枸杞子活性多糖的研究

目的　对4个均一枸杞多糖：LBP1a-1,LBP1a-2,LBP3a-1和LBP3a-2进行结构研究和药理评价。方法采用凝胶柱色谱、酸水解、过碘酸氧化和波谱学等方法测定多糖样品的分子量、单糖组成及连接方式，并以小鼠脾淋巴细胞增殖反应为免疫活性指标对多糖样品进行活性评价。结果　4个多糖样品的分子量分别为11.5×10⁴,9.4×10⁴,10.3×10⁴，8.2×10⁴，LBP1a-1,LBP1a-2为1，6连接的葡聚糖；LBP3a-1,LBP3a-2具有1，4连接的多聚半乳糖醛酸主链，及微量的半乳糖和阿拉伯糖分支。4个多糖均具有免疫促进作用。结论　4种多糖首次从枸杞子中分离得到，具有1，4连接多聚半乳糖醛酸主链结构的多糖活性较强。

STUDIES ON THE ACTIVE POLYSACCHARIDES FROM LYCIUM BARBARUM L.

AIM: To investigate the structures and immunomodulation activity of four homogeneous polysaccharides: LBP 1a-1, LBP 1a-2, LBP 3a-1 and LBP 3a-2 isolated from Lycium barbarum L. brought from Zhongning County, Ningxia Province. METHODS: Their molecular weights, sugar component (constituents) and their linkages were determined by gel permeation chromatography, acid hydrolysis, periodate oxidation and NMR spectrum. The activity of immunomodulation was evaluated with splenocyte proliferation by [3H]-TDR incorperation, in vitro. RESULTS: Four polysaccharides with molecular weights 11.5 x 10(4), 9.4 x 10(4), 10.3 x 10(4) and 8.2 x 10(4), were shown to enhance splenocyte proliferation induced by ConA. LBP 1a-1 and LBP 1a-2 were alpha-(1-->6)-D-glucans. LBP 3a-1 and LBP 3a-2 were found to be a-(1-->4)-D-polygalacturonans. CONCLUSION: The four polysaccharides were first isolated from this plant. Polysaccharides with main chain of alpha-(1-->4)-D-polygalacturonans showed stronger immunomodulation activity.