Abstract
Many kinds of salts were antioxidative on the autoxidation of linoleic acid (LA) and linoleic acid hydroperoxide (LAHPO). These effects of salts were the most remarkable at 1M of them. The effect of KI was the strongest among tested salts. LA in KI solution did not absorb any oxygen, and LAHPO in that solution consumed 1/7 of absorbed oxygen by LAHPO in KI free solution, even by additional supply of FeSO4. One mole of LA and LAHPO purified from the above oxidizing mixture consumed 1.76 and 0.78 mole of oxygen, respectively. Besides, the addition I- to LA was not observed by analysis with GLC-MS. Then, LA and KI mixture in methanol was excited with 315 nm wavelength, and the fluorescence peak was observed at 412 nm. Intensity of this peak depended on the concentration of LA. These results supported the possible antioxidation mechanism of KI on the autoxidizing LA involving the complex formed between LA and KI in the solution.
