中文摘要：

本研究从钝顶螺旋藻中分离纯化了酸性多糖，并进行了结构分析。多糖经DEAE－纤维素柱和Sephadex－200凝胶柱纯化得到螺旋藻酸性多糖纯品，HPLC检测纯度达96．7％，分子量均～，约1．62×10^5。TLC和GC分析表明该多糖主要由D－鼠李糖、D－木糖、D－葡萄糖和D-甘露糖醛酸构成，摩尔比为65．5：19．5：9：6。经IR、^13CNMR和甲基化分析，推测该多糖可能以1,3-连接的鼠李糖为主链。其中木糖为β构型，鼠李糖、葡萄糖和甘露糖醛酸均为α构型，所有糖基均呈吡哺型。

英文摘要：

The acidic polysaccharide was isolated and purified from Spirulina Platensis. The pure acidic polysaccharide of Spirulina Platensis （APSP） was obtained after chromatography on DEAE-cellulose and Sephadex-200 columns. Its purity was 96.7% determined by HPLC, and the molecular weight was homogeneous. The mean MW was about 1.62×10^5. The components of APSP were identified by GC and TLC as： D-rhamnose, D-xylose, D-glucose and D-mannuronic acid in a molar ratio of about 65.5 ： 19.5 ： 9 ： 6. The results of IR, ^13C NMR and methylation analysis showed that APSP probably had a main chain of 1,3-1inked rhamnose residues, and the xylose had β-configuration while the rhamnose, glucose, and mannuronic acid had α-configuration. The configuration of all residues was pyranose form.