牛膝多糖的提取纯化工艺研究

目的:研究牛膝多糖的提取、纯化工艺。方法:采用水煎煮法提取牛膝药材,得粗多糖,经脱蛋白、脱盐和醇沉3步纯化,制备牛膝多糖。以总多糖含量为指标,优选最佳提取纯化工艺。结果:水煎煮的最佳工艺为10倍量水,提取3次,每次2h;脱蛋白工艺中,三氯乙酸(TCA)法优于Sevage法和鞣酸法;脱盐工艺中,分子筛法优于透析法;醇沉使用80%的乙醇。结论:以水煎煮法提取,经脱蛋白、脱盐和醇沉工艺得到的牛膝多糖中总多糖含量及其纯度均较高,可为其药理及制剂研究提供原料。

Study on the Extracting and Purifying Process of Achyranthes Bidentata Polysaccharides

OBJECTIVE:To study the extracting and purifying process of Achyranthes bidentata polysaccharides(ABP). METHODS:Crude polysaccharide was obtained by extracting ABP raw material by water decocting method.The Crude polysaccharide was purified(deproteinization,desalination and alcohol precipitation) to obtain ABP.The content of total polysaccharide was taken as an evaluation index to optimize the optimum conditions of extracting and purifying.RESULTS: The optimum water decoction conditions were as follows:ABP raw material was extracted three times (2 h/time) by adding 10 times amount of water.As for the deproteinization process,TCA(trichloracetic acid) method was superior to Sevage method and tannic acid method;Desalination by molecular sieve was superior to that by dialysis method; and alcohol precipitation was performed with 80% alcohol.CONCLUSION:ABP can be prepared by water decoction,deproteinization,desalination and alcohol precipitation of its raw material.