Diapolycopenedioic acid xylosyl ester, a novel glyco-C30-carotenoic acid produced by a new marine bacterium Rubritalea squalenifaciens

A novel acyl glyco-carotenoic acid, diapolycopenedioic acid xylosyl ester, was isolated from a marine bacterium Rubritalca squalenifaciens belonging to subdivision I of Verrucomicrobia as the major red pigment by using chromatographic methods. The structure of diapolycopenedioic acid xylosyl ester was determined to be 4-[2-0-(12-methyltridecanoyl)-P-xylopyranosyl] hydrogen 4,4'-diapo-psi,psi-carotene-4,4'-dioate by analysis of the MS and NMR data for this acid and for the diacetyl diapolycopenedioic acid xylosyl ester. The diapolycopenedioic acid xylosyl ester showed potent antioxidative activity against a lipid peroxidation model. (c) 2007 Elsevier Ltd. All rights reserved.