米糠半纤维素B的分离和鉴定

Isolation and Identification of Rice Bran Hemicellulose B

由脱脂米糠细胞壁物质碱提分离出半纤维素B，其单糖组成为阿拉伯糖（22．1）、木糖（54．5）、葡萄糖（10.1）和半乳糖（13．4）．结合蛋白的氨基酸组成同游离米糠蛋白有较大差异，半纤维素B主要由50万、3万和1.1万三个分子量组分组成．并发现，碱提浓度和温度过高会对其产生裂解作用．

Rice bran hemicellulose B was isolated from defatted rice bran cell walls. Its simple sugar consists of arabinose, xylose, glucose and galactose with a proportion of 22.1 f 54.5:10.1 : 13.4. The amino acid composition of its glycoproteins was quite different from that of free rice bran protein. The molecule weight of hemicellulose B mainly comprised 500,000, 30,000 and 11,000.We also found that hemicellulose B would be partly fractured if the concentration of temperature of alkali was high.