Characterization and singlet oxygen quenching activity of (3R)-3-hydroxy-4-ketotorulene and (3R)-3-hydroxy-4-keto-γ- carotene from the yeast Xanthophyllomyces dendrorhrous

Abstract

Structures of (3R)-3-hydroxy-4-ketotorulene (1) and (3R)-3-hydroxy-4-keto-γ-carotene (2) isolated from the yeast Xanthophyllomyces dendrorhrous were fully characterized by FAB MS, 1H NMR, 13C NMR and CD spectroscopic data. Both 1 and 2 showed potent singlet oxygen ( 1O 2) quenching activity as that of astaxanthin and lycopene, which were well known strong 1O 2 quencher. © 2012 by Japan Oil Chemists' Society.