1997 Volume 45 Issue 7 Pages 1225-1227
The structure of a novel purple carotenoid, rhodobacterioxanthin (1), isolated from Rhodobacter capusulatus was determined to be 13-cis-1, 1'-dimethoxy-3, 4, 3', 4'-tetradehydro-1, 2, 1', 2'-tetrahydro-ψ, ψ-caroten-20-al. Compounds 1 showed a strong antioxidant effect on lipid peroxidation induced by a free radical and a singlet oxygen.