Abstract
Mitochondrial preparations from sugar beet leaves are shown to catalyse the aerobic oxidation of the carotenoid glycoside, crocin. This oxidation has maximal activity at pH 3·6 and is different from the oxidation catalysed by chloroplasts which has an optimum near pH 7·5. The oxidation is partially inhibited by a variety of compounds including KCN and is stimulated by 8-hydroxyquinoline. A lipoperoxidase system may be involved but only as a small fraction of the overall activity of the mitochondria. After treatment of the mitochondrial pellet with Triton-X-100 an extract and a residue are obtained, each of which will separately catalyse crocin oxidation. Evidence is presented that this treatment has separated two independent crocin oxidizing systems in the mitochondria.
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