From the yellow petals of rape (Brassica napus) five major carotenoids have been isolated. Based on UV/NIS, CD, 400-MHz 1H-NMR, and mass spectra, they were identified as (9'Z)-neoxanthin, (all-E)- and (9Z)-violaxanthin, and (8'R)- and (8'S)-luteoxanthin.
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Debrunner et al. (1991) studied this question.