Sulfoglycolipid from the marine brown alga Sargassum hemiphyllum

One kinds of glycolipid (SBI) have been isolated from the marine brown alga Sargassum hemiphyllum (Turn.) Ag. The structures of SBI have been determined as the sodium salt of 1-0-acyl-3-0-(6 ' -sulfo-alpha -D-quinovopyrannosyl glycerol (acyl: tetradecanoyl, pentadecanoyl, 11-hexadecenoyl, hexadecanoyl, 10,13-octadecadienoyl, 9-octade cenoyl, 15-metylheptadecanoyl and 11-eicosenoyl 17:1.5: 19:153:1 :19:1:2) on the basis of chemical and spectral evidence and GC-MS analysis, respectively. Four constituents of the SBI were new compounds [the sodium salt of 1-0-(11 " -hexadecenoyl)-3-0-(6 " -sulfo-alpha -D-quinovopyrannosyl) glycerol, the sodium salt of 1-0-(10 " ,13 " -octadecadienoyl)-3-0-(6 ' -sulfo-alpha -D-quinovopyrannosyl) glycerol, and the sodium salt of 1-0-(15 " -metylhexadecenoyl) -3-0-(6 ' -sulfo-alpha -D-quinovopyrannosyl) glycerol, and the sodium salt of 1-0-(11 " -eicosenoyl)-3-0-(6 ' -sulfo-alpha -D-quinovopyrannosyl) glycerol]. All compounds were isolated from marine brown alga for the first time.