ビタミンA油の生物効力(マレイン価)の採取法による変化

概要

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Much attention has been given to the occurrence of unhindered isomers of vitamin A in fish oils, since conventional chemical and spectrophotometric procedures yielded erronously high values when applied to the fish liver oil. Present paper deals with the isomerization of vitamin A during the extraction of oil from shark (Carcharhinus gangeticus) liver. Relative biological potency and maleic value were measured by the AMES et al's method. Vitamin A in shark liver is isomerized during the extraction of liver oil. The increase in maleic value caused by isomerization is different according to the extraction methods, and a principal factor for isomerization is thermal treatment during the extraction. The relative biological potencies of shark liver oil just after the extraction were 91.63 by alkali-digestion after autolysis, and 99.10 by enzyme-digestion. These values are not so low as expected. It seems to be possible that isomerization takes place during the storage of liver oil and by molecular distillation of it, so not only the improvement of extraction method, but also the appearance of an inhibitor against isomerization is urgently required.
社団法人日本水産学会の論文