Abstract
The sugar moiety bound to myxol in Oscillatoria agardhii was shown by 1H NMR (400 MHz) experiments and glycoside hydrolysis to be α-linked chinovose, tentatively with the L-configuration. Direct comparison of 100 MHz 1H NMR spectra of the acetates of myxol α-chinovoside and of oscillaxanthin ex Arthrospira sp. suggests the same sugar component in oscillaxanthin, and also in myxoxanthophyll from the latter source. The O-methyl methylpentoside bound to myxol in O. bornetii f. tenuis was identified by 1H NMR as α-linked 3- O-methyl-fucose, tentatively L-configurated. The differentiation of species in the genus Oscillatoria, causing natural blooms in eutrophic lakes, was supported by their carotenoid pattern when including the differences in sugar moiety of the carotenoid glycosides.
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