Abstract:
The polysaccharides content in 14 samples of Gastrodia elsta produced in Zhaotong and 3 samples of G. elsta bought outside Yunnan Province was determined by means of applying phenolsulfuric acid method. The absorptiophotometric determinations were carried out at 490nm. There was a linear relationship between the photometric value and the concentration within the scale of 0-112.0μg/mL (r=0.9973). The RSD value of precision test was 0.07%, the RSD value of stability test was 167%, and the recovery rate and its RSD value were 1006%and 1.37% respectively. The results of the study indicated that the determination of polysaccharide contents by phenolsulfuric acid method was simple but accurate, the polysaccharides content in the G. elsta produced in Xiaocaoba Township of Yiliang County, Zhaotong Prefecture was 10.4%-21.6%, which was generally higher than those produced from other regions. The polysaccharides content might be adopted as one of the indexes to identify the quality of G. elsta produces.