Chemotaxonomic survey of sterols and fatty acids in six marine raphidophyte algae |
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| Authors: | Judith-Anne Marshall Peter D. Nichols Gustaaf M. Hallegraeff |
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| Affiliation: | (1) School of Plant Science, University of Tasmania, Tas, 7001, Australia;(2) CSIRO Marine Research, Hobart, Tas, 7001, Australia |
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| Abstract: | Fatty acid and sterol profiles allowed for clear discrimination betweentheraphidophyte genera Chattonella,Heterosigma, Fibrocapsa andOlisthodiscus, but exhibited little differentiation forindividual Chattonella species(C.marina, C. antiqua and C.subsalsa). Sterol and fatty acid profiles do not support theseparation of Chattonella antiqua and C.marina as distinct species. Ecophenotypic variations in lipidprofiles were also observed between Chattonella strainsfromdifferent geographic locations. Sterol signatures which may be useful aschemotaxonomic markers were: the absence of C27 sterols (cholesteroland 24-dihydrozymosterol) in Heterosigma akashiwo; thepresence of isofucosterol in Chattonella; and theoccurrence of brassicasterol, poriferasterol and fucosterol inOlisthodiscus luteus. High levels of eicosapentaenoic acid(EPA; 17-27% of fatty acids) were present in all raphidophyte species. Lipidcomposition correlated more closely to recent molecular classification ofraphidophytes than carotenoid pigments. |
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| Keywords: | Chattonella antiqua Chattonella marina Chattonella subsalsa Chemotaxonomy Fatty acids Fibrocapsa japonica Heterosigma akashiwo Olisthodiscus luteus Phycotoxins Raphidophytes Sterols |
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