| Riassunto: | Effect of 0, 200, 400, 600, 800 and 1000 ppm (wt/vol) quercetin on the erythrosine sensitized photooxidations of palm oil and linoleic acid in methylene chloride containing 100 ppm erythrosine, were studied during storage under 4000 lux fluorescent light for 5 h by measuring peroxide value. Steady-state kinetic approximation was used to determine a quenching mechanism and quenching rate constant of quercetin in the erythrosine-sensitized photooxidation of palm oil and linoleic acid in methylene chloride model system. Erythrosine greatly increased the photooxidation of palm oil and linoleic acid, as was expected. Quercetin was extremely effective
in minimizing erythrosine-sensitized photooxidation of palm oil and linoleic. As the concentration of quercetin increased from 0 to 200, 400, 600, 800 and 1000 ppm, the peroxide values of palm oil and linoleic acid decreased significantly (P < 0.05). The steady-state kinetic studies indicated that quercetin quenched singlet oxygen only to minimize the erythrosine- sensitized photooxidation of palm oil and linoleic acid. The calculated total quenching rate of quercelin on erythrosine photosensitized oxidation of palm oil in methtylene chloride was 4.3 x 109 AI's-1 and total quenching rate of quercetin on erythrosine
photosensitized oxidation of linoleic acid in methtylene chloride was 3.2 x 109M-'s-'.
Keywords: Quercetin, photosensitized oxidation, singlet oxygen, palm oil and linoleic acid.
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