Direct Conversion of Linoleic Acid over Silver Catalysts in the Presence of H2: An Unusual Way towards Conjugated Linoleic Acids

2005 ◽  
Vol 44 (47) ◽  
pp. 7800-7804 ◽  
Author(s):  
Markus Kreich ◽  
Peter Claus
Keyword(s):  
Linoleic Acid ◽  
Direct Conversion ◽  
Conjugated Linoleic Acids ◽  
Silver Catalysts

scholarly journals Layered Double Hydroxides for the Catalytic Isomerization of Linoleic Acid to Conjugated Linoleic Acids (CLAs)

2019 ◽  
Vol 3 (1) ◽  
pp. 30
Author(s):  
Xavier Cardó ◽  
Pilar Salagre ◽  
Yolanda Cesteros
Keyword(s):  
Linoleic Acid ◽  
Layered Double Hydroxides ◽  
Isomerization Reaction ◽  
Complex Reaction ◽  
Conjugated Linoleic Acids ◽  
Nutritional Properties ◽  
Condensation Products ◽  
Catalytic Isomerization ◽  
Double Hydroxides ◽  
Very High

Several hydrotalcite-type compounds with different divalent (Mg2+, Ni2+, Cu2+, Zn2+) and trivalent (Al3+, Cr3+) cations and different ratio compositions were tested for the isomerization of linoleic acid in order to study their role on the obtention of specific conjugated linoleic acids (CLAs) with anticarcinogenic and nutritional properties. This is a complex reaction due to the high number of possible isomers of linoleic acid together with the significant competition of the isomerization reaction with other secondary undesired reactions. All catalysts showed very high conversions of linoleic acid, but condensation products were mainly obtained, especially for the hydrotalcite-type compounds with higher Mg/Al ratios due to their higher Brønsted basicity and for the catalysts with higher Ni2+ content or with the presence of Cu2+, Zn2+ in the layers because of the influence of the higher acidity of these cations on the Brønsted basicity of the hydroxides. The best results were achieved for the catalysts with Mg/Al ratio around 2.5–3, resulting in 29–38% of selectivity to the identified CLAs.

Synthesis and biological activity of hydroxylated derivatives of linoleic acid and conjugated linoleic acids

2009 ◽  
Vol 158 (1) ◽  
pp. 39-45 ◽  
Author(s):  
Zhen Li ◽  
Van H. Tran ◽  
Rujee K. Duke ◽  
Michelle C.H. Ng ◽  
Depo Yang ◽  
...  
Keyword(s):  
Biological Activity ◽  
Linoleic Acid ◽  
Conjugated Linoleic Acids ◽  
Derivatives Of

Effect of Conjugated Linoleic Acids on Nutritional Status and Lipid Metabolism in Rats Fed Linoleic‐Acid‐Deprived Diets

2019 ◽  
Vol 121 (10) ◽  
pp. 1800362
Author(s):  
Ana Clara Fariña ◽  
Jimena Lavandera ◽  
Marcela Aída González ◽  
Claudio Adrián Bernal
Keyword(s):  
Lipid Metabolism ◽  
Linoleic Acid ◽  
Nutritional Status ◽  
Conjugated Linoleic Acids

Synergetic effect of ruthenium and basicity sites in the Ru–MgAl catalyst for hydrogen-free production of conjugated linoleic acids

RSC Advances ◽  
2015 ◽  
Vol 5 (26) ◽  
pp. 20248-20255 ◽  
Author(s):  
Jiebo Chen ◽  
Xinxiang Chen ◽  
Ying Zheng ◽  
Qinglu Li
Keyword(s):  
Linoleic Acid ◽  
Conjugated Linoleic Acid ◽  
Synergetic Effect ◽  
Oxide Catalysts ◽  
Conjugated Linoleic Acids ◽  
Composite Oxide

A series of Ru–MgAl composite oxide catalysts prepared by calcining the ruthenium grafted hydrotalcite-like precursor at various temperatures were used in the hydrogen-free production of conjugated linoleic acid.

scholarly journals Isolation and Identification of Non-Conjugated Linoleic Acid from Processed Panax ginseng Using LC-MS/MS and 1H-NMR

Separations ◽  
2021 ◽  
Vol 8 (11) ◽  
pp. 208
Author(s):  
Tae-Kyung Kim ◽  
Changsuk Lee ◽  
Taek-Hee Nam ◽  
Yong-Ki Seo ◽  
Kyeong-Soo Kim ◽  
...  
Keyword(s):  
Linoleic Acid ◽  
Linoleic Acid Content ◽  
Conjugated Linoleic Acids ◽  
Isolation And Identification ◽  
Pharmacological Activities ◽  
Chemical Structures ◽  
Liquid Chromatography Tandem Mass ◽  
Unknown Peak ◽  
Black Ginseng ◽  
White Ginseng

Black ginseng exhibits numerous pharmacological activities due to higher and more diverse ginsenosides than unprocessed white ginseng. The ginsenoside derivatives have been investigated in order to determine their chemical structures and pharmacological activities. We found a peak which was increased 10-fold but unidentified in the methanol extracts of a black ginseng product. The unknown peak was tracked and identified as linoleic acid rather than a ginsenoside derivative using liquid chromatography–tandem mass spectrometry (LC-MS/MS) and nuclear magnetic resonance (NMR) spectroscopy. NMR analysis confirmed no presence of conjugated linoleic acids. Ginsenoside profiles and linoleic acid contents in black ginseng products were quantified using LC-MS/MS. Linoleic acid content was more directly proportional to the number of applied thermal cycles in the manufacturing process than any ginsenosides.

Biohydrogenation of linoleic acid and production of conjugated linoleic acids by fractions prepared from bovine rumen fluid

2005 ◽  
Vol 2005 ◽  
pp. 202-202
Author(s):  
A. Dorel ◽  
N. D. Scollan ◽  
M. R. F. Lee ◽  
D. R. Yáñez Ruiz ◽  
C.J. Newbold
Keyword(s):  
Linoleic Acid ◽  
Stearic Acid ◽  
Rumen Fluid ◽  
Vaccenic Acid ◽  
Small Particles ◽  
Conjugated Linoleic Acids ◽  
Intermediate Products ◽  
Ruminant Animal ◽  
Ruminal Biohydrogenation ◽  
Significant Health

Dietary conjugated linoleic acids (CLA) offer significant health benefits for man, and ruminant products are the major dietary sources (Bauman et al., 2001). The synthesis of CLA in the ruminant animal occurs either directly in the rumen or in the tissue from trans -vaccenic acid (TVA), formed primarily as intermediate products of ruminal biohydrogenation of linoleic acid (C18:2) to stearic acid (C18:0). Within the rumen, the pattern of biohydrogenation and the products formed appear to differ between the particle rich and the liquid fractions of the rumen (Singh and Hawke, 1979), with biohydrogenation occurring primarily on small particles. The aim of this study was to investigate whether the pattern of CLA and TVA formation differs in these fractions.

scholarly journals Conjugated Linoleic Acid Production by Bifidobacteria: Screening, Kinetic, and Composition

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Stefano Raimondi ◽  
Alberto Amaretti ◽  
Alan Leonardi ◽  
Andrea Quartieri ◽  
Caterina Gozzoli ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Linoleic Acid ◽  
Spectrophotometric Assay ◽  
Geometric Isomers ◽  
Conjugated Linoleic Acids ◽  
Esterified Fatty Acids ◽  
Plasmatic Membrane ◽  
Hydratase Activity ◽  
First Time ◽  
Producer Strains

Conjugated linoleic acids (CLA) are positional and geometric isomers of linoleic acid involved in a number of health aspects. In humans, CLA production is performed by gut microbiota, including some species of potential probiotic bifidobacteria. 128 strains of 31Bifidobacteriumspecies were screened with a spectrophotometric assay to identify novel CLA producers. Most species were nonproducers, while producers belonged toB. breveandB. pseudocatenulatum. GC-MS revealed that CLA producer strains yielded 9cis,11trans-CLA and 9trans,11trans-CLA, without any production of other isomers. Hydroxylated forms of LA were absent in producer strains, suggesting that the myosin-cross-reactive antigen (MCRA) protein that exerts hydratase activity is not involved in LA isomerization. Moreover, both CLA producer and nonproducer species bear a MCRA homologue. The strainB. breveWC 0421 was the best CLA producer, converting LA into 68.8% 9cis,11trans-CLA and 25.1% 9trans,11trans-CLA. Production occurred mostly during the lag and the exponential phase. For the first time, production and incorporation of CLA in biomass were assessed.B. breveWC 0421 stored CLA in the form of free fatty acids, without changing the composition of the esterified fatty acids, which mainly occurred in the plasmatic membrane.

Sign in / Sign up

Export Citation Format

Share Document