Abstract: To optimize the extraction technology of Rehmannia glutinosa polysaccharide and catalpol from Radix Rehmanniae simultaneously,a single factor test and orthogonal test were used in this experiment.Content of Rehmannia glutinosa polysaccharides and catalpol were determined by phenol-sulfuric acid method and HPLC,respectively.The yields of Rehmannia glutinosa polysaccharide and catalpol were used as the evaluating parameters,and the effects of the solid to liquid ratio,extraction temperature and extraction time on the yield were examined.The optimum extraction technological parameters were as follows:solid to liquid ratio was 1:8,the extraction time was 1.5 h,and the extraction temperature was 90 ℃.This technique was stable and feasible,and was appropriate for industrial production,and would provide references for the development and utilization of new veterinary drugs.

Key words: Rehmannia glutinosa polysaccharide; catalpol; extraction technology