铁皮石斛花多糖相对分子质量及其单糖组成的研究

为了明确铁皮石斛花中多糖相对分子质量分布及其单糖组成,该研究采用高效凝胶色谱和柱前衍生UPLC对11个铁皮石斛花样品的多糖进行了相对分子质量及其单糖组成分析,并利用SPSS 19.0软件根据组成的单糖峰面积进行聚类分析,结果表明11个杂交家系铁皮石斛花的粗多糖均分离为三部分(DOP-1,DOP-2和DOP-3),其平均相对分子质量分别为5.53×10~5,3.49×10~5和2.12×10~5。铁皮石斛花多糖主要由葡萄糖、甘露糖、半乳糖、半乳糖醛酸和阿拉伯糖5种单糖组成,其中甘露糖组成比例最高,其与葡萄糖比值为0.302~3.335;不同家系样品多糖中各单糖的相对含量存在一定差异,11个家系按单糖组成及相对含量划分为4类,该研究基本明确了铁皮石斛花中多糖相对分子质量分布及单糖构成,为其资源利用打下基础。

Relative molecular mass and monosaccharide composition of polysaccharide in Dendrobium officinale flowers

In order to provide new information on polysaccharide in Dendrobium officinale flowers,the monosaccharide composition and relative molecular mass distribution of 11 families of flowers were investigated and analyzed by high performance gel filtration chromatography (HPGFC) and pre-column derivatization ultra performance liquid chromatography (UPLC) in this study. Then cluster analysis was carried out for the monosaccharide peak areas by utilizing SPSS 19.0 software. The results showed that the polysaccharides of all the above 11 hybrid families of D. officinale flower were separated into three fractions (DOP-1, DOP-2 and DOP-3) with the average relative molecular mass of 5.53×10⁵, 3.49×10⁵ and 2.12×10⁵. The polysaccharides in 11 different families were mainly composed of glucose, mannose, galactose, galacturonic acid and arabinose; mannose had the highest proportion among them, with mannose/glucose ratio of 0.302-3.335. Additionally, the relative contents of various monosaccharides in different families varied. 11 families of D. officinale flower could be classified into four categories according to their monosaccharide components and relative contents. In this study, the relative molecular mass distribution and monosaccharide composition of polysaccharides in D. officinale flowers were defined, which can provide foundations for its resource utilization.