Search results for "linoleic acid"
showing 10 items of 147 documents
Interactions between volatiles and lipids in complex systems
1998
Partition equilibria of three aroma compounds in three different biphasic systems were studied by a liquid/liquid partition technique to investigate interactions that occur between volatiles and lipids in biphasic solutions. The lipids used were linoleic acid and ricinoleic acid and tetradecane as a model. The three aroma compounds were ethyl acetate, 2,5-dimethylpyrazine, and oct-1-en-3-ol. The results showed that the intermolecular forces involved were weak. Infrared spectroscopy was then performed on binary systems (tetradecane and linoleic acid or aroma compound) and on ternary systems (tetradecane, linoleic acid, and aroma compound) to determine the nature of the interactions. This met…
Veränderungen der Lipide und Fettsäurezusammensetzung im Nierengewebe der Ratte unter dem Einfluß von Rotbarschöl und Cocosfett
1971
80 mannliche Sprague-Dawley-Ratten erhielten uber 4 Wochen eine Diat mit 20% Rotbarschol. In der 5. Woche wurde anstelle des Rotbarcholes eine Diat mit 10% Cocosfett und von der 6. Woche an mit 20% Cocosfett bis zur 27. Woche gegeben. Die Kontrollgruppe erhielt eine Diat mit 4% Fett (Altromin).
Veränderungen der Lipide und Fettsäurezusammensetzung im Herzmuskelgewebe der Ratte unter dem Einfluß von Rotbarschöl und Cocosfett in einem langfris…
1971
80 mannliche Sprague-Dawley-Ratten erhielten uber 4 Wochen eine Diat mit 20% Rotbarschol. In der 5. Woche wurde anstelle des Rotbarscholes 10% Cocosfett und von der 6. Woche bis zur 27. Woche 20% Cocosfett gegeben. Die Kontrollgruppe erhielt eine Standarddiat mit 4% Fett (Altromin).
Conjugated linoleic acid isomers in mitochondria
2002
The beneficial effects exerted by low amounts of conjugated linoleic acids (C222222237) suggest that CLA are maximally conserved and raise the question about their mitochondrial oxidizability. Cis-9,trans-11-C18:2 (CLA1) and trans-10,cis-12-C18:2 (CLA2) were compared to cis-9,cis-12-C18:2 (linoleic acid; LA) and cis-9-C16:1 (palmitoleic acid; PA), as substrates for total fatty acid (FA) oxidation and for the enzymatic steps required for the entry of FA into rat liver mitochondria. Oxygen consumption rate was lowest when CLA1 was used as a substrate with that on CLA2 being intermediate between it and the respiration on LA and PA. The order of the radiolabeled FA oxidation rate was PA >> LA >…
Fatty acid composition of french butters, with special emphasis on conjugated linoleic acid (CLA) isomers
2005
Conjugated linoleic acids (CLA) are fatty acids primarily found in dairy products. These fatty acids may have potential biological properties interesting for human health. Update of French food composition data banks was needed to determine CLA levels in French dairy products and to evaluate CLA intake by the French population. As part of this investigation, we analyzed 54 butters from local producers at different times of the year. The average CLA levels in butter were 0.45 g CLA/100 g butter in winter, 0.58 in spring, and 0.80 in summer. Regional variations of CLA levels in butters were observed from different producing areas in France. Butters from hill and mountain regions, and butters …
Association of liver steatosis with lipid oversecretion and hypotriglyceridaemia in C57BL/6j mice fed trans-10, cis-12-linoleic acid
2003
AbstractConjugated linoleic acids (CLA) have recently been recognized to reduce body fat and plasma lipids in some animals. This study demonstrated that the steatosis accompanying the fat loss induced by trans-10,cis-12-C18:2 (CLA2) and not cis-9,trans-11-C18:2 (CLA1) isomer in C57BL/6j mice was not due to an alteration of the liver lipoprotein production that was even increased. The 3-fold decrease in plasma triacylglycerol contents and the induction of mRNA expression of low-density lipoprotein receptors concomitantly observed in CLA2-fed mice suggested an increase in the lipoprotein clearance at the level of the liver itself. CLA1 feeding produced similar but attenuated effects on trigly…
Geometry of conjugated double bonds of CLA isomers in a commercial mixture and in their hepatic 20∶4 metabolites
1999
Rats were fed a fat-free diet for 2 wk. After this period, while maintaining the animals on the same diet, the rats were given intragastrically 180 mg per day of a mixture of conjugated linoleic acids (CLA) as triacylglycerols. Gas chromatography mass spectrometry (GC-MS) analyses of this mixture, as well as hydrazine reduction and GC-MS and GC-Fourier transform infrared analyses of the resulting monoenes, revealed the presence of two major isomers, the 9c,11t- and the 10t,12c-18:2 accompanied by smaller amounts of the 8t, 10c and the 11c, 13t-18:2 isomers. Minor quantities of cis,cis and trans,trans conjugated isomers also were detected. The total fatty acid methyl esters from the liver li…
A detailed identification study on high-temperature degradation products of oleic and linoleic acid methyl esters by GC–MS and GC–FTIR
2012
GC-MS and GC-FTIR were complementarily applied to identify oxidation compounds formed under frying conditions in methyl oleate and linoleate heated at 180ºC. The study was focused on the compounds that originated through hydroperoxide scission that remain attached to the glyceridic backbone in fats and oils and form part of non-volatile molecules. Twenty one short-chain esterified compounds, consisting of 8 aldehydes, 3 methyl ketones, 4 primary alcohols, 5 alkanes and 1 furan, were identified. In addition, twenty non-esterified volatile compounds, consisting of alcohols, aldehydes and acids, were also identified as major non-esterified components. Furanoid compounds of 18 carbon atoms form…
2021
Gammarid amphipods are a crucial link connecting primary producers with secondary consumers, but little is known about their nutritional ecology. Here we asked how starvation and subsequent feeding on different nutritional quality algae influences fatty acid retention, compound-specific isotopic carbon fractionation, and biosynthesis of ω-3 and ω-6 polyunsaturated fatty acids (PUFA) in the relict gammarid amphipod Pallaseopsis quadrispinosa. The fatty acid profiles of P. quadrispinosa closely matched with those of the dietary green algae after only seven days of refeeding, whereas fatty acid patterns of P. quadrispinosa were less consistent with those of the diatom diet. This was mainly due…
Physiologische Wirkungen und Stoffwechsel dimerer Fettsäuren
1964
Die langfristige Verfutterung von 5% dimeren Fettsauren entspr. rund 1,5 g/kg Korpergewicht (bezogen auf das Endgewicht) ergab toxische Wirkungen: Wachstumsverzogerungen, verschlechterte Futterefficiency, Verschlechterung des Grundumsatzes, Senkung der Korpertemperatur, Storung der Leberfunktion und Ablagerung eines abnormen Pigments im RES und in Organzellen.