Abstract
The characterization by chromatographic (TLC, HPLC) and spectroscopic (visible and mass spectrometric and, in part, 1H NMR, circular dichroism methods) and structural elucidation of 10 minor carotenoids isolated from prasinophytes ( Bathycoccus prasinos, Micromonas pusilla, Mantoniella squamata and a clone IIA2) are reported. These C 40-carotenoids comprise the aldehydes micromonal and anhydromicromonal and the corresponding allylic prim carotenols micromonol and anhydromicromonol, and three natural butenolides derived from uriolide, namely anhydrouriolide, deepoxyuriolide and 3′-dehydrouriolide. In addition there are two prasinoxanthin related carotenoids, anhydroprasinoxanthin with a γ-end group and preprasinoxanthin, as well as a dihydrolutein. Several of the new carotenoids have short chromophores with saturated C-7,8 bond. A C-2,3 double bond is another frequent structural feature.
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