Heterosigma-Glycolipids i and II, Two new Galactolipids Containing Octadecatetraenoyl and Eicosapentaenoyl Residues, from a Raphidophyte DinoflagellateHETEROSIGMA SP

Abstract

A new galactolipid containing an eicosapentaenoyl (EPA) residue, named heterosigma-glycolipid II (2), was isolated from a cultured raphidophycean dinoflagellate Heterosigma sp., together with another new galactolipid heterosigma-glycolipid I (1). Based on enzymatic hydrolysis using lipase and physicochemical evidence, the structures of heterosigma-glycolipids I (1) and II (2) have been determined as (2fS)-2T,3f-di-0-(6,9,12,15-octadecatetraenoyl)-glyceryl 6D'galactopyranoside and (2'S)-21-0-(6,9,12,15-octadecatetraenoy1)-3f-0-(5,8,11,14,17-eicosapentaenoyl)-glyceryl '-D-galactopyranoside, respectively. © 1989, The Pharmaceutical Society of Japan. All rights reserved.