By P.J. Scheuer, J. Darias
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Additional info for Marine Natural Products Volume 2: Chemical and Biological Perspectives
1974). Under particular growth and conditions the latter is stated to produce manixanthin (7), which is considered to be 9,9'-di-c/salloxanthin. 4. Dinophyceae The literature covering both the freeliving and the symbiotic dinoflagellates (zooxanthellae) has been reviewed up to 1971 by Goodwin (1971c). The chemistry of dinoflagellate carotenoids has been extensively studied in recent years. The Dinophyceae produce structurally more complex carotenoids than do the three classes so far discussed (see Scheme 9).
S Xanthophyceae Chl. a,c 2 Chlorophyceae Chl. a,b Prasinophyceae Chl. a,b | \ ^ J. ,(T-giyco7 T H. € -cycl. *"" Euglenophyccae X Chl. a,b Scheme 22. Possible events in the evolution of algal chloroplast pigments. Capital letters refer to enzymes required to effect carotenoid transformations in Scheme 20 and Table 2. 42 Synn0ve Liaaen-Jensen €-cyclase requirement (H). Cryptophyceae also contain simple carotenoids but a dominance of acetylenic derivatives (J). Epoxidic carotenoids (K) are rarely encountered in these three lowest algal classes but are present in all the other algal classes.
1974) state that C50 carotenoids are found only in extreme halophiles. , 1972). Glucose (80%) and mannose (20%) were identified after hydrolysis of 5 and 6, revealing that 1 occurs both as the glucoside and the mannoside. Aasen et al. (1969b) isolated neurosporene as a major carotenoid in one yellow halophilic coccus and the mannoside of a methyl apocarotenoate (8) as the main carotenoid in another. The alcohol 9, corresponding to 8, was also present in the two cocci. Regarding the presence of other C4o carotenes in halophilic bacteria Kushwaha et al.