The Comparison of the Five Kinds of Anthraquinone Derivatives Contents in Rheum tanguticum of Different Growing Periods

OBJECTIVE To investigate variations of anthraquinone derivatives in Rheum tanguticum Maxim.ex Balf.of different growing periods.METHODS The emodin,chrysophanol,rhein,aloe-emodin and physcion in Rheum tanguticum Maxim.ex Balf.of different growing periods w