The water soluble tri-methy quternary ammonium salt of chitosan is synthesized by exhaustive methylation of amino in the chitosan with excess methyl iodide, its structure is characterized after purification.

• 利用壳聚糖分子中氨基的特性，与过量碘甲烷进行彻底甲基化反应合成水溶性的壳聚糖三甲基季铵盐，纯化后进行了结构表征。