Antioxidant activity of beta-carotene-related carotenoids in solution.
The effect of the antioxidant activity of beta-carotene and related carotenoids on the free radical-oxidation of methyl linoleate in solution was examined by measuring the production of methyl linoleate hydroperoxides. Canthaxanthin and astaxanthin which possess oxo groups at the 4 and 4'-positions in the beta-ionone ring retarded the hydroperoxide formation more efficiently than beta-carotene and zeaxanthin which possess no oxo groups. The rates of autocatalytic oxidation of canthaxanthin and astaxanthin were also slower than those of beta-carotene and zeaxanthin. These results suggest that canthaxanthin and astaxanthin are more effective antioxidants than beta-carotene by stabilizing the trapped radicals.
Research Institute for Food Science, Kyoto University, Uji, Kyoto 611, Japan.
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D000975:Antioxidants; D002338:Carotenoids; D066298:In Vitro Techniques; D008041:Linoleic Acids; D008054:Lipid Peroxides; D010084:Oxidation-Reduction; D013329:Structure-Activity Relationship
D000975:Antioxidants; D008041:Linoleic Acids; D008054:Lipid Peroxides; C005575:methyl linoleate; D002338:Carotenoids