不同来源、不同等级猪苓饮片中总多糖的含量测定

目的:建立猪苓饮片总多糖的含量测定方法,分析不同来源、不同等级猪苓饮片中的总多糖含量,为制定猪苓饮片含量限度及饮片商品等级划分标准提供参考依据。方法:采用高效凝胶色谱法-示差折光-多角度激光检测器联用技术测定猪苓多糖的相对分子质量及其分布情况,选择与总多糖相对分子质量相近的葡聚糖为对照品,采用正交试验和单因素试验优化猪苓总多糖含量测定的前处理条件,采用蒽酮-硫酸显色法,在630 nm处测定13批不同产地猪苓饮片和39批不同等级猪苓饮片中总多糖的含量。结果:含量测定方法学考察的线性关系、稳定性、精密度、重复性及加样回收率结果均符合要求。不同产地猪苓饮片中总多糖的质量分数在0. 87%～1. 39%。不同等级猪苓饮片中总多糖质量分数为一等饮片1. 40%,二等饮片1. 21%,三等饮片1. 03%。结论:建立的含量测定方法灵敏度高、重复性好,可用于猪苓饮片的总多糖含量测定。不同来源的猪苓饮片总多糖含量有一定差异。不同等级猪苓饮片总多糖含量呈现一定的规律性,一等饮片中总多糖含量最高,二等饮片总多糖含量次之,三等饮片总多糖含量最低,对于制定猪苓饮片含量限度及饮片商品等级划分标准具有重要参考价值。

Determination of Total Polysaccharides in Decoction Pieces of Polyporus with Different Sources and Different Grades

Objective: To establish a method for determining the content of total polysaccharides in decoction pieces of Polyporus,analyze the content of total polysaccharides in samples with different sources and grades. Method: The relative molecular weight and the polydispersity index of polysaccharides in decoction pieces of Polyporus were measured by a high performance gel chromatography coupled with a multi-angle laser light scattering and refractive index system.Dextran with similar molecular weight as polysaccharides was selected as the reference substance.Orthogonal experiment and single factor tests were used to optimize the pretreatment conditions for the determination of total polysaccharides in Polyporus.Polysaccharides in Polyporus with different areas and grades were determined by anthrone-sulfuric acid colorimetric method at 630 nm. Result: The linearity,stability,precision,repeatability and recovery rate of the established method all reached the standards,respectively.The content of total polysaccharides in samples from different areas ranged from 0.87% to 1.39%.The content of total polysaccharides in samples with different grades was 1.40% for first-grade pieces,1.21% for second-grade pieces, and 1.03% for third-grade pieces. Conclusion: The established method is simple,accurate and reproducible,and it can be used for the determination of polysaccharides in decoction pieces of Polyporus.The content of polysaccharides in samples from different origins varies greatly.The content of polysaccharides in samples with different grades shows a certain regularity.The content of polysaccharides is the highest in the first-grade pieces,followed by the content in the second-grade,and the lowest in the third-grade.The results can provide a reference for formulating limits for the content of total polysaccharides and the grade standard of decoction pieces of Polyporus.