Algal carotenoids 52; secondary carotenoids of algae 3; carotenoids in a natural bloom of Euglena sanguinea |
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Authors: | Merete Grung Synnve Liaaen-Jensen |
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Institution: | Organic Chemistry Laboratories,Norwegian Institute of Technology, University of Trondheim-NTH, N-7034, Trondheim-NTH, Norway |
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Abstract: | Quantitative carotenoid analysis of a natural bloom of Euglena sanguinea Ehrenberg revealed the presence of β,β-carotene (1% of total carotenoids), monoesters of adonirubin (3%), diesters of (3S, 3′R)-adonixanthin (13%), diesters of (3S, 3′S)-astaxanthin (75%), 19-monoester of (3R, 3′R, 6R)-loroxanthin (1%), (3R, 3′R)-diatoxanthin (6%), diadinoxanthin (1%) and neoxanthin (traces). The carotenoid content amounted to 0.7% of the dry wt. Methods employed included TLC, HPLC, VIS, MS, CD and H NMR (400 and 500 MHz). The high content of ketocarotenoids is characteristic of secondary carotenoids produced under stressed growth conditions. Previously secondary carotenoids were associated with green algae (Chlorophyceae), but have now been encountered in Euglenophyceae. |
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Keywords: | Euglenophyceae Euglena sanguinea carotenoid composition ketocarotenoids astaxanthin adonixanthin loroxanthin 19-monoester |
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