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High trans,trans Conjugated Linoleic Acid-Rich Triacylglyceride Production by Photo-Irradiation

Shah, Utkarsh, Proctor, Andrew, Yettella, Ramesh R.
The journal of the American Oil Chemists' Society 2014 v.91 no.4 pp. 681-686
anticarcinogenic activity, conjugated linoleic acid, diabetes, heart, iodine, isomers, mathematical models, rats, risk factors, soybean oil, United States
Recent studies have shown that a 20 % trans,trans conjugated linoleic acid (CLA)-rich soy oil significantly reduces heart disease and diabetes risk factors in obese rats. Furthermore, trans,trans-CLA has been reported to have superior anti-carcinogenic activity than other CLA isomers. Therefore, a more concentrated source of trans,trans-CLA oil would be highly desirable. The objectives of this study were to (1) determine the yield of trans,trans-CLA isomers resulting from photo-irradiation of Tonalin®(BASF Global, Florham Park, NJ, USA) and identify trans,trans-CLA positional isomers; and (2) derive a mathematical model of kinetics of trans,trans-CLA TAG formation from Tonalin®. Fifty-five percent trans,trans-CLA rich oil was obtained in about 140 min when Tonalin®was photo-isomerized with 0.35 % iodine, which is almost three times more than is possible with photo-isomerized soy oil. Photo-isomerization of Tonalin®requires about 2 h, compared to 12 h for photo-isomerization of soy oil. This reaction is a first-order reversible reaction with the forward rate constant (kf) = 13.17 × 10⁻³min⁻¹and backward rate constant (kb) = 5.334 × 10⁻³min⁻¹. The major isomers identified were trans-9,trans-11- and trans-10,trans-12-CLA.