川、黔地区金钗石斛多糖的含量测定

目的:比较川、黔金钗石斛中有效成分多糖的含量,建立金钗石斛中多糖的含量测定方法。方法:采用水提醇沉法提取金钗石斛多糖,以葡萄糖为对照品,在紫外检测波长490nm处用苯酚-硫酸法测定不同产地金钗石斛中多糖的含量。结果:金钗石斛多糖的检测浓度在1.25～8.75μg·mL-1范围内与吸光度呈良好线性关系(r=0.9994)。贵州赤水金钗石斛的平均回收率为101.6%,RSD=1.9%(n=6),多糖含量为11.456%;四川合江金钗石斛的多糖含量为9.226%。结论:苯酚-硫酸法操作简便、可靠、准确、灵敏、稳定性好,适用于金钗石斛中多糖的含量测定。在川、黔地区金钗石斛多糖提取生产过程中,可优先选用贵州赤水金钗石斛。

Content Determination of Polysaccharide from Dendrobium nobile Cultivated in Guizhou and Sichuan

OBJECTIVE：To compare the content of polysaccharide from Dendrobium nobile cultivated in Guizhou and Sichuan,and to establish content determination method of polysaccharide from D.nobile.METHODS：Polysaccharide was extracted from D.nobile using water extraction alcohol precipitation.The content of polysaccharide from D.nobile cultivated in different areas was determined by phenol-sulfuric acid method with glucose as standard substance at UV wavelength of 490 nm.RESULTS：The linear range of polysaccharide from D.nobile was 1.25～8.75 μg·mL^-1（r=0.999 4）.The average recovery of D.nobile cultivated in Chishui of Guizhou province was 101.6%（RSD=1.9%,n=6）,and the content of polysaccharide was 11.456%;the content of polysaccharide from D.nobile cultivated in Hejiang of Sichuan province was 9.226%.CONCLUSIONS：Phenol-sulfuric acid method is simple,reliable,accurate,sensitive and stable for the content determination of polysaccharide from D.nobile.D.nobile cultivated in Chishui of Guizhou province is the best choice for the extraction of polysaccharide from D.nobile.