Orthogonal Test for Optimization of Rhubarbs Extraction Process and Pharmacodynamic Studies the Extracts / 中药新药与临床药理

ABSTRACT

Objective To optimize the solvent extraction of Rhubarbs. Methods With different concentrations of alcohol as the solvent, the amount of solvent, the extracting time and the extracting frequencies were assayed by orthogonal test to detect their influences on the extraction rate of rhubarb anthraquinone. And the extracts were analyzed and their pharmacodymamic effects were studied. Results Indicated by the content of total anthraquinones, the best conditions was: reflux extraction with 5- fold 50 % alcohol for 3 times, 0.5 h per time. The purgative activity of the extracts was stronger than that in the positive control group. Conclusion Optimization of the extracting conditions can promote the purgative activity of the extracts. 