海洋性小型歯鯨アラリイルカの乳中の脂肪酸〔英文〕

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The composition and quantity of free short-chain acids in the milk of whales Stenella attenuata and the composition of short-and long-chain acids in their milk lipids were studied. The content of lipids in the milk was about 19.7%, the REICHERT-MEISSL value about 6.1, and the content of free short-chain acids about 3.1 meq/l. Acetic, propionic, isobutyric, isovaleric, and n-enamthic acids were usually present in free form. Acetic acid was the most dominate, followed by n-enanthic and isovaleric acids. Other acids were detected in trace amounts. A series of short-chain straight acids from acetic acid to n-capric acid and a series of short-chain branched acids from isobutyric acid to isoenanthic acid were usually detected in milk lipids. Generally, actic acid was the most abundant, the straight-chain acids from proponic acid to n-capric acid were present in nearly equal amounts, but branched-chain acids were few. Long-chain branched acids in milk lipids were also prewent only in small amounts. Iso-17:0 acid showed the maximum concentration among the odd-numbered iso acids and iso-18:0 acid among the even-numbered iso acids. Few anteiso acids and few iso acids with carbon number lower than 13 were detected.
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