Linoleateの酸化に対する魚肉抽出液の促進作用

概要

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The catalytic function of fish muscle extract in linoleate oxidation was examined and compared with those of metmyoglobin (metMb) and FeSO4 as catalyst. The muscle extracts of the four species of fishes examined, namely, big-eye tuna, yellowfin tuna, yellowtail, and sablefish, catalyzed the oxidation of linoleate, those of big-eye tuna and yellowfin tuna being more strongly catalytic than those of yellowtail and sablefish. The oxidation catalyzed by the muscle extract of big-eye tuna was enhanced by ascorbic acid and by cysteine but inhibited by EDTA, a catalytic feature resembling that of FeSO4. However, it could not be deduced that the non-heme iron is the main catalyst in the oxidation induced by the muscle extract since the oxidation catalyzed by the mixture of metMb and bovine serum albumin, which was developed by us as a model system suitable for hemoprotein catalysis, was also inhibited by EDTA. On the contrary, the results obtained with imidazole clearly indicated that the catalytic function of the muscle extract is due in large part to the presence of hemoprotein rather than non-heme iron; imidazole inhibited the oxidation catalyzed by both the muscle extract and metMb but did not influence that catalyzed by FeOS4.
公益社団法人日本水産学会の論文