关键词: 棠梨叶, 总多糖, 苯酚硫酸法, 含量测定

Abstract:

         We determined polysaccharides content of two manufactures from the leaves of Pyrus betulaefolia Bge. using phenolvitriol method.With the contrast, glucose, we measured their absorbency at the wavelength of 490 nm. A good linear relationship exists between the absorbency and the determined content in the range of 0.01968 ～0.0984 mg. Recovery experiment indicates that the average recovery rate is 99.02 % (n=5) and that RSD is 3.34 %. Determination results of total polysaccharide contents from different processes are 7.82% for that prepared by the traditional process of drying by sun and dewing in night and 5.27% for that prepared by sunbaked till to red after humidity accumulation. Experimental results show that the content of total polysaccharide in the leaves of P. betulaefolia Bge. is high. It can therefore be utilized as a total polysaccharide rich medical resource.

Key words: leaves of Pyrus betulaefolia Bge., total polysaccharide, method of phenolvitriol, content determination