high-performance liquid chromatography using a non-aqueous reversed phase with gradient elution on c18 columns is a powerful tool for investigating the carotenoid composition of natural samples , e.g. , flower petals , and for the simultaneous detection of carotenoids of the widest possible polarity range ( xanthophylls , diones , hydrocarbons and carotenoid esters ) .
C0949636
xanthophylls
C0007271
carotenoid