Abstract
Polar orange pigments were extracted from the cultured cells of marine bacterium strain SD-212 and purified by chromatographic methods. The structures of two new trihydroxy-keto-carotenoids, (2R, 3S, 3'S)-2-hydroxyastaxanthin (1) and (2R, 3S, 3'R)-2-hydroxyadonixanthin (2) were determined by means of spectral methods. Known carotenoids (3S, 2'R, 3'R)-erythroxanthin (3), (2R, 3S, 2'R, 3'S)-2, 3, 2', 3'-tetrahydroxy-β, β-carotene-4, 4'-dione (4), (2R, 3S, 2'R, 3'R)-2, 3, 2', 3'-tetrahydroxy-β, β-caroten-4-one (5), (3S, 3'S)-astaxanthin (6), and (3S, 3'R)-adonixanthin (7) were also isolated.
