thesis, Strasbourg, 2013. http://www.theses.fr/2013STRAJ116.

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La vanillyl alcool oxydase est un biocatalyseur prometteur d’un point de vue réactionnel en raison de sa faible sélectivité sur les composés phénoliques substitués en position para. Elle catalyse l’oxydation d’une large gamme de dérivés 4-hydroxybenzylique, des réactions de déméthylation oxydative, de désamination, de déshydrogénation et d’hydroxylation ; notamment celle de l’eugénol. L’hydroxylation de ce dernier conduit à la formation d’alcool coniférylique. Dans le but d’utiliser l’eugénol comme substrat de biosytnhèse de dérivés vanilliques, nous avons développé, au cours de ce travail de thèse, deux souches exprimant le biocatalyseur d’intérêt : une souche de levure et une souche bactérienne.La première partie de la thèse a donc consisté à mettre au point un système d’expression pour la production de VAO dans la levure de boulanger et un procédé d’hydroxylation de l’eugénol en fermenteur. Le principal apport réside dans la construction de la souche 93645, qui contient la cassette d’expression VAO et une activité oxydase propre permettant la bioconversion de l’alcool coniférylique formé en acide férulique. En fonction des conditions de fermentation, 20 g/l d’alcool coniférylique ou 27 g/l d’acide férulique sont produits par les cultures de S. cereviaise- VAO 93645. La reproductibilité des procédés, ainsi que leur faisabilité à l’échelle pilote, ont été démontrés.Dans la seconde partie de cette étude, le même travail de clonage a été réalisé dans la souche Amycetales Streptomyces setonii ATCC 39116. La bactérie, reclassifiée en 2009 sous le nom d’Amycolatopsis sp 39116, est connue pour sa capacité à bioconvertir l’acide férulique en vanilline ; d’où l’intérêt d’exprimer l’enzyme VAO dans cette souche. Plusieurs stratégies de clonage ont été expérimentées et une souche recombinante, exprimant une activité VAO active a été obtenue. Les conditions optimales pour l'utilisation de cette dernière dans le cadre de la production de vanilline et d’alcool coniférylique ont été identifiées. Elles conduisent à la biosynthèse de 0,4 g/l vanilline et de 15 g/l d’alcool coniférylique. Les résultats mettent en évidence une activité insuffisante des oxydases de Streptomyces sur l’alcool coniférylique formé. Ce type de production n’a encore jamais été réalisé chez S. setonii et ces premiers résultats demandent encore des mises au point avec, sans doute, le clonage d’oxydases hétérologues permettant la bioconversion de l’alcool coniférylique formé en acide férulique
Our aim was to develop a process for the biosynthesis of vanillin derivatives from eugenol.Vanillyl alcohol oxidase isolated from Peniciiiium simplissicimum, catalyzes the hydroxylation of eugenolinto coniferyl alcohol. In this study, two strains expressing the biocatalyst were constructed: a yeast,Saccharomyces cerevisiae, and a bacteria; Streptomyces setonii.It has been demonstrated that the wild strain Saccharomyces cerevisiae can bioconvert coniferyl alcohol, most probably due to its dehydrogenase activity. Strain 93645, genetically modified to expressvanillyl-alcohol oxidase, enabled us to optimize an industrial scale process for the production of natural ferulic acid.Streptomyces setonii strain ATCC 39116 was also genetically engineered to over-express VAO. Abioconversion process was developed leading to a coniferyl alcohol concentration of 15 g/1 coniferyl alcohol. The impact of several parameters; such as temperature, substrate addition mode and pH, werealso explored to improve the bioconversion reaction of coniferyl alcohol to vanillin. The amounts of product resulting from bacterial biosynthesis were however too low for implementation of an industrial process
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Rabe, Ravelona Manda. "Hydrolyse enzymatique en solution hydroalcoolique de la gousse verte de vanille en vue de l’obtention de l’arôme naturel de vanille." Compiègne, 2006. http://www.theses.fr/2006COMP1652.

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Le traitement traditionnel de vanille a pour objectifs de sécher les gousses et d'hydrolyser les précurseurs d'arômes. Les inconvénients de ce traitement sont sa durée relativement longue pouvant aller à 8 mois et le faible rendement de transformation par hydrolyse des précurseurs d'arôme. L'objectif de ce travail consiste à optimiser la production d'extrait de vanille en augmentant les teneurs en composés principaux (vanilline, acide vanillique, parahydroxybenzaldéhyde, acide parahydroxybenzoique) et en réduisant le temps d'obtention d'extrait. La méthode utilisée consiste à faire macérer des broyats de gousses vertes dans une solution hydrolacoolique en apportant des préparations sources d'activités β-glucosidase et de pectinases. Les résultats sont la baisse de la durée d'obtention d'extrait à 15 jours et l'augmentation de la teneur en vanilline à 2,7 g / 100 g de gousse traitée équivalente comparée à 1,8-2 g de vanilline obtenues selon la méthode traditionnelle
Aims of traditional procedures for curing vanilla consist of drying the bean and hydrolyzing vanilla aroma precursors. Inconvenient of those procedures is its relatively long duration being able to go in 8 months and poor yield of transformation per hydrolysis of aroma precursors. Aims of this study consist to optimize the production of vanilla extract by improving content of principal compounds (vanillin, vanillic acid, parahydroxybenzaldehyd, parahydroxybenzoic acid) and by reducing the time of obtaining extract. The method used is based on making macerate ground of green beans into hydrolalchoolic solution and by bringing enzymatic preparation source of β-glucosidase activity. Result of this study is the diminution of time procedure to 15 days for obtaining vanilla extract and increase of vanillin content to 2,7 g / 100 g of equivalent cured bean to compare with 1,8-2 g of vanillin obtained with traditional procedure
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Fache, Maxence. "Fonctionnalisation et polymérisation de dérivés phénoliques naturels : Vers des matériaux aromatiques biosourcés Vanillin, a key-intermediate of biobased polymers Vanillin, a promising biobased building-block for monomer synthesis Biobased epoxy thermosets from vanillin-derived oligomers Amine hardeners and epoxy cross-linker from aromatic renewable resources Epoxy thermosets from model mixtures of the lignin-tovanillin process." Thesis, Montpellier, Ecole nationale supérieure de chimie, 2015. http://www.theses.fr/2015ENCM0014.

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Ce travail s'inscrit dans le domaine très actif de la synthèse de polymères biosourcés. Les polymères époxy ont été choisis comme cible car ils présentent une double problématique de substitution du bisphénol A et d'utilisation de ressources renouvelables. L'objectif de ce travail est donc de préparer des polymères époxy biosourcés et d'évaluer leur potentiel en tant que substituts des solutions actuelles. Afin d'atteindre des propriétés thermo-mécaniques suffisantes, des composés naturels aromatiques doivent être utilisés. En effet, le cycle aromatique apporte rigidité et stabilité thermique au réseau. La vanilline est une des seules molécules aromatiques extraites de la biomasse qui soit disponible en quantités industrielles. Elle est obtenue par dépolymérisation en milieu basique et oxydant de lignine. Récemment, la préparation de polymères renouvelables à partir de vanilline a été intensivement explorée ; une revue sur ce sujet a été rédigée. La vanilline a servi de brique de base pour la préparation d'une plateforme de dérivés possédant des fonctionnalités variées. Des monomères diamine, diepoxy, ou dicyclocarbonate dérivés de vanilline ont – entre autres – été synthétisés. Les monomères diepoxy ont été réticulés avec un durcisseur amine commun et les polymères obtenus ont été caractérisés. Leurs propriétés thermo-mécaniques ont été reliées à la structure des monomères. Ces polymères époxy potentiellement biosourcés ont des propriétés comparables à la référence à base de bisphenol A. Afin de pouvoir moduler ces propriétés, des oligomères époxy de longueurs différentes ont été synthétisés à partir de vanilline selon la même méthode que celle utilisée industriellement. Ces oligomères et les polymères époxy qui en sont issus présentent effectivement des caractéristiques modulables. D'autres méthodes de contrôle des propriétés ont été testées, comme la préparation et la polymérisation de nouveaux durcisseurs aminés biosourcés, ou celle d'un monomère époxy trifonctionnel à partir de vanilline. Le polymère potentiellement biosourcé préparé à partir de ce dernier composé présente de meilleures propriétés que la référence à base de bisphénol A. Finalement, un travail portant plus sur la ressource a été réalisé. Des mélanges de composés phénoliques modélisant les produits obtenus lors du procédé de synthèse de vanilline à partir de lignine ont été préparés. L'utilisation de tels mélanges au lieu de la vanilline pure serait bénéfique autant économiquement qu'écologiquement. Ces mélanges ont été glycidylés, puis polymérisés, et les matériaux obtenus caractérisés. Les excellentes propriétés obtenues permettent d'envisager d'intégrer ce débouché à une bioraffinerie
The background of this work is the synthesis of bio-based polymers, a very active area of research. Epoxy thermosets were chosen as target because of the double problematic of bisphenol A substitution and of renewable resources use. Thus, the aim of this work is to prepare bio-based epoxy thermosets and to evaluate their potential as substitutes of current formulations. In order to display good thermo-mechanical properties, these polymers have to be prepared from renewable aromatics. Indeed, aromatic cycles bring rigidity and thermal stability to the network. Vanillin is one of the only aromatic molecules available from biomass at an industrial scale. It is obtained from the alkaline oxidative depolymerization of lignin. Recently, the preparation of renewable polymers from vanillin has been intensively explored; a review on this subject was compiled. Vanillin served as a building-block to prepare a platform of derivatives bearing various functions. Di-amine, di-epoxy, or di-(cyclic carbonate) monomers – among others – were synthesized. The di-epoxy monomers prepared were cross-linked with a common amine hardener and the polymers obtained were characterized. Their thermo-mechanical properties were linked to the monomers structure. These potentially bio-based epoxy thermosets have properties comparable to the bisphenol A-based reference. In order to tune these properties, vanillin-based epoxy oligomers were synthesized by the same method as the one used industrially. The properties of these oligomers and of the thermosets prepared from them could indeed be modulated. Other means of controlling the properties were tested, like the preparation and polymerization of new bio-based amine hardeners, or of a vanillin-based, tri-functional epoxy monomer. The thermoset prepared from this last compound displayed better properties than the bisphenol A-based reference. Finally, a work more centered on the resource was performed. Mixtures of phenolic compounds modelling the products of the lignin-to-vanillin process were prepared. The use of such mixtures instead of pure vanillin could be advantageous both from an economic and an ecologic point of view. These mixtures were glycidylated, polymerized, and the materials obtained were characterized. The excellent properties displayed by these materials allow a potential integration of this strategy in a bio-refinery
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Brunelliere, Jérôme. "Caractérisation des voies métaboliques d'une souche de Streptomyces impliquée dans la production de vanilline." Clermont-Ferrand 2, 2009. http://www.theses.fr/2009CLF21947.

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La souche de Streptomyces setonii ATCC 39116 est utilisée par la société Rhodia dans la production de vanilline naturelle, qui est la molécule majoritaire de l'arôme de vanille, par bioconversion de l'acide férulique. Afin d'améliorer les rendements de production, une connaissance des voies métaboliques et des mécanismes de régulation mis en jeu lors de cette bioconversion est nécessaire. Pour cela, le séquençage de son génome a été réalisé. Les voies métaboliques d'intérêt ont alors pu être reconstituées in silico. Le suivi cinétique de l'expression des gènes intervenant aux étapes cruciales de la bioconversion a permis de confirmer leur rôle et de mieux comprendre leur mécanisme de régulation. Enfin, la caractérisation fine du métabolisme de la vanilline chez cet organisme a aussi apporté les bases essentielles pour le développement d'approches d'ingéniérie métabolique susceptibles d'être utilisées pour augmenter ses capacités de production
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Odoux, Eric. "Contribution à l'étude de l'hydrolyse de la glucovanilline en vanilline dans la "gousse" du vanillier (vanilla planifolia G. Jackson)." Montpellier 2, 2004. http://www.theses.fr/2004MON20057.

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Foyer, Gabriel. "Synthèse de résines phénoliques bio-sourcées sans formaldéhyde pour l’industrie aérospatiale." Thesis, Montpellier, Ecole nationale supérieure de chimie, 2015. http://www.theses.fr/2015ENCM0021/document.

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Les résines phénoliques de type résole présentent des propriétés applicatives et thermiques adaptées à l'élaboration de matériaux composites pour l'industrie aérospatiale. En particulier, ces résines peuvent être polymérisées en plusieurs étapes et présentent des propriétés de charbonnement très élevées. Seulement, ces résines sont principalement synthétisées à partir de formaldéhyde et de phénol. Ces précurseurs sont classés Cancérigène Mutagène Reprotoxique (CMR) respectivement de catégorie 1B et 2 et sont issus de ressources pétrolières. Du fait de cette classification CMR et de la raréfaction des ressources pétrolières, la société SAFRAN-Herakles souhaite substituer le formaldéhyde par des précurseurs non classés CMR et d'origine renouvelable. Les précurseurs aldéhyde aromatiques issus des lignines, 4-hydroxybenzaldéhyde, vanilline et syringaldéhyde, ne sont pas toxiques et peuvent être issus d'une ressource renouvelable abondante et bon marché, les lignines. Néanmoins, nous avons montré que ces trois précurseurs bio-sourcés ne sont pas réactifs en synthèse de résines résole. Nous avons également montré que le formaldéhyde doit être substitué par des précurseurs dialdéhyde aromatiques réactifs pour synthétiser des résines phénoliques avec d'excellentes propriétés de charbonnement. Ainsi, nous avons mis au point deux méthodes de fonctionnalisation pour transformer ces composés aldéhyde aromatiques bio-sourcés en de tels précurseurs dialdéhyde aromatiques réactifs. Les précurseurs obtenus ont ensuite été utilisés en synthèses de résines résole sans formaldéhyde et bio-sourcées. Après caractérisation de ces résines, nous avons enfin identifié des précurseurs donnant accès à des résines résole bio-sourcées avec des propriétés de charbonnement supérieures aux résines formophénoliques actuelles. En résumé, ces nouveaux précurseurs aldéhyde bio-sourcés représentent des alternatives prometteuses à l'usage de formaldéhyde pour la synthèse de résines résole avec des propriétés cibles pour des applications dans l'industrie aéropatiale
Resol-type phenolic resins present applicative and thermal properties suitable for applications such as composite manufacture in aeropatial industry. Especially, resols can be polymerized stage-wise and present after curing high char yield properties. However, those resins are typically synthesized from formaldehyde and phenol. Those precursors are both classified as Carcinogenic Mutagenic Reprotoxic (CMR), respectively 1B and 2, and are petrobased. Because of this classification and of the fossil feedstock depletion, SAFRAN-Herakles wants to substitute formaldehyde by non-toxic and biobased aldehyde precursors. Aromatic aldehyde precursors such as 4-hydroxybenzaldehyde, vanillin and syringaldehyde are interestingly non-toxic and can be produced from the cheap and abundant lignins. Nevertheless, we have shown that those precursors are not reactive in resol synthesis conditions. Also, we have shown that difunctional and reactive aromatic aldehyde precursors are suitable for the synthesis of high char yield resins. Then, we have designed two functionalization methods to turn the biobased aldehyde precursors into difunctional and reactive ones. Finally, those precursors have been used for the synthesis of biobased resols without formaldehyde. Those new resins can be polymerized stage-wise and present higher char yield properties than the current formophenolic resins. Hence, those new biobased aldehyde precursors represent promising alternatives to formaldehyde for the synthesis of resols with target properties for aerospatial industry applications
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Abdennadher, Mohamed-Naceur. "Valorisation de la lignine organocell par le système oxydant ozone-forane 113." Toulouse, INPT, 1987. http://www.theses.fr/1987INPT002G.

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Puzio, Kinga. "Towards controlled release of Vanillin and bio-sensing of Adenosine monophosphate using molecularly imprinted polymers." Thesis, Orléans, 2012. http://www.theses.fr/2012ORLE2075.

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Ce mémoire présente une exploration des polymères à empreintes moléculaires (MIP) comme outils d’une libération contrôlée de bioactifs olfactifs ou pour le criblage/préselection de composés à activité antivirales ou anti-tumorales sur le site actif d’une enzyme. La première partie est une étude de la complexation de la vanilline sur des billes polymériques sphériques en vue d’une libération contrôlée (pH, salinité, …). Ces études portent sur les caractéristiques de l'absorption et la libération de la molécule d'intérêt dans le milieu aqueux sur les microsphères fonctionnalisées fourni par Merck ESTAPOR® Microsphères. Nous avons ensuite synthétisé divers MIP de vanilline au format monolithique. Plusieurs stratégies d’impression ont été étudiées: non covalente, covalente et semi-covalente. La composition du MIP préparé dans chaque approche a été optimisée pour obtenir les meilleures propriétés et performances. L'affinité, la sélectivité et la capacité du MIP ont été déterminées. Les MIPs ont été évalués par extraction en phase solide (SPE) d'analogues structuraux de la vanilline dans des échantillons naturels (extrait de vanille, vin). La deuxième partie de ce mémoire concerne l’évaluation de MIPs de l’adénosine 5’-monophosphate (AMP) Le polymère a été préparé par une approche non-covalente et son efficacité de recapture a été caractérisée par analyse frontale (FA). L’analyse frontale est une technique qui permet de discriminer des interactions spécifiques des non spécifiques et de comprendre les mécanismes de liaison dans des cavités spécifiques
This thesis report presents the exploration of molecularly imprinted polymers (MIP) for the application in controlled release and targeting antivirus and anticancer drugs. The first part of this study describes the imprinting of vanillin as a monolith. Several strategies were studied: non-covalent, covalent and semi-covalent. The composition of the MIP prepared in each approach was optimized to obtain the best properties and performance. The affinity, selectivity and capacity of MIP were determined. MIPs were evaluated in solid-phase extraction (SPE) of structural analogues in natural samples (vanilla extract, wine). We also present the study of the exploration of spherical beads as potential tools for the controlled release of vanillin. These studies concern the characteristics of uptake and release of the molecule of interest in the aqueous medium on functionalised microspheres supplied by Merck ESTAPOR Microspheres®. The second part of this thesis is devoted to studies on the evaluation of MIP of adenosine 5'-monophosphate (AMP). The polymer was prepared in non-covalent approach and efficiency of binding was characterised using frontal analysis (FA). FA is a useful technique that allows discriminate specific and nonspecific interactions and to understand the binding mechanisms in specific cavities
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JAWAD, MOHAMED ADEL. "Etude electrochimique de la vanilline et de constituants alimentaires dans les produits lactes." Nantes, 1991. http://www.theses.fr/1991NANT2015.

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Des dosages electrochimiques d'additifs ou de constituants electroactifs sont effectues sans traitement prealable au sein meme de milieux alimentaires. Le comportement electrochimique de solutions de vanilline, selectionnee comme molecule test a doser, est plus particulierement etudie, et un produit nouveau, appartenant a la famille des 1,4-benzodioxine, est obtenu lors de l'electrolyse preparative anodique a potentiel controle sur mousse de carbone d'une solution aqueuse de vanilline. Le lait, choisi comme milieu d'analyse, presente un pic d'oxydation. Le compose responsable de ce pic dans le lait commercial est l'acide urique, et dans le lait humain, l'acide ascorbique. La teneur de ces deux composes dans le lait est determinee. Les modifications des caracteristiques electrochimiques de la vanilline entre les milieux aqueux et alimentaires sont majoritairement engendrees par le serum albumine bovine. La potentialite de l'electrochimie a l'etude des interactions petites molecules-proteines est mise en evidence
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Guiraud, Pascale. "Métabolisation de l'acide vanillique par les micromycètes : relation avec la production de phénoloxydases extracellulaires." Université Joseph Fourier (Grenoble), 1991. http://www.theses.fr/1991GRE18002.

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Books on the topic "Vanilline"

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Tercier, Nicole Stäuble. Vanille, safran. Genève: Conservatoire et jardin botaniques de Genève, 1992.

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Handbook of vanilla science and technology. Chichester, West Sussex: Wiley-Blackwell, 2011.

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Villa Vanille: Roman. Paris: A. Michel, 1995.

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Jean, Meze, ed. Vanille: La route Bourbon. Le Bar sur Loup: Bourbon, 2010.

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Grenier, Christian. Pour l'amour de Vanille. Montrouge: Bayard jeunesse, 2012.

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Pan, Ruqiu. Effect of iron on reactivity of vanillin in wine models. St. Catharines, Ont: Brock University, Dept. of Chemistry, 2004.

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Muszer, Dariusz. Die Freiheit riecht nach Vanille: Roman. München: A1 Verlag, 1999.

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La vraie couleur de la vanille. Paris: L'École des loisirs, 2012.

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Wilhelm Haarmann auf den Spuren der Vanille: Forscher, Unternehmer und Pionier der Riechstoffe. Holzminden: Verlag Jörg Mitzkat, 2012.

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Barret, Jacquelin. Résultats campagne 1993 de préparation de vanille. [Mamoudzou]: Collectivité territoriale de Mayotte, Direction de l'agriculture et de la forêt, 1993.

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Book chapters on the topic "Vanilline"

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Bährle-Rapp, Marina. "Vanillin." In Springer Lexikon Kosmetik und Körperpflege, 578. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_10953.

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Wang, Xiao-Bo, Li-Da Du, Shu-Mei Wang, and Guan-Hua Du. "Vanillin." In Natural Small Molecule Drugs from Plants, 343–46. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-8022-7_57.

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Bährle-Rapp, Marina. "Ethyl Vanillin." In Springer Lexikon Kosmetik und Körperpflege, 194. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_3798.

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Labuda, Ivica. "Biotechnology of Vanillin: Vanillin from Microbial Sources." In Handbook of Vanilla Science and Technology, 299–331. Oxford, UK: Wiley-Blackwell, 2010. http://dx.doi.org/10.1002/9781444329353.ch19.

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Havkin-Frenkel, Daphna, Andrzej Podstolski, Ewa Witkowska, Piotr Molecki, and Monika Mikolajczyk. "Vanillin Biosynthetic Pathways." In Plant Cell and Tissue Culture for the Production of Food Ingredients, 35–43. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4753-2_4.

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Bährle-Rapp, Marina. "Vanille." In Springer Lexikon Kosmetik und Körperpflege, 578. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_10952.

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Havkin-Frenkel, Daphna, and Faith C. Belanger. "Biotechnological production of vanillin." In Biotechnology in Flavor Production, 165–92. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781118354056.ch5.

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Khoyratty, Shahnoo, Rob Verpoorte, and Hippolyte Kodja. "Vanillin: Biosynthesis, Biotechnology, and Bioproduction." In Reference Series in Phytochemistry, 341–58. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-38392-3_14.

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Khoyratty, Shahnoo, Rob Verpoorte, and Hippolyte Kodja. "Vanillin: Biosynthesis, Biotechnology, and Bioproduction." In Reference Series in Phytochemistry, 1–18. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-11257-8_14-1.

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Khoyratty, Shahnoo, Rob Verpoorte, and Hippolyte Kodja. "Vanillin: Biosynthesis, Biotechnology, and Bioproduction." In Reference Series in Phytochemistry, 1–18. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-11257-8_14-2.

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Conference papers on the topic "Vanilline"

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Kashimura, Keiichiro, Chen Qu, Tomohiko Mitani, Naoki Shinohara, and Takashi Watanabe. "Microwave frequency dependence of thermal distribution in the production of vanillin and vanillic acid from lignocellulosic biomass." In 2016 Progress in Electromagnetic Research Symposium (PIERS). IEEE, 2016. http://dx.doi.org/10.1109/piers.2016.7735582.

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Eltayeb, M. "Preparation and characterization of nanoparticles for encapsulation and delivery vehicles." In Advanced Topics in Mechanics of Materials, Structures and Construction. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902592-18.

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Abstract. This research creates nanoparticles that are tunable, have a high active ingredient content, and are highly encapsulated and controlled. We use model materials to determine the ethylcellulose-vanillin ratios as well as the effective processing conditions required for nanoparticle formation using ethylcellulose and vanillin as active ingredients. Nanoparticles with a mean size of 45 to 64 nm were prepared at a rate of approximately 1.3 million nanoparticles per minute using a different polymer:vanillin ratio. The encapsulation efficiency and loading of vanillin at different concentrations in nanoparticles from solutions ranged from 75 to 94 percent and 66.90 to 86.54 percent, respectively, indicating that the loading and encapsulation efficiency of the nanoparticles decreased as the amount of vanillin increased.
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Thaweboon, Sroisiri, Ratchaporn Srichan, Supaporn Mala, and Boonyanit Thaweboon. "The Development of Artificial Saliva with Oral Wound Healing Property." In 2023 7th International Conference on Nanomaterials and Biomaterials & 2023 5th Asia Conference on Material and Manufacturing Technology. Switzerland: Trans Tech Publications Ltd, 2024. http://dx.doi.org/10.4028/p-wc6acn.

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Wound healing is a normal biological mechanism of the body that helps to maintain the integrity of the tissue. In this process, fibroblasts play an important role in supporting wound healing by migrating to the injury site and laying down a new extracellular matrix. Oral wounds heal more rapidly than skin wounds due to the presence of saliva. However, a reduced salivary flow rate or hyposalivation is frequently found in some patients due to their systemic conditions or intake of various medications. In order to control or treat hyposalivation, the use of artificial saliva is recommended for these patients. Various agents were added to artificial saliva to improve its properties. The aim of the present study was to investigate the effect of artificial saliva containing vanillin on the wound healing of human gingival fibroblasts by inducing cell migration in vitro. Human gingival fibroblasts isolated from human gingiva were purchased from Scien Cell Research Laboratories, USA. The migratory ability of fibroblasts was performed on a confluent monolayer by the wound healing scratch assay. Artificial saliva with different concentrations of vanillin (0.12% to 4% w/v) was added and incubated for 24 h. Artificial saliva without vanillin was used as a control. The migration cells were fixed with 25% methanol and 0.2% toluidine blue. In vitro cell migration to the wound area was determined by photographing with an inverted microscope coupled to a digital camera (Nikon D 5100). In the presence of 0.25%, 0.5%, and 1% w/v vanillin-containing artificial saliva, human gingival fibroblasts had a significantly higher potential to migrate into the wound area than a control (p-value <0.05). Data from this study provides the first scientific evidence to demonstrate the benefits of using artificial saliva containing vanillin to maintain healthy gums and accelerate oral wound healing. Rinsing the mouth with this artificial saliva is recommended as the most preferable method for moistening and lubricating the mouth and facilitating the healing of oral wounds in patients with hyposalivation.
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Jeremić, Svetlana, Nenad Janković, Jelena Đorović Jovanović, and Zoran Marković. "The assessment of the antioxidant capacity of the selected vanillin-based pyrido-dipyrimidines using DPPH assay: in silico approach." In 2nd International Conference on Chemo and Bioinformatics. Institute for Information Technologies, University of Kragujevac, 2023. http://dx.doi.org/10.46793/iccbi23.613j.

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It is known that pyridine derivatives possess significant biological activity, and that vanillin is a natural aromatic compound with pharmacoecological properties. Earlier research indicated that among the series of synthesized vanillin-based pyrido-dipyrimidine compounds, two of them show significant antioxidative activity. Based on the thermodynamic parameters obtained using the DFT method, the operative mechanism of the reaction of the investigated antioxidants with the DPPH radical was considered. Calculations are done in water, methanol, and benzene, to imitate real experimental conditions, and to examine the reaction mechanisms under the environment of different polarity. HAT and SPLET mechanisms were identified as operative reaction mechanisms. Which reaction pathway is dominant was found to be independent of the nature of the solvent. A molecule with two O-H groups can react through both O-H groups simultaneously, so it shows a higher antioxidant capacity than a molecule with one O-H group, which is in accordance with the experimentally obtained results.
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Cox, Ashley, Kathleen Brown, and Monica Valentovic. "Effects of the E-liquid Flavoring Agents Vanillin and Ethyl Vanillin in Human Proximal Tubule Epithelial Cells." In ASPET 2023 Annual Meeting Abstracts. American Society for Pharmacology and Experimental Therapeutics, 2023. http://dx.doi.org/10.1124/jpet.122.219880.

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Retnosari, Rini, Ihsan B. Rachman, Sutrisno Sutrisno, Meyga E. F. Sari, Dedek Sukarianingsih, and Yaya Rukayadi. "The antibacterial activity of vanillin derivative compounds." In 4TH INTERNATIONAL SEMINAR ON CHEMISTRY. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0051523.

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Marković, Violeta R., Jovana M. Muškinja, and Tamara Lj Todorović. "Synthesis and antioxidant activity of novel vanillin-based ferrocenyl chalcones." In 2nd International Conference on Chemo and Bioinformatics. Institute for Information Technologies, University of Kragujevac, 2023. http://dx.doi.org/10.46793/iccbi23.547m.

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A small series of new ferrocenyl chalcones was prepared, starting from the corresponding aldehydes and monoacetyl ferrocene. Di-derivatives of vanillin and ethylvanillin were prepared and used as aldehydes for this synthesis. All new compounds were characterized by IR and NMR spectroscopy and physical data. The antioxidant potential of new compounds was evaluated using the DPPH test and the results showed moderate activity in vitro.
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Viseshsin, Napat, Pimwalun Sukhitkul, Rangsalid Panyadee, Chularat Sakdaronnarong, and Pattaraporn Posoknistakul. "Study of vanillin formation under oxygen delignification process." In 2018 IEEE 5th International Conference on Engineering Technologies and Applied Sciences (ICETAS). IEEE, 2018. http://dx.doi.org/10.1109/icetas.2018.8629121.

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Rahayu, Reni, Muhammad A. Aziz, Mohammad Holil, and Mardi Santoso. "Synthesis of new vanillin derivatives from natural eugenol." In 4TH INTERNATIONAL SEMINAR ON CHEMISTRY. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0051751.

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Rajesh, T. S. F., A. S. Mideen, J. Karthikeyan, and A. MuthuKrishnan. "Inhibition effect of the corrosion of mild steel in acidic solutions by Vanillin-4-methylthio semicarbazone and Vanillin-4-ethylthiosemi-carbazone." In International Conference on Frontiers in Automobile and Mechanical Engineering (FAME 2010). IEEE, 2010. http://dx.doi.org/10.1109/fame.2010.5714842.

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Reports on the topic "Vanilline"

1

Beckham, Gregg. Catalytic Depolymerization and Upgrading of Lignin for Vanillin Production: Cooperative Research and Development Final Report, CRADA Number CRD-14-545. Office of Scientific and Technical Information (OSTI), March 2017. http://dx.doi.org/10.2172/1350019.

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Aggarwal, R. L., L. W. Farrar, B. G. Saar, T. H. Jeys, and R. B. Goodman. Measurement of the Absolute Raman Cross Sections of Diethyl Phthalate, Dimethyl Phthalate, Ethyl Cinnamate, Propylene Carbonate, Tripropyl Phosphate, 1,3-Cyclohexanedione, 3'-Aminoacetophenone, 3'-Hydroxyacetophenone, Diethyl Acetamidomalonate, Isovanillin, Lactide, Meldrum's Acid, p-Tolyl Sulfoxide, and Vanillin. Fort Belvoir, VA: Defense Technical Information Center, September 2013. http://dx.doi.org/10.21236/ada591110.

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Pichersky, Eran, Alexander Vainstein, and Natalia Dudareva. Scent biosynthesis in petunia flowers under normal and adverse environmental conditions. United States Department of Agriculture, January 2014. http://dx.doi.org/10.32747/2014.7699859.bard.

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The ability of flowering plants to prosper throughout evolution, and for many crop plants to set fruit, is strongly dependent on their ability to attract pollinators. To that end many plants synthesize a spectrum of volatile compounds in their flowers. Scent is a highly dynamic trait that is strongly influenced by the environment. However, with high temperature conditions becoming more common, the molecular interplay between this type of stress and scent biosynthesis need to be investigated. Using petunia as a model system, our project had three objectives: (1) Determine the expression patterns of genes encoding biosynthetic scent genes (BSGs) and of several genes previously identified as encoding transcription factors involved in scent regulation under normal and elevated temperature conditions. (2) Examine the function of petunia transcription factors and a heterologous transcription factor, PAPl, in regulating genes of the phenylpropanoid/benzenoid scent pathway. (3) Study the mechanism of transcriptional regulation by several petunia transcription factors and PAPl of scent genes under normal and elevated temperature conditions by examining the interactions between these transcription factors and the promoters of target genes. Our work accomplished the first two goals but was unable to complete the third goal because of lack of time and resources. Our general finding was that when plants grew at higher temperatures (28C day/22C night, vs. 22C/16C), their scent emission decreased in general, with the exception of a few volatiles such as vanillin. To understand why, we looked at gene transcription levels, and saw that generally there was a good correlation between levels of transcriptions of gene specifying enzymes for specific scent compounds and levels of emission of the corresponding scent compounds. Enzyme activity levels, however, showed little difference between plants growing at different temperature regimes. Plants expressing the heterologous gene PAPl showed general increase in scent emission in control temperature conditions but emission decreased at the higher temperature conditions, as seen for control plants. Finally, expression of several transcription factor genes decreased at high temperature, but expression of new transcription factor, EOB-V, increased, implicating it in the decrease of transcription of BSGs. The major conclusion of this work is that high temperature conditions negatively affect scent emission from plants, but that some genetic engineering approaches could ameliorate this problem.
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Struthers, Kim. Natural resource conditions at Fort Pulaski National Monument: Findings and management considerations for selected resources. National Park Service, December 2023. http://dx.doi.org/10.36967/2300064.

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The National Park Service (NPS) Water Resources Division’s Natural Resource Condition Assessment (NRCA) Program initiated an NRCA project with Fort Pulaski National Monument (FOPU) in 2022. The purpose of an NRCA is to synthesize information related to the primary drivers and stressors affecting natural resource conditions at a park and to report conditions for natural resource topics selected by park managers. Resource conditions are evaluated as either a condition assessment or a gap analysis, depending on data availability. For FOPU’s NRCA, managers selected salt marsh, shorebirds, Eastern oyster (Crassostrea virginica), and butterflies as the focal resources. FOPU is comprised of two islands in coastal Georgia, McQueens and Cockspur, which are separated by the Savannah River near its confluence with the Atlantic Ocean. Cockspur Island contains the 19th century masonry fort, Fort Pulaski, and the monument’s visitor services and facilities and is primarily constructed with dredge material from the Savannah River. McQueens Island is almost entirely salt marsh habitat and most of its area is eligible federal wilderness, containing one of Georgia’s oyster recreational harvest areas (RHAs), Oyster Creek RHA. Both McQueens and Cockspur islands are designated as a National Oceanic and Atmospheric Administration Marine Protected Area (MPA), underscoring FOPU’s natural resource significance. Riverine, freshwater, and estuarine wetlands cover 83.81% of FOPU, with the latter accounting for almost 99% of all monument wetlands. Persistently emergent vegetation of smooth cordgrasses (Spartina spp.) and unconsolidated shore represent the dominant wetland types. McQueens Island estuarine wetlands were evaluated for 11 functions and were rated primarily as high functioning, except for the wetland north of Highway 80, where the causeway has altered its ability to function properly. The wetland west of the Highway 80 bend is composed of unconsolidated material so was rated as moderately functioning in carbon sequestration, retention of sediments, and shore stabilization. In contrast, the unconsolidated shore wetland in the Oyster Creek RHA, where the highest concentration of FOPU’s oysters occurs, were rated high for all expected wetland functions. In 2013, over 75% of the total oyster area from within four of Georgia’s RHAs was in the Oyster Creek RHA. A spectral analysis of oyster density in Oyster Creek RHA, comparing 2013 and 2018 images, reported an increase in the high-density class, a decrease in the moderate-low class, and an increase in the no oyster class, with the latter likely a function of how oyster areas were drawn between the images. A successful 2013 enhanced reef project in Oyster Creek RHA reported a pre-enhancement oyster area of 2.68 m2 (28.8 ft2) that increased to 894.2 m2 (0.22 ac) of oysters by 2018. FOPU’s extensive salt marsh habitat and beaches provide critical food sources and habitat for shorebirds in the Atlantic Flyway, especially during the pre-breeding season. The American Oystercatcher (Haematopus palliates), Whimbrel (Numenius phaeopus), and the federally threatened rufa subspecies of Red Knot (Calidris canutus rufa) are identified as high priority species in the flyway and have been observed on Cockspur Island during the Manomet International Shorebird Surveys (2019–2022) at FOPU. The USFWS (2023) is seeking additional critical habitat designation, which will include Cockspur Island, for the rufa subspecies of Red Knot, whose estimated population abundance trend is declining throughout its entire range. FOPU’s non-wetland, upland habitat is primarily located on Cockspur Island and supports vegetation that can serve as host, roost and/or nectar plants for pollinators, especially butterflies. Cedar–Live Oak–Cabbage Palmetto (Juniperus virginiana var. silicicola–Q. virginiana–Sabal palmetto) Marsh Hammock and Cabbage Palmetto Woodland contain the most diversity of beneficial butterfly plants. While a comprehensive butterfly inventory is needed, fall migration surveys have recorded three target species of the Butterflies of the Atlantic Flyway (BAFA): monarch (Danaus plexippus), gulf fritillary (Agraulis vanillae), and cloudless sulphur (Phoebis sennae). Collectively, FOPU’s natural resources are affected by the sea level, which has risen by 0.35 m (1.15 ft) from 1935 to 2022. Hardened shorelines, such as causeways or armored structures, are identified as the greatest threat to the salt marsh habitat’s ability to migrate upland with continued sea level rise. Erosion along Cockspur Island’s north shore is an ongoing issue and FOPU managers have been working with the U.S. Army Corps of Engineers to develop solutions to address the erosion, while also creating habitat for shorebirds. Several agencies routinely monitor for water and sediment pollution in and around FOPU, which, if managed collectively, can inform landscape-level management actions to address drivers that are influencing resource conditions at the ecosystem level.
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