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中文摘要：
褐藻胶主要来源于褐藻细胞壁，由L-古罗糖醛酸和D-甘露糖醛酸通过1→4糖苷键连接形成直链大分子，含有聚甘露糖醛酸片段、聚古罗糖醛酸片段和聚甘露糖醛酸-古罗糖醛酸杂合段．大分子褐藻胶具有抗肿瘤、增强免疫等活性，分子中的甘露糖醛酸是主要酌激发因子．褐藻胶经降解获得的寡糖能显著提高生物活性并赋予新的生物活性．褐藻胶用酶法降解在寡糖非还原端形成不饱和双键。
英文摘要：
A series of oligomannuronates with series degree of polymerization （ DP = 2--8） were prepared by acid hydrolysis from alginate-derived homopolymannuronate blocks, and the structures of the oligosaccharides were analyzed. The macromolecule of alginate was treated by partial acid hydrolysis and fractionated at pH = 2.85 resulting in homopolymannuronate blocks. The homopolymer was degraded by acid hydrolysis, and the oligosaccharides were separated and purified by gel chromatography. The oligosaccharides were characterized by fluorophore-assisted carbohydrate electrophoresis（FACE） , and the structures of derived oligomannuronates were determined by ESI-MS, NMR as well as FTIR analysis.
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