title: Photocatalytic production and processing of conjugated linoleic acid-rich soy oil.
abstract: Daily intake of conjugated linoleic acid (CLA), an anticarcinogenic, antiatherosclerotic, antimutagenic agent, and antioxidant, from dairy and meat products is substantially less than estimated required values. The objective of this study was to obtain CLA-rich soybean oil by a customized photochemical reaction system with an iodine catalyst and evaluate the effect of processing on iodine and iodo compounds after adsorption. After 144 h of irradiation, a total CLA yield of 24% (w/w) total oil was obtained with 0.15% (w/w) iodine. Trans,trans isomers (17.5%) formed the majority of the total yield and are also associated with health benefits. The isomers cis-9,trans-11 and trans-10,cis-12 CLA, associated with maximum health benefits, formed approximately 3.5% of the total oil. This amount is quite significant considering that total CLA obtained from dairy sources is only 0.6%. ATR-FTIR, 1H NMR, and GC-MS analyses indicated the absence of peroxide and aldehyde protons, providing evidence that secondary lipid oxidation products were not formed during the photochemical reaction. Adsorption processing vastly reduced the iodine and iodocompounds without CLA loss. Photocatalysis significantly increased the levels of CLA in soybean oil.
authors.affiliation: Department of Food Science, University of Arkansas, 2650 Young Avenue, Fayetteville, Arkansas 72704, USA.
authors.forename: Vishal P
authors.initials: VP
authors.lastname: Jain
authors.forename: Andrew
authors.initials: A
authors.lastname: Proctor
mesh_terms: D002384:Catalysis; D008401:Gas Chromatography-Mass Spectrometry; D007455:Iodine / Q000032:analysis / Q000737:chemistry; D007700:Kinetics; D044243:Linoleic Acids, Conjugated / Q000032:analysis* / Q000138:chemical synthesis; D009682:Magnetic Resonance Spectroscopy; D010777:Photochemistry / Q000295:instrumentation*; D013024:Soybean Oil / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D044243:Linoleic Acids, Conjugated; D013024:Soybean Oil; D007455:Iodine