Relevant bibliographies by topics / Fatty acids – Separation

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Fatty acids – Separation'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Fatty acids – Separation.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Fatty acids – Separation"

1

Boudreau, Tracy M., and Gordon A. Hill. "Improved ethanol–water separation using fatty acids." Process Biochemistry 41, no. 4 (April 2006): 980–83. http://dx.doi.org/10.1016/j.procbio.2005.11.006.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Krishna Kumar, N. S., and D. N. Bhowmick. "Separation of fatty acids/triacylglycerol by membranes." Journal of the American Oil Chemists' Society 73, no. 3 (March 1996): 399–401. http://dx.doi.org/10.1007/bf02523439.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Tiuca, Ioana, Katalin Nagy, and Radu Oprean. "Recent developments in fatty acids profile determination in biological samples - a review." Revista Romana de Medicina de Laborator 23, no. 4 (December 1, 2015): 371–84. http://dx.doi.org/10.1515/rrlm-2015-0035.

Full text
Abstract:
Abstract The present paper is a literature review of the recent years dealing with the most important separation techniques of fatty acids in biological samples. Our aim was to make a synthesis of the analytical methods used, to note the most used ones, but also to mention other methods that are less utilized, which can have important advantages (such as less time consuming, greener reagents, etc.). Gas-chromatographic separation methods were described and compared to liquid chromatographic separations of fatty acids in different types of biological samples. In the same time, the importance of determining fatty acids profiles in biological samples was revealed, pointing out the possible implications in diagnostics of different types of disorders or remarking different profiles compared to healthy states.
APA, Harvard, Vancouver, ISO, and other styles
4

Gutnikov, George, Wolfgang Beck, and Heinz Engelhardt. "Separation of homologous fatty acids by capillary electrophoresis." Journal of Microcolumn Separations 6, no. 6 (November 1994): 565–70. http://dx.doi.org/10.1002/mcs.1220060606.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Nadirov, K. S., N. Sh Otarbaev, R. K. Nadirov, V. M. Kapustin, A. S. Sadyrbaeva, and G. Zh Bimbetova. "SEPARATION OF FREE FATTY ACIDS FROM COTTON TAR." NEWS of National Academy of Sciences of the Republic of Kazakhstan 4, no. 436 (August 15, 2019): 70–78. http://dx.doi.org/10.32014/2019.2518-170x.99.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Bousquet, Olivier, and François Le Goffic. "Counter-current chromatographic separation of polyunsaturated fatty acids." Journal of Chromatography A 704, no. 1 (June 1995): 211–16. http://dx.doi.org/10.1016/0021-9673(94)01233-5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Gupta, Abhinaba, and Ned B. Bowden. "Separation of cis-Fatty Acids from Saturated and trans-Fatty Acids by Nanoporous Polydicyclopentadiene Membranes." ACS Applied Materials & Interfaces 5, no. 3 (January 15, 2013): 924–33. http://dx.doi.org/10.1021/am3025867.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Mohd Fadzel, Fatimatuzzahraa, Jumat Salimon, and Darfizzi Derawi. "Low-Energy Separation Technique on Purification of Unsaturated Fatty Acids of Palm Stearin using Methanol Crystallization Method." Sains Malaysiana 50, no. 1 (January 31, 2021): 151–60. http://dx.doi.org/10.17576/jsm-2021-5001-15.

Full text
Abstract:
This paper discussed the development of a low-energy and cost-effective separation technique of saturated fatty acids (S FAs) from Malaysian Palm Stearin to purify the unsaturation level of its fatty acids. Unsaturated fatty acids (U FAs) pose great benefits in nutritional value and also can be utilized as a raw material in various food or non-food applications. A methanol crystallization separation method was introduced by manipulating the storage temperature as well as the mixture ratio of palm stearin fatty acids (PSFAs) and methanol as a solvent. The separated compounds were characterized using Fourier-transform infrared (FTIR) spectroscopy, proton (1H-NMR), and carbon (13C-NMR) spectroscopy analysis techniques. The fatty acids composition for both U FAs and S FAs were determined through gas chromatography (GC)analysis technique. The highest separation yield was about 98% (wt.), using a mixture of PSFA:methanol; 1:9 (w/v) at the temperature of -20 °C. This method was successfully separated and purified the U FAs by increasing the unsaturation level of fatty acids about 172% as the final iodine value was about 98 compared to the initial value was at 36. The low-energy methanol crystallization separation method is a cheaper method compared to the conventional high-energy fractional distillation process and positively to be up scaled at industrial level.
APA, Harvard, Vancouver, ISO, and other styles
9

Mező, Emerencia, Anita Bufa, Csilla Páger, Viktória Poór, Tamás Marosvölgyi, Ferenc Kilár, and Lilla Makszin. "The Role of Ionic Liquid Interaction in the Separation of Fatty Acid Methyl Esters—Polyunsaturated Geometric Isomers in GC–MS." Separations 8, no. 4 (March 26, 2021): 38. http://dx.doi.org/10.3390/separations8040038.

Full text
Abstract:
Knowledge of the type and level of saturated and unsaturated fatty acids in food and clinical matrices is of practical importance, but the wide variety of fatty acids makes analyses very complex. The discrimination of the geometric isomers of fatty acid needs proper and effective separation conditions. The efficiency of three different stationary phases was evaluated by GC–MS methods in the separation of fatty acids in their methyl ester forms. Significant differences were observed in the efficiencies of polysiloxane-based (non-polar HP-5MS and medium/high polarity DB-225MS) and ionic liquid-based (SLB-IL111) columns. Baseline separation of the geometric isomers of linoleic acid methyl ester was obtained by the extremely polar SLB-IL111 column, showing a preference over the other two columns. The optimization of the experimental conditions (response linearity, limit of detection, limit of quantification, system suitability, intraday and interday repeatability and accuracy) showed the separation power of the ionic liquid interaction in the analyses by using short (25–30 m long) columns. By deducting the general principles of the interaction, predictions can be made for the separation of other isomers. The results facilitate the precise identification of various types of fatty acids in real samples for nutritional information.
APA, Harvard, Vancouver, ISO, and other styles
10

DOGARIS, IOANNIS, MIKAEL LINDSTROM, and GUNNAR HENRIKSSON. "Critical parameters for tall oil separation I: The importance of the ratio of fatty acids to rosin acids." TAPPI Journal 18, no. 9 (October 1, 2019): 547–55. http://dx.doi.org/10.32964/tj18.9.547.

Full text
Abstract:
Tall oil is a valuable byproduct in chemical pulping of wood, and its fractions have a large spectrum of applications as chemical precursors, detergents, and fuel. High recovery of tall oil is important for the economic and environmental profile of chemical pulp mills. The purpose of this study was to investigate critical parameters of tall oil separation from black liquor. To investigate this in a controlled way, we developed a model test system using a “synthetic” black liquor (active cooking chemicals OH- and HS- ions), a complete process for soap skimming, and determination of recovered tall oil based on solvent extraction and colorimetric analysis, with good reproducibility. We used the developed system to study the effect of the ratio of fatty acids to rosin acids on tall oil separation. When high amounts of rosin acids were present, tall oil recovery was low, while high content of fatty acids above 60% significantly promoted tall oil separation. Therefore, manipulating the content of fatty acids in black liquor before the soap skimming step can significantly affect the tall oil solubility, and hence its separation. The findings open up chemical ways to improve the tall oil yield.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Fatty acids – Separation"

1

Fardin-Kia, Ali Reza [Verfasser], Gerhard [Akademischer Betreuer] Jahreis, Jan [Akademischer Betreuer] Fritsche, and Sebastiano [Akademischer Betreuer] Banni. "Development of novel methods for separation of trans fatty acids and other nutritionally relevant or related fatty acids / Ali Reza Fardin-Kia. Gutachter: Gerhard Jahreis ; Jan Fritsche ; Sebastiano Banni." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2014. http://d-nb.info/1053959346/34.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Atiq, Omar. "Feasibility of membrane processes for Volatile Fatty Acids (VFAs) concentration:data elaboration, modelling and design." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

Find full text
Abstract:
The need for recovery and concentrate a Volatile Fatty Acids (VFAs) effluent resulting from a biological fermentation step, has aimed a feasibility study on pressure-driven membrane separation processing. A previous experimental campaign, carried out at LABIC-DICAM for the NoAW (No-Agricultural Waste) EU project, involving total recirculation and concentration trials on RO and NF modules, was the starting point for subsequent elaboration, modelling, simulation and preliminary design. The presented mass transfer-solution modelling allowed the estimation of both VFAs and Na+ real rejections for all investigated total recirculation trials. The modelling ability to assess the system’s osmotic pressure and polarization magnitude was successfully tested accounting for the validity of the osmotic-pressure model. Total recirculation trials calculated real rejections trends were interpolated using the Mason&Lonsdale and solution-diffusion transport models, providing a set of adjustable parameters. The interpolated RReal (Jv) curves were used in the simulation of the experimental concentration trials, proving our capability to fairly faithfully reproduce the experimental trends. The accomplishment encouraged the simulation of further concentration trials whose experimental evidence was not available. The simulations aimed at investigating the modules performances for different applied pressures with the final objective of identifying a few design best cases. Two possible process alternatives were proposed: pure RO process and an integrated process RO + NF. Subsequent comparison of the alternatives’ preliminary design best-cases showed the two to be competitive.
APA, Harvard, Vancouver, ISO, and other styles
3

Copelli, Thalita da Silva. "Prospecção bioquímica da biomassa global da cianobactéria tóxica Microcystis aeruginosa BB005." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1357.

Full text
Abstract:
Cianobactérias são microrganismos capazes de produzir substâncias com potencial biológico e biotecnológico. Tais substâncias podem acarretar em malefícios, causados pelas toxinas, ou ter em sua composição substâncias benéficas como carotenoides, lipídeos e enzimas, de interesse biotecnológico. Assim, esse trabalho teve como objetivo avaliar a toxicidade e prospectar componentes presentes na biomassa global da cianobactéria Microcystis aeruginosa BB005. A toxicidade foi avaliada através de bioensaios com Daphnia magna, e a biomassa seca foi caracterizada por análises dos ésteres metílicos de ácidos graxos (EMAGs), determinação de carotenoides, obtenção do perfil proteico por eletroforese e hidrólise ácida de carboidratos. Também foi empregada uma metodologia de separação adsortiva por bolhas a fim de separar o pigmento ficocianina e enzimas de interesse biotecnológico (e.g. fosfatase alcalina e lipase) utilizando o sobrenadante de um cultivo. Apesar de ter sido possível quantificar a produção de toxinas pela cepa BB005, os ensaios ecotoxicológicos não permitiram estabelecer uma correlação entre a concentração de toxina e a imobilidade dos organismos. O perfil de EMAGs apresentou preponderância de PUFAs (ω-ácidos graxos) sendo que os linolenatos corresponderam a 25% do total. O teor de carotenoides encontrado durante a purificação dos lipídeos transesterificados e expresso como β-caroteno foi de 6,66 mg/g de biomassa seca. A eletroforese mostrou pelo menos 15 bandas distintas de proteínas e o perfil cromatográfico dos hidrolisados de carboidratos mostrou maior concentração do monossacarídeo glucose e de um dissacarídeo de glucose, possivelmente maltose. A separação de proteínas por espumação apresentou uma correlação direta entre fluxo de nitrogênio e a fração de espuma coletada. O fator de enriquecimento para a ficocianina foi de 41,69 utilizando fluxo de 20 mL/min de N2. Para a enzima fosfatase alcalina, os melhores resultados foram obtidos para o fluxo de 120 mL/min de N2, que apresentou fator de enriquecimento e de purificação de 5,25 e 2,85, respectivamente. Portanto, este trabalho demonstrou a importância de investigações sobre os componentes oriundos de M. aeruginosa, sobretudo dos EMAGs incomuns, a quantidade expressiva de carotenos e ainda da separação da ficobilina e de enzimas chave nos processos bioquímicos utilizando o processo por espumação.
Cyanobacteria are microorganisms able to produce substances with high biological and biotechnological potential. These substances may cause disorders because of the toxins or may be composed by beneficial substances such as carotenoids, lipids and enzymes of technological interest. Hence, the scope of the current research was centered in the toxicity evaluation or prospect the substances from the Microcystis aeruginosa cyanobacterium biomass – BB 005. Daphnia magna was used in the toxicity bioassays and the cyanobacterium dry biomass was characterized by the transesterified lipids analysis, carotenoid determination, electrophoretic profile for proteins and acid hydrolysis of polysaccharides. The foam fractionation methodology was performed to separate the phycocyanin pigment and enzymes (e.g. alkaline phosphatase and lipase), using the supernatant from a liquid culture of the cyanobacterium. Although it was possible to quantify the production of toxins by BB005 strain, the ecotoxicological tests have no establish a correlation between toxin concentration and the immobility of organism bodies.The methyl esters profile in which there was a large amount of PUFAs (ω-fatty acids) with 25% of linolenates. The carotenoid content found during the lipids transesterificaction, expressed as β – carotene, was 6.6 mg/g of dry mass. The electrophoresis indicated at least 15 distinct bands of proteins and the chromatographic profile from the native polymeric carbohydrates indicated higher concentration of monosaccharide glucose and a glucose disaccharide, possible maltose. Proteins separation through foaming showed a direct correlation between the nitrogen flow and the collected foam. The phycocianin enrichment factor was high, 41.69, at a 20 mL/min N 2 flow. While in the case of alkaline phosphatase the best result was attained in the 120 mL/min of N2 flow which lead to enrichment and purification factors equal to 5.25 and 2.85 respectively. Therefore, this research has demonstrated the importance of the investigation on compounds from the M. aeruginosa entire biomass, especially the methyl esters from less common and highly insaturated fatty acids, an expressive content of carotenoids and, furthermore, the separation of phycobillin and key- enzymes for biochemical processes, that were feasibly and primarily demonstrated in this experiment by the use of foaming procedure.
5000
APA, Harvard, Vancouver, ISO, and other styles
4

Fayad, Nidal. "Mise en oeuvre du procédé d'électrocoagulation pour le traitement des eaux usées et pour la séparation et la purification de milieux biologiques." Thesis, Université Clermont Auvergne‎ (2017-2020), 2017. http://www.theses.fr/2017CLFAC024/document.

Full text
Abstract:
L'électrocoagulation (EC) est une méthode électrochimique non spécifique couramment utilisée pour le traitement de l'eau et des eaux usées. Dans ce travail, l’EC est d'abord étudiée comme une technique classique de traitement des eaux usées dédiée à l'élimination des protéines de lactosérum de l'eau pour laquelle les mécanismes d'élimination sont expliqués et un modèle est développé. Ensuite, l'utilisation de l’EC est étendue à la séparation et à la purification d’acides gras volatils issus de la fermentation acidogénique. Dans cette deuxième étude, les effets des paramètres opératoires sur l'efficacité et le coût de l’EC sont discutés. En outre, l’EC est utilisée pour la récolte de deux espèces de microalgues de leur milieu de culture. En ce qui concerne la récolte de Chlamydomonas reinhardtii, la méthodologie de la surface de réponse est utilisée et deux modèles permettant de prédire respectivement l'efficacité de la récupération et le coût opératoire sont développés. La récolte d’une autre espèce de microalgues, Chlorella vulgaris, est étudiée en utilisant l’EC respectivement en mode discontinu et continu. En mode discontinu, les effets des principaux paramètres de fonctionnement sur l'efficacité du processus sont expliqués et les mécanismes de récupération sont discutés. Dans l'étude en mode continu, la méthodologie de la surface de réponse est utilisée et un modèle permettant de prédire l’efficacité de récupération des microalgues est développé. Enfin, la comparaison des performances de l'EC en mode continu avec et sans échange de polarité aux performances de l'EC en mode discontinu est effectuée
Electrocoagulation (EC) is a non-specific electrochemical method usually used for water and wastewater treatment. In this work, EC is firstly investigated as a conventional wastewater treatment technique for the removal of whey proteins from water, where the mechanisms of removal are explained and a model on whey proteins elimination is developed. Then, EC use is extended for the separation and purification of volatile fatty acids issued from acidogenic fermentation. In this second study, the effects of operating parameters on EC efficiency and cost are discussed. Moreover, EC is used for the harvesting of two microalgae species from their culture medium. In the study that concerns recovering Chlamydomonas reinhardtii, response surface methodology (RSM) is employed and two models for predicting recovery efficiency and operating cost are developed. The harvesting of the other microalgae species Chlorella vulgaris is studied using EC in the batch and continuous modes. In the batch mode, the effects of the main operating parameters on the process effectiveness are explained along with discussing the mechanisms of recovery. In the continuous mode study, response surface methodology (RSM) is applied and a model for predicting microalgae recovery is developed. Finally, comparison of EC performance in continuous mode with and without polarity exchange (PE) to EC performance in batch mode is carried out
APA, Harvard, Vancouver, ISO, and other styles
5

Mathew, Midhu. "Cyclic fatty acid monomers of alpha-linolenic acid : isolation and separation of isomers, and effects of structural parameters on their oxidation." Master's thesis, Université Laval, 2021. http://hdl.handle.net/20.500.11794/69060.

Full text
Abstract:
Les monomères cycliques d'acides gras (CFAM) provenant d'huiles riches en acide alphalinolénique (18:3; ALA) sont constitués de 16 isomères de structures cycliques à 5 et 6 atomes de carbone. Ils se forment lors de traitements thermiques des huiles, comme le raffinage et la friture. Conséquemment, les CFAMs se retrouvent dans l'alimentation humaine. La littérature scientifique rapporte les résultats de travaux sur les effets métaboliques des CFAMs dont le principal est la stéatose hépatique. Les isomères cycliques à 5 et à 6 carbones se forment simultanément lors du chauffage des huiles et l'obtention de l'un ou de l'autre, bien que possible par synthèse totale et par HPLC, est laborieuse et à faibles rendements, ce qui ajoute à la difficulté de la réalisation d'études métaboliques chez l'animal avec une seule de ces deux structures. Dans la première partie des travaux, présentés au chapitre II, nous nous sommes concentrés à mieux isoler les CFAMs de l'huile de lin, suivi d'une séparation supplémentaire en leurs principaux isomères CFAM-5 et CFAM-6 de l'acide linolénique, en utilisant une combinaison de chromatographie sur couche mince argentique, pour le développement de la méthode, et de chromatographie sur colonne, pour la production de fractions. Cinq fractions ont ainsi été récupérées à partir de la chromatographie argentique sur colonne avec le système de solvants hexane-acétate d'éthyleacide acétique dans les proportions volumétriques 120:30:1 . Les isomères des CFAMs de chacune des fractions ont ensuite été identifiés par GC-MS de leurs dérivés esters picolinyles. Les résultats indiquent que la fraction F-1 contient principalement des isomères CFAM-6. Deux isomères non rapportés dans la littérature, provisoirement identifiés comme des CFAM-5 conjugués, étaient aussi présents en faible quantité dans la fraction F-1. Une autre fraction, F-3, contenait des isomères de CFAMs uniquement à cycle de 5 atomes de carbones. Cette fraction comprenait aussi une faible quantité d'isomères de l'acide alpha-linolénique. La fraction intermédiaire F-2 contenait les deux types d'isomères des CFAMs. La littérature scientifique indique que les huiles végétales alimentaires peuvent s'oxyder et qu'elles peuvent causer des effets délétères sur la santé. Cependant, aucun travaux n'a porté sur l'oxydation des CFAM, les CFAM-Ox, ni sur leurs effets métaboliques potentiels. Pourtant, des similitudes structurelles peuvent être attendues entre celles de CFAM-Ox et celles de certaines phytoprostanes (PhytoPs) et isoprostanes (IsoPs), et potentiellement des activités biologiques analogues. Ainsi, l'objectif de la seconde partie des présents travaux, présentés au chapitre III, était d'étudier l'oxydation des CFAMs de l'acide alpha-linolénique. L'oxydation de ces CFAMs di-insaturés a été réalisée sous oxygène à des températures allant de 160 à 200 °C, sur des périodes de 8 heures. Les résultats indiquent qu'environ 60% des CFAM-5 sont oxydés au bout de 2 à 4 h et que leur oxydation se produit de manière significativement plus rapide que celle des CFAM-6, et à une vitesse qui s'approche de celle de l'oxydation de l'acide linoléique, acide gras également di-insaturé. Les différences observées entre les vitesses d'oxydation des CFAM-5 et des CFAM-6 sont probablement dues à la présence de positions bis-allyliques dans les structures CFAM-5, comme il s'en trouve dans l'acide linoléique, contrairement aux CFAM-6 qui contiennent des doubles liaisons isolées, séparées par deux atomes de carbone. Ces résultats suggèrent également que les niveaux rapportés dans la littérature scientifique des CFAMs dans les huiles de friture sont nécessairement sous-estimés car ils ne tiennent pas compte des CFAM-Ox.
Cyclic fatty acid monomers (CFAMs) from oils rich in alpha-linolenic acid (18: 3; ALA) consist of 16 isomers of 5 and 6 carbon ring structures. They are formed during thermal treatments of edible oils, such as refining and frying. Consequently, CFAMs are found in human food. The scientific literature reports the results of work on the metabolic effects of CFAMs, the main one of which is hepatic steatosis. The cyclic isomers of 5 and 6 carbons are formed simultaneously on heating oils and obtaining one or the other, although possible by total synthesis and HPLC, is laborious and in low yields. This contributes to the difficulty of performing metabolic studies in animals with just one of these two structures. In the first part of the work, presented in chapter II, we focused on better isolating the CFAMs from linseed oil, followed by an additional separation into their main isomers CFAM-5 and CFAM-6 of linolenic acid, using a combination of silver ion thin layer chromatography, for the development of the method, and column chromatography, for the production of fractions. Five fractions were thus recovered from silver ion column chromatography with the hexaneethyl acetate-acetic acid solvent system in volumetric proportions 120:30:1. The CFAM isomers of each of the fractions were then identified by GC-MS of their picolinic ester derivatives. The results indicate that fraction F-1 mainly contains CFAM-6 isomers. Two isomers not reported in the literature, tentatively identified as conjugated CFAM-5 isomers, were also present in small amounts in the F-1 fraction. Another fraction, F-3, contained isomers of CFAMs only with a ring of 5 carbon atoms. This fraction also contained a small amount of alpha-linolenic acid isomers. The intermediate fraction F-2 contained both types of CFAMs isomers. The scientific literature indicates that edible vegetable oils can oxidize and can cause deleterious health effects. However, no work has focused on the oxidation of CFAMs and their oxidation products, the CFAM-Ox, or their potential metabolic effects. However, structural similarities can be expected between those of CFAM-Ox and those of certain phytoprostanes (PhytoPs) and isoprostanes (IsoPs), and potentially similar biological activities. Thus, the objective of the second part of this work, presented in Chapter III, was to study the oxidation of CFAMs of alpha-linolenic acid. The oxidation of these diunsaturated CFAMs was carried out under oxygen at temperatures ranging from 160 to 200 °C, over periods of 8 hours. The results indicate that approximately 60% of CFAM-5 are oxidized after 2-4 h and that their oxidation occurs significantly faster than that of CFAM-6, and at a rate that approaches that of linoleic acid, also a di-unsaturated fatty acid. The differences observed between the oxidation rates of CFAM-5 and CFAM-6 are probably due to the presence of bis-allylic positions in CFAM-5 structures, as found in linoleic acid, unlike CFAM-6 which contain isolated double bonds separated by two carbon atoms. These results also suggest that the levels of CFAMs reported in frying oils in the scientific literature are necessarily underestimated because they do not take CFAM-Ox into account.
APA, Harvard, Vancouver, ISO, and other styles
6

Foucaud, Yann. "Récupération du tungstène à partir d'un skarn à faible contraste de séparation : apport de la modélisation moléculaire dans la flottation des minéraux calciques." Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0149.

Full text
Abstract:
Aujourd’hui, plus de 40 % des ressources mondiales en tungstène sont contenues dans les skarns, dont le gisement de Tabuaço (Portugal) constitue un archétype. Ce minerai contient de fortes teneurs en minéraux calciques (fluorite, apatite et vésuvianite) en association fine avec la scheelite (CaWO4) qui, étant donné leurs propriétés de surface proches, sont difficiles à séparer par flottation aux acides gras. Au cours de cette étude, ancrée dans le projet européen H2020 FAME, un procédé économique, écologique et transférable a été développé sur le minerai de Tabuaço afin de prouver la faisabilité minéralurgique de l’exploitation des skarns à tungstène, classé parmi les métaux critiques en Europe. En flottation, le système Na2CO3/Na2SiO3 a montré la meilleure efficacité en matière de dépression, obtenue grâce à des effets synergiques considérables. Ces derniers ont été décrits par des méthodes statistiques, spectroscopiques et atomistiques. En parallèle, l’influence des ratios entre différents acides carboxyliques au sein des formulations de collecteurs (huiles de tall) a été évaluée avec pour objectif d’améliorer la sélectivité de la flottation. La séparation par gravité augmentée (concentrateur centrifuge Falcon) a été examinée, optimisée puis combinée avec la flottation afin de produire un concentré commercialisable de scheelite titrant 63 % WO3 pour 59 % de récupération. Par ailleurs, en vue d’appréhender les mécanismes moléculaires impliqués dans la flottation, les interfaces de la fluorite et de la scheelite ont été modélisées en utilisant la théorie de la fonctionnelle de la densité. Cette étude a permis de caractériser l’état d’hydratation des deux minéraux, qui présentent des affinités différentes pour les molécules d’eau. En outre, l’adsorption des acides gras sur la fluorite a été étudiée afin de fournir des éléments de réponse, confirmés expérimentalement, au sujet des mécanismes d’adsorption de ces molécules sur les minéraux calciques
Nowadays, skarns represent more than 40% of the global resources in tungsten, which has been classified as a critical raw material in the European Union. In particular, the Tabuaço deposit constitutes an archetype of tungsten skarns and contains high amounts of calcium minerals, including fluorite, apatite, and vesuvianite, in close association with scheelite (CaWO4). According to their similar surface properties, the separation of these minerals by flotation with fatty acids is significantly difficult and, therefore, remains a scientific challenge. In this study, which has been conducted within the framework of the FAME H2020 European project, an economic, environment friendly, and transferable process has been developed for the Tabuaço ore to demonstrate the feasibility of the tungsten skarns processing. In the froth flotation process, the Na2CO3/Na2SiO3 system has exhibited the best efficiency in terms of gangue minerals depression due to considerable synergistic effects that have been subsequently described by statistical, spectroscopic, and atomistic methods. Meanwhile, the influence of the ratios between different carboxylic acids in the collector formulations (Tall Oil Fatty Acids) has been assessed to improve the flotation selectivity. In addition, the enhanced gravity separation (Falcon centrifuge concentrator) has been investigated, optimised, and combined with the flotation to produce a marketable scheelite concentrate assaying 63% WO3 with 59% recovery. Besides, to gain understanding in the molecular mechanisms involved in the flotation process, the fluorite and scheelite interfaces have been modelled using the density functional theory. This study has allowed to characterise the hydration state of these minerals, which display different affinities for water molecules. Furthermore, the adsorption of fatty acids on fluorite has been studied to unravel the adsorption mechanisms of these molecules on calcium minerals, confirmed by experimental investigations
APA, Harvard, Vancouver, ISO, and other styles
7

Saleh, Jehad. "A Membrane Separation Process for Biodiesel Purification." Thesis, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19730.

Full text
Abstract:
In the production of biodiesel via the transesterification of vegetable oils, purification to international standards is challenging. A key measure of biodiesel quality is the level of free glycerol in the biodiesel. In order to remove glycerol from fatty acid methyl ester (FAME or biodiesel), a membrane separation setup was tested. The main objective of this thesis was to develop a membrane process for the separation of free glycerol dispersed in FAME after completion of the transesterification reaction and to investigate the effect of different factors on glycerol removal. These factors included membrane pore size, pressure, temperature, and methanol, soap and water content. First, a study of the effect of different materials present in the transesterification reaction, such as water, soap, and methanol, on the final free glycerol separation was performed using a modified polyacrylonitrile (PAN) membrane, with 100 kD (ultrafiltration) molecular weight cut off for all runs at 25°C. Results showed low concentrations of water had a considerable effect in removing glycerol from the FAME. The mechanism of separation of free glycerol from FAME was due to the removal of an ultrafine dispersed glycerol-rich phase present in the untreated (or raw) FAME. The size of the droplets and the free glycerol separation both increased with increasing water content of the FAME. Next, three types of polymeric membranes in the ultrafiltration range with different molecular weight cut off, were tested at three fixed operating pressures and three operating temperatures (0, 5 and 25oC) to remove the free glycerol from a biodiesel reactor effluent. The ASTM standard for free glycerol concentration was met for the experiments performed at 25°C. The results of this study indicate that glycerol could be separated from raw FAME to meet ASTM and EN standards at methanol feed concentrations of up to 3 mass%. The process was demonstrated to rely on the formation of a dynamic polar layer on the membrane surface. Ceramic membranes of different pore sizes (0.05 µm (ultrafiltration (UF) range) and 0.2 µm (microfiltration (MF) range)) were used to treat raw FAME directly using the membrane separation set up at temperatures of 0, 5 and 25°C. The results were encouraging for the 0.05 µm pore size membrane at the highest temperature (25°C). The effect of temperature on glycerol removal was evident from its relation with the concentration factor (CF). Higher temperatures promoted the achievement of the appropriate CF value sooner for faster separation. Membrane pore size was also found to affect separation performance. A subsequent study revealed the effect of different variables on the size of the glycerol droplets using dynamic light scattering (DLS). A key parameter in the use of membrane separation technology is the size of the glycerol droplets and the influence of other components such as water, methanol and soaps on that droplet size. The effect of water, methanol, soap and glycerol on the size of suspended glycerol droplets in FAME was studied using a 3-level Box-Behnken experimental design technique. Standard statistical analysis techniques revealed the significant effect of water and glycerol on increasing droplet size while methanol and soap served to reduce the droplet size. Finally, a study on the effect of trans-membrane pressure (TMP) at different water concentrations in the FAME phase on glycerol removal using UF (0.03 µm pore size, polyethersulfone (PES)) and MF (0.1 and 0.22 µm pore sizes, PES) membranes at 25, 40 and 60°C was performed. Results showed that running at 25°C for the two membrane types produced the best results for glycerol removal and exceeded the ASTM and EN standards. An enhancement of glycerol removal was found by adding small amounts of water up to the maximum solubility limit in biodiesel. An increase in temperature resulted in an increase in the solubility of water in the FAME and less effective glycerol removal. Application of cake filtration theory and a gel layer model showed that the gel layer on the membrane surface is not compressible and the specific cake resistance and gel layer concentration decrease with increasing temperature. An approximate value for the limiting (steady-state) flux was reported and it was found that the highest fluxes were obtained at the lowest initial water concentrations at fixed temperatures. In conclusion, dispersed glycerol can be successfully removed from raw FAME (untreated FAME) using a membrane separation system to meet the ASTM biodiesel fuel standards. The addition of water close to the solubility limit to the FAME mixture enables the formation of larger glycerol droplets and makes the separation of these droplets straightforward.
APA, Harvard, Vancouver, ISO, and other styles
8

Solak, Nilüfer. "Structural Characterization and Quantitative Analysis by Interfacing Liquid Chromatography and/or Ion Mobility Separation with Multi-Dimensional Mass Spectrometry." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1270744150.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Berglund, Johan. "Separation of Water and Fat Signal in Magnetic Resonance Imaging : Advances in Methods Based on Chemical Shift." Doctoral thesis, Uppsala universitet, Enheten för radiologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-158111.

Full text
Abstract:
Magnetic resonance imaging (MRI) is one of the most important diagnostic tools of modern healthcare. The signal in medical MRI predominantly originates from water and fat molecules. Separation of the two components into water-only and fat-only images can improve diagnosis, and is the premier non-invasive method for measuring the amount and distribution of fatty tissue. Fat-water imaging (FWI) enables fast fat/water separation by model-based estimation from chemical shift encoded data, such as multi-echo acquisitions. Qualitative FWI is sufficient for visual separation of the components, while quantitative FWI also offers reliable estimates of the fat percentage in each pixel. The major problems of current FWI methods are long acquisition times, long reconstruction times, and reconstruction errors that degrade image quality. In this thesis, existing FWI methods were reviewed, and novel fully automatic methods were developed and evaluated, with a focus on fast 3D image reconstruction. All MRI data was acquired on standard clinical scanners. A triple-echo qualitative FWI method was developed for the specific application of 3D whole-body imaging. The method was compared with two reference methods, and demonstrated superior image quality when evaluated in 39 volunteers. The problem of qualitative FWI by dual-echo data with unconstrained echo times was solved, allowing faster and more flexible image acquisition than conventional FWI. Feasibility of the method was demonstrated in three volunteers and the noise performance was evaluated. Further, a quantitative multi-echo FWI method was developed. The signal separation was based on discrete whole-image optimization. Fast 3D image reconstruction with few reconstruction errors was demonstrated by abdominal imaging of ten volunteers. Lastly, a method was proposed for quantitative mapping of average fatty acid chain length and degree of saturation. The method was validated by imaging different oils, using gas-liquid chromatography (GLC) as the reference. The degree of saturation agreed well with GLC, and feasibility of the method was demonstrated in the thigh of a volunteer. The developed methods have applications in clinical settings, and are already being used in several research projects, including studies of obesity, dietary intervention, and the metabolic syndrome.
APA, Harvard, Vancouver, ISO, and other styles
10

Dogan, Eylem. "Two-phase Anaerobic Digestion Of Semi-solid Organic Wastes." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609280/index.pdf.

Full text
Abstract:
The objective of this study is to illustrate that phase separation improves the efficiency of an anaerobic system which digests semi-solid organic wastes. Organic fraction of municipal solid waste (OFMSW) was the semi-solid organic waste investigated. In the first part of the study, the optimum operational conditions for acidified reactor were determined by considering the volatile solid (VS) reductions and average acidification percentages at the end of two experimental sets conducted. Organic loading rate (OLR) of 15 g VS/L.day, pH value of 5.5 and hydraulic retention time (HRT) of 2 days were determined to be the optimum operational conditions for the acidification step. Maximum total volatile fatty acid and average acidification percentage were determined as 12405 mg as HAc/L and 28%, respectively in the reactor operated at optimum conditions. In the second part, an acidification reactor was operated at the optimum conditions determined in the first part. The effluents taken from this reactor as well as the waste stock used to feed this reactor were used as substrate in the biochemical methane potential (BMP) test. The results of BMP test revealed that the reactors fed by acidified samples indicated higher total chemical oxygen demand (tCOD) removals (39%), VS reductions (67%) and cumulative gas productions (265 mL). The result of this study indicated that the separation of the reactors could lead efficiency enhancement in the systems providing that effective control was achieved on acidified reactors.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Fatty acids – Separation"

1

Mayoof, S. M. T. Separation and identification of the fatty acid components of egg yolk lecithin by high performance liquid chromatography (HPLC). Wolverhampton: University of Wolverhampton, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Fatty acids – Separation"

1

Nayak, S. P., and S. Singha. "Novel Technology for Essential Fatty Acids: An Experimental Review." In Novel Water Treatment and Separation Methods, 313–30. Toronto ; Waretown, NJ : Apple Academic Press, 2017. | "Outcome of national conference REACT- 16, organized by the Laxminarayan Institute of Technology, Nagpur, Maharashtr , India, in 2016"--Introduction. || Includes bibliographical references and index.: Apple Academic Press, 2017. http://dx.doi.org/10.1201/9781315225395-23.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Halevy, A. H., and C. S. Whitehead. "Pollination-Induced Corolla Abscission and Senescence and the Role of Short-Chain Fatty Acids in the Process." In Cell Separation in Plants, 221–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-74161-6_21.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Oliw, Ernst H., and Anneli Wennman. "Chiral Phase-HPLC Separation of Hydroperoxyoctadecenoic Acids and Their Biosynthesis by Fatty Acid Dioxygenases." In Advanced Protocols in Oxidative Stress III, 85–95. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4939-1441-8_7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Sahashi, Yuko, Hirotoshi Ishizuka, Seiji Koike, and Kazuaki Suzuki. "Separation and Concentration of Polyunsaturated Fatty Acids by a Combined System of Liquid-Liquid Extraction and Membrane Separation." In Developments in Food Engineering, 674–76. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2674-2_218.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Han, Daeseok, Hyun-Kyung Shin, and Suk Hoo Yoon. "Separation of ω3 Polyunsaturated Fatty Acids from Fish Oil and Stabilization of the Oil Against Autoxidation." In Flavor and Lipid Chemistry of Seafoods, 255–63. Washington, DC: American Chemical Society, 1997. http://dx.doi.org/10.1021/bk-1997-0674.ch021.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Clejan, Sanda. "HPLC Analytical Methods for the Separation of Molecular Species of Fatty Acids in Diacylglycerol and Cellular Phospholipids." In Phospholipid Signaling Protocols, 255–74. Totowa, NJ: Humana Press, 1998. http://dx.doi.org/10.1385/0-89603-491-7:255.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Maeda, K., H. Enomoto, K. Fukui, and S. Hirota. "Crystallization of a Fatty Acid Mixture Using Spray Evaporation of Highly Volatile Solvents." In Separation and Purification by Crystallization, 220–28. Washington, DC: American Chemical Society, 1997. http://dx.doi.org/10.1021/bk-1997-0667.ch018.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

"Chapter 23: Novel Technology for Essential Fatty Acids: An Experimental Review." In Novel Water Treatment and Separation Methods, edited by S. P. Nayak and S. Singha, 313–30. 6000 Broken Sound Parkway NW, Suite 300 Boca Raton, FL 33487-2742: CRC Press, 2017. http://dx.doi.org/10.1201/9781315225395-28.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

MATSUBA, Y., Y. KITAMURA, and T. TAKAHASHI. "Membrane Extraction for Separation of Long-Chain Unsaturated Fatty Acids." In Solvent Extraction 1990, Part B, 1637–42. Elsevier, 1992. http://dx.doi.org/10.1016/b978-0-444-88677-4.50090-8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Ackman, Robert. "Application of Gas–Liquid Chromatography to Lipid Separation and Analysis." In Fatty Acids in Foods and their Health Implications,Third Edition, 47–65. CRC Press, 2007. http://dx.doi.org/10.1201/9781420006902.ch3.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Fatty acids – Separation"

1

Japir, Abd Al-Wali, Jumat Salimon, Darfizzi Derawi, Murad Bahadi, and Muhammad Rahimi Yusop. "Separation of free fatty acids from high free fatty acid crude palm oil using short-path distillation." In THE 2016 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2016 Postgraduate Colloquium. Author(s), 2016. http://dx.doi.org/10.1063/1.4966739.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Malvestio, A. C., M. Barboza, J. A. C. Leite, and M. Zaiat. "Volatile fatty acids separation by ion exchange chromatography in fixed bed column." In Proceedings of the III International Conference on Environmental, Industrial and Applied Microbiology (BioMicroWorld2009). WORLD SCIENTIFIC, 2010. http://dx.doi.org/10.1142/9789814322119_0050.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Bucy, Harrison, and Anthony J. Marchese. "Oxidative Stability of Algae Derived Methyl Esters Containing Varying Levels of Methyl Eicosapentaenoate and Methyl Docosahexaenoate." In ASME 2011 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/icef2011-60047.

Full text
Abstract:
Microalgae is currently receiving strong consideration as a potential biofuel feedstock to help meet the advanced biofuels mandate of the 2007 Energy Independence and Security Act because of its theoretically high yield (gallons/acre/year) in comparison to current terrestrial feedstocks. Microalgae lipids can be converted into a variety of biofuels including fatty acid methyl esters (e.g. biodiesel), renewable diesel, renewable gasoline or synthetic paraffinic aviation kerosene. For algal methyl ester biodiesel, fuel properties will be directly related to the fatty acid composition of the lipids produced by the given microalgae strain. Several microalgae species under consideration for wide scale cultivation, such as Nannochloropsis, produce lipids with fatty acid compositions containing substantially higher quantities of long chain-polyunsaturated fatty acids (LC-PUFA) in comparison to terrestrial feedstocks. It is expected that increased levels of LC-PUFA will be problematic in terms of meeting all of the current ASTM specifications for biodiesel. For example, it is well known that oxidative stability decreases with increasing levels of LC-PUFA. However, these same LC-PUFA fatty acids, such as eicosapentaenoic acid (EPA: C20:5) and docosahexaenoic acid (DHA: C22:6) are known to have high nutritional value thereby making separation of these compounds economically attractive. Given the uncertainty in the future value of these LC-PUFA compounds and the economic viability of the separation process, the goal of this study was to examine the oxidative stability of algal methyl esters with varying levels of EPA and DHA. Tests were conducted using a Metrohm 743 Rancimat with automatic induction period determination following ASTM D6751 and EN 14214 standards, which call for induction periods of at least 3 hours and 6 hours, respectively. Tests were conducted at a temperature of 110°C and airflow of 10 L/h with model algal methyl ester compounds synthesized from various sources to match the fatty acid compositions of several algae strains subjected to varying removal amounts of roughly 0 to 100 percent LC-PUFA. In addition, tests were also conducted with real algal methyl esters produced from multiple sources. The bis-allylic position equivalent (BAPE) was calculated for each fuel sample to quantify the level of unsaturation. The induction period was then plotted as a function of BAPE, which showed that the oxidative stability varied exponentially with the amount of LC-PUFA. The results suggest that removal of 45 to 65 percent of the LC-PUFA from Nannochloropsis-based algal methyl esters would be sufficient for meeting existing ASTM specifications for oxidative stability.
APA, Harvard, Vancouver, ISO, and other styles
4

Kafuku, Gerald, Makme Mbarawa, Man Kee Lam, and Keat Teong Lee. "Optimized Preparation of Moringa Oleifera Methyl Esters Using Sulfated Tin Oxide as Heterogenous Catalyst." In ASME 2010 4th International Conference on Energy Sustainability. ASMEDC, 2010. http://dx.doi.org/10.1115/es2010-90503.

Full text
Abstract:
Fatty acid methyl esters (biodiesel), prepared from transesterification of vegetable oils or animal fats, have gained great importance in substituting petroleum based diesel for combating environmental problems and higher diesel prices. Moringa oleifera fatty acids are among the newly investigated potentials for biodiesel production in recent years. In getting rid of soap formation and thus large waste washing water from biodiesel produced from homogenous catalysts, the use of heterogeneous catalysts is currently preferred due to easily separation and purification of the final products. In this study, biodiesel was produced from moringa oleifera oil using sulfated tin oxide enhanced with SiO2 (SO42−/SnO2−SiO2) as super acid solid catalyst. The experimental design was done using design of experiment (DoE), specifically, response surface methodology based on three-variable central composite design (CCD) with alpha (α) = 2. The reaction parameters in the optimization process were reaction temperature (60°C to 180°C), reaction period (1 to 3 hrs) and methanol to oil ratio (1:6 to 1:24 mol/mol). It was observed that the yield up to 84wt% of moringa oleifera methyl esters can be obtained with reaction conditions of 150°C temperature, 150 minutes reaction time and 1:19.5 methanol to oil ratio, while catalyst concentration and agitation speed are kept at 3wt% and 350 rpm respectively.
APA, Harvard, Vancouver, ISO, and other styles
5

Liang, Huan, Cheng Yang, and Zhiquan Pan. "NOVEL SULFO FATTY ACID FOR FLOTATION SEPARATION OF CARBONATES AGAINST PHOSPHATE ROCKS." In International Conference on Engineering and Technology Innovations (ICETI). Volkson Press, 2017. http://dx.doi.org/10.26480/iceti.01.2017.33.36.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Serrano Izaguire, Gustavo. "Rapid Separation of Fatty Acid Methyl Esters with a 90-m Cyanopropyl-methylpolysiloxane GC Column." In Virtual 2020 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2020. http://dx.doi.org/10.21748/am20.235.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Wei, Na, Heather Kuiper, Hayoung Kim, Jessica Holmes, and Hubert Vesper. "Separation of Fatty Acid Isomers in Human Plasma by Silver Ion High-performance Liquid Chromatography in Conjunction with Gas Chromatography with Negative Chemical Ionization Mass Spectrometry." In Virtual 2021 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2021. http://dx.doi.org/10.21748/am21.199.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Fatty acids – Separation"

1

Márquez-Ruiz, Gloria. Separation and Quantification of Oxidized Monomeric, Dimeric and Oligomeric Fatty Acids. AOCS, December 2011. http://dx.doi.org/10.21748/lipidlibrary.39201.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Fatty acids – Separation' for particular source types:
Journal articles Dissertations / Theses
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography