Vegetable oils conjugated linoleic acids

About one-fourth of the TFAs in ruminant fat is represented by RA, which is by far the predominant natural isomer of conjugated linoleic acid (CLA). The remaining TFAs are mainly trans monounsaturated acids of which vaccenic acid (VA /ra/iv-11-Cisi) is predominant. On the other hand, hydrogenated vegetable oils contain predominantly elaidic acid (trans-9-Ci8 i) and have a more even distribution of the other trans-C n acids, but contain little or no RA (Parodi, 2004). 

The trans isomers of octadecenoic acid such as elaidic acid are known inhibitors of A6 desaturase. Elaidic acid is usually formed during the hardening process of vegetable oils. Unfortunately, this acid is considered to be a hypercho-lesterolemic fatty acid (14). Conjugated linoleic acid (CLA), found in dairy products, is a trans-cis isomer of octadeca-dienoic acid. CLA has been shown to downregulate the metabolism of LA (15,16). CLA also reduces production of eicosanoids in several tissues (Fig. 3). The 9c,lU-isomer of conjugated linoleic acid appears to inhibit, whereas the 10Ll2c-isomer stimulates eicosanoid production in human saphenous vein endothelial cells (16). 

Conjugated Linoleic Acids and Conjugated Vegetable Oils... 

Juaneda, P., Cordier, O., Gregoire, S., and Sebedio, J.-L. (2001) Conjugated Linoleic Acid (CLA) Isomers in Heat-Treated Vegetable Oils, Oleagineux Corps Gras Lip ides 8,94-97. 

Metal Nanoparticles for Catalysis Advances and Applications 18 Heterogeneous Gold Catalysts and Catalysis 19 Conjugated Linoleic Acids and Conjugated Vegetable Oils 20 Enantioselective Multicatalysed Tandem Reactions... 

RP-HPLC with nonaqueous solvents and UVD at 246 nm was developed for the determination of low level POVs of vegetable oils. These measurements are specific for conjugated diene peroxides derived from vegetable oils with relatively high linoleic acid content. These measurements may be supplemented by nonspecific UVD at 210 nm and ELSD for detection of all eluted species. The elution sequence of the triglycerides in a nonaqueous RP-HPLC is linearly dependent on the partition number of each species, Vp, which is defined as = Nq — 2Ni, where Nq is the carbon number and is the double bond number. In the case of hydroperoxides = Nq — 2Nd — Vhpo, where Vhpo is the number of hydroperoxyl groups in the molecule (usually 1 for incipient POV). For... 

Conjugation of Linoleic Acid and Vegetable Oils Rich in Linoleic Acid... 

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