Objective To study the chemical constituents of flavonoids in pine needles of Cedrus deodara. Methods Flavonoids were isolated and purified from ethyl acetate extract of pine needles by chromatography on silica gel and Sephadex LH-20. Their structures were identified on the basis of spectroscopic analysis and chemical evidence. Results Five flavonoids were isolated and purified. Their structures were identified as cedrusone A (1), myricetin (2), 2R,3R-dihydromyricetin (3), quercetin (4), and 2R,3R-dihydroquercetin (5). Conclusion Compound 1 is a new compound. Compounds 2－5 are isolated from pine needles of this genus for the first time.
LIU Dong-yan, SHI Xiao-feng, WANG Dong-dong, MA Qu-huan, ZHANG Jun-min, LI Chong. A New Flavonoid in Pine Needles of Cedrus deodara[J]. Chinese Herbal Medicines (CHM),2011,3(1):5-6
