血合肉のエキス成分組成

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Extractive nitrogenous constituents of dark muscles were determined in 13 species of fish having deep-seated dark muscle (skipjack, frigate mackerel), fin dark muscle (blow fish, surgeon fish) and superficial dark muscle (nine other species) and compared them with those of white muscles.The concentration of total extractive nitrogen and creatine were high in the dark muscle as compared with the white muscle. Of the ninhydrin positive substances, taurine concentration was much higher in the dark muscle than in the white muscle, and His, Ala, Lys and Glu were also high in the dark muscle. But His was higher in concentration in the white muscle of pelagic fishes, Except in larval fish, taurine content in the dark muscle of the common mackerel did not vary according to body weight or lipid content. Using chromatography for determining the ninhydrin positive substance in the dark muscle, a few unidentified peaks appeared near the taurine peak. Trimethylamine concentration was higher in dark muscle. But the volatile basic nitrogen concentration was less in the dark than in the white muscle. The total amount of nucleotides and related compounds was less in dark muscle than in white muscle. But the ratio of nucleotides to the total extractive nitrogen was larger in the dark than in the white muscle. Therefore, it was thought that no difference in quantity of nitrogen was found between the two kinds of muscles. However, constitutively, there was large difference in the inosin monophosphate concentration in the dark muscle than the white muscle.

血合肉のエキス成分組成

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