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Analysis of carotenoid species in E. gracilis with HPLC. a HPLC chromatogram (445 nm) of extracts from E. gracilis. (Inset) The same chromatogram with an expanded y axis. mAU, milli-absorbance units. b Absorbance spectrum of individual peaks of major carotenoids (peaks 1–6 and 9). 1, neoxanthin; 2, diadinoxanthin; 3, all trans-diatoxanthin; 4–6, cis-diatoxanthin; 7, chlorophyll b; 8, chlorophyll a; 9, β-carotene
