スジアオノリ中のステロ-ル,炭化水素,脂肪酸およびフィト-ル画分の季節的変動〔英文〕

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The present paper describes the seasonal variation of constituents such as sterol, hydrocarbon, higher fatty acid, and phytol fractions from Enteromorpha prolifera (MÜLLER) J. AGARDH (Chlorophyceae) which grow profusely at tidal zone in the Seto Inland Sea of Japan. E. prolifera is characterized by higher contents of 28-isofucosterol (Z-24-ethylidene-cholest-5-en-3β -ol) as the major component in the sterol fraction throughut the year. This content increeased to its maximum level level in the winter months (propagative season) and then gradually decreased to its minimum level in the early spring months when the alga was at the mature stage. The contents of 24-methylenecholesterol (24-methylenecholest-5-en-3β -ol) and cholesterol (cholest-5-en-3β -ol) were consistently low in all seasons. cis-7-Heptadecene was characteristically present in apreciable amounts, along throughout the year with lower contents of n-eicosane and phytol The C18-unsaturated fatty acids were the major components in the higher fatty acid fraction in allseasons. These contents increased to the maximum levels in the early spring months (decay season).
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