红石耳多糖的研究

A Study on Polysaccharide of the Hongshier (Umbilicaria hypococcinea)

红石耳用热水提取、乙醇沉淀，精制得UMH多糖，经SephadexG－150柱层析证明为均一性多糖。糖的含量为90．4％，气相色谱检测由葡萄糖（Glc）、甘露糖（Man）。葡萄糖醛酸（GlcA）组成，克分子比为45：1：9，平均分子最为40×104。经高碘酸氧化，Smith降解，红外光谱分析，UMH多糖主要由α（1→6），（1→4）甙键聚合而成的酸性杂多糖。

UMH polysaccharide was isolated and purified with alcohol precipitation from hot water extract of Umbilicaria hypococcinea Liano. By Sephadex G-150 column chromatography, UMH was shown to be a single homogeneous substance, sugar content 90.4%. By gas chromatogra phy analysis, UMH was composed of glucose, mannose and glucuronic aeid, their molecule ratio was about 45:1:9. Its mean molecular weight was estimated to be 40×104. IR analysis Periodate oxidation and Smith degradation showed that the main chain of UMH is composed,of α(1→6) and (1→4) linkage, and was an acidic hetrosaccharide.