Oxidative Stability of Conjugated Linoleic Acid Rich Soy Oil Obtained by Heterogeneous Catalysis

Abstract

A CLA rich-soy oil (CLARSO) has been produced by heterogenous catalysis. This oil may provide significant health benefits. The objectives of this study were: to determine the oxidative stability of the CLARSO and CLARSO after adsorption treatment [1], relative to conventional soy oil, in terms of primary and secondary oxidation products and to determine CLA and other unsaturated fatty acids oxidation kinetics in the CLARSO [2]. Primary and secondary oxidation products were measured in CLARSO and soy oil samples kept at 50 °C in the dark. The CLARSO was less stable than soy oil but bleaching improved its oxidative stability. The induction times were dependent on the analytical method used. Fatty acid oxidation kinetics was determined by measuring each fatty acid and hydroperoxides in CLARSO at 52, 61 and 69 °C in the dark. Unsaturated fatty acids oxidation rate constants, activation energies and frequency factors were obtained by the Arrhenius equation. Kinetics studies showed that CLA isomers had higher rate constants, higher activation energies and higher frequency factors than linoleic acid which showed that the CLA isomers had more molecular collisions with oxygen than linoleic acid.

Impact of winterization on fatty acids' composition, isomers, and oxidative stability of conjugated linoleic acids produced from selected vegetable oils

“…It is reported in the literature that CLAs are more prone to lipid oxidation and analysis on GC-Head space showed that after 3 days of storage of 10% and 20% soybean oil derived CLAs at 65°C decreased by 9.5% and 11.5%, respectively. Supplement having higher extent of CLAs was found to be more susceptible to auto-oxidation (Yettella et al, 2012).…”

Experimental and theoretical study of the influence of water on hydrolyzed product formation during the feruloylation of vegetable oil

“…Vegetable oils (as well as fruit oils) and plant extracts are major sources of green cosmeceuticals, which comprise an established area of products for those who wish to age naturally and healthily . The pharmacological effects of bioactive oils can be enhanced through the rational modification of the oils to bioproducts with beneficial functional groups . These intentional and unintentional transformations of vegetable oils provide value added bioproducts and govern product quality .…”