首次从中草药龙葵SolanumnigrumL.的稀碱提取液中分离得到2种多糖SNL-3, SNL-4。分别经琼脂糖凝胶电泳、凝胶柱层析法分析, 证实均为单一组分。SNL-3, SNL-4经酸水解、Smith降解、红外等确知, SNL-3由D-木糖(75.7%)、D-甘露糖(9.2%)、D-葡萄糖(4.9%)和D-半乳糖(10.2%)组成, 分子量为23700;SNL-4由D-木糖(89.4%)、D-甘露糖(1.7%)和D-半乳糖(8.9%)组成, 分子量为47700。SNL-3和SNL-4均以1, 3Xyl残基为主连结而成

Water soluble polysaccharides SNL 3, SNL 4 were isolated from Solanum nigrum L.. Each of them was shown to be a single homogeneous component by agarose gel electrophoresis and Sephadex column chromatography. Their molecular weights were respectively estimated to be 23 700 and 47 700. Acid hydrolysis, periodate oxidation, Smith degradation and IR spectroscopic analysis showed that SNL 3 contained D xylose (75 7%), D mannose (9 2%), D glucose (4 9%) and D galactose (10 2%); SNL 4 contained D xylose (89 4%), D mannose (1 7%) and D galactose (8 9%). Both of them were mainly composed of Xy Ⅰ residues via β (1→3) glucosidic linkage.