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PJB-1991-6
PHYCOCHEMICAL EXAMINATION OF HYPNEA VALENTIAE (GIGARTINALES, RHODOPHYTA)
Abstract
Investigation of the methanolic extract of Hypnea valentiae (Turner) Montagne, collected from Karachi, Pakistan, afforded seven sterols, a fatty acid derivative and 12 fatty acids. Study of the sterol fraction through 1H and 13C NMR and mass spectrometry exhibited the occurrence of 22-dehydrocholesterol, desmosterol , 24- methylene cholesterol, 24-metyl cholesterol, Nor 31-cycloartanol and cycloartanol as well as a fatty acid derivative, 7-hhydroxy tetradec-4-enoic acid. In the lipid fraction 9 saturated fatty acid methyl esters viz., myristate, pentadecylate, palmitate, margarate, stearate, nonadecylate,
