甲克素制备及结构表征.pdfVIP

8 卷 2 期 天 津 工 业 大 学 学 报 Vol.28 No.2 圆园园9 年4 月 韵哉砸晕粤蕴 韵云 栽陨粤晕 陨晕 孕韵蕴再栽耘悦匀晕陨悦 哉晕陨灾耘砸杂陨栽再 April 2009 壳聚糖制备条件的研究和结构表征 付宁 杨俊玲 倪 磊 渊天津工业大学 材料科学与化学工程学院袁天津 300 160冤 摘 要 虾壳为原料 采用正交实验法优化壳聚糖的化学制备工艺 进行壳聚糖的脱乙酰度测试 并采用红外光谱 渊IR冤尧热重法渊TG 冤和差示扫描量热法渊DSC冤进行壳聚糖和甲壳素结构表征. 结果表明院壳聚糖的最佳制备条 件为反应温度75 益 盐酸质量分数4% 脱蛋白碱质量分数8% 脱乙酰碱质量分数50% 曰在此条件下壳聚糖 的制备时间缩短为2 d 脱乙酰度达70% 以上曰壳聚糖粘度随制备温度的升高而降低曰 DSC 分析发现 放热 峰的峰顶对应温度与热失重所显示分解温度保持一致. 关键词院壳聚糖曰甲壳素曰制备曰结构表征 中图分类号 O636.1 文献标识码 A 文章编号 员远苑员原园圆源载渊 园园9冤园2原园园63原园4 Research of preparation conditions and structure characterization of chitosan FU Ning 袁 YANG Jun-ling 袁 NI Lei 渊School of Material Science and Chemical Engineering 袁 Tianjin Polytechnic University 袁Tianjin 300 160 袁 China 冤 Abstract 院 The chemical preparation process of chitosan is optimized by orthogonal method. The degree of deacetylation of chitosan is measured. The chitin and chitosan are analysed by infrared spectroscopy 渊IR冤袁 thermal proper鄄 ties 渊TG) and differential scanning calorimetry 渊DSC). As a result 袁the optimal preparation condition of chitosan is 75 益 reaction temperature 袁 4% hydrochloric acid 袁 50% sodium hydroxide. In this conditions the prepara鄄 tion time is shortened to 2 d and D.D. of chitosan exceeds 70%. The viscosity decreases with increasing tem鄄 perature. The DSC analysis founded that the peak corresponding exothermic peak temperature consistent with weight loss show decomposition temperature. Key