Abstract
The carotenoids of the photosynthetic dinofiagellates Amphidinium carterae (two strains), Glenodinium sp., Gymnodinium splendens, G. nelsoni and Gyrodinium dorsum have been investigated, quantitatively and qualitatively. Peridinin is the principal carotenoid in all species; also present are β-carotene, diadinoxanthin, dinoxanthin, pyrrhoxanthin, astaxanthin, peridininol, diatoxanthin and pyrrhoxanthinol. New structures have been assigned to dinoxanthin and pyrrhoxanthin while peridininol and pyrrhoxanthinol are new carotenoids not previously reported. A carotenoid glycoside, P-457, found in four species, is a hexoside. Dinoxanthin is the only, plausible biosynthetic precursor of peridinin that could be detected.
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