花粉蛋白和多糖的研究

从葡萄和罂粟花粉中分别纯化得RP3I和PSPP1-4肽, 测定了它们的生理活性,并合成了PSPP1以外的肽, 从Typha Angustifilia和codonopsis pilosula花粉获得了TA-C和CPA-E多糖, 并研究了它们的部份特征和结构。     

Hybrid organic–inorganic nanocomposites fabricated with a novel biocompatible precursor using sol-gel processing

The synthesis of hybrid organic–inorganic nanocomposite materials containing biopolymers by the sol-gel processing is often faced with severe difficulties owing to their poor compatibility with the common precursors. The problem was solved when tetrakis(2-hydroxyethyl) orthosilicate (THEOS) was recently suggested for the preparation of sol-gel derived nanocomposites. This article summarizes recent data on novel types of hybrid polysaccharide-silica nanocomposite materials fabricated with the help of THEOS. Their formation, properties and structure as well as features and possible mechanism for the sol-gel processes are considered. It is demonstrated that the novel approach is particularly suitable in situations where others are unsatisfactory. This includes systems of which supramolecular organization or phase state is sensitive to the pH of solutions, temperature and addition of organic solvents. One example of a successful application is the immobilization of labile enzymes. The biocompatibility of THEOS allows their activity to be retained, thereby enhancing long-term and thermal stabilities.     

Microcellobospotia grisea中具有强抗肿瘤活性多糖重复单元中心片断的合成

通过应用三氟乙酸酯法和Koenigs-Knorr方法，对Microcellobospotia grisea中具有强抗肿瘤活性多糖重复单元中心二糖片断进行了合成研究，并经元素分析，IR，^1H，^1^3C-NMR，^1H～^1H COSY及FAB-MS确证了合成得到的二糖片断10～13的结构。     

黄芪葡聚多糖的化学结构

从植物黄芪(Astragalus mongholicus Bunges)根的碱性水提取液中得到一水溶性多糖黄芪葡聚糖. 它由单一葡萄糖残基构成, 分子量为5x10^4. 甲基化、过碘酸盐氧化、Smith降解和部分水解后, 揭示了它是以1,4-葡萄糖残基为主链, 并在6-O有分枝、重复单元为10个葡萄糖残基的葡聚糖(结构如3所示).     

多糖与生物探针相互作用机理的研究: 透明质酸与天青A的反应

应用光谱法研究秀明质酸(HA)与天青A(AA)的相互作用机理,考察了反应体系中pH和AA/HA摩尔比对相互作用的影响,测得AA-HA复合物吸收光谱产生蓝移效应所需的临界AA/HA摩尔比1.28×10^3,HA对AA的最大结合数3.22×10^3,实验值与理论值完全一致,对多糖与生物探针的相互作用机理提出了合理的解释。