5.3.99.8 physiological function capsanthin-capsorubin synthase catalyzes the conversion of antheraxanthin and violaxanthin into capsanthin and capsorubin, respectively.The orange color of tiger lily flowers is due, primarily, to the accumulation of the two kappa-xanthophylls, capsanthin and capsorubin 728460 5.3.99.8 physiological function the enzyme regulates the red color in pepper fruits 747423 5.3.99.8 physiological function the enzyme regulates the synthesis of capsanthin and the development of red coloration in pepper fruits 748870