渗透压计
壳聚糖
化学
特性粘度
分散性
高分子化学
溶剂
离子强度
分子质量
摩尔质量分布
分析化学(期刊)
色谱法
物理化学
有机化学
聚合物
水溶液
酶
作者
Mohammad Reza Kasaai,Joseph Arul,G�rard Charlet
标识
DOI:10.1002/1099-0488(20001001)38:19<2591::aid-polb110>3.0.co;2-6
摘要
The intrinsic viscosity–molecular weight relationship for chitosan was determined in 0.25 M acetic acid/0.25M sodium acetate. Chitosan samples with a degree of acetylation (DA) between 20 and 26% were prepared from shrimp-shell chitosan by acid hydrolysis (HCl) and oxidative fragmentation (NaNO2). Absolute molecular weights were measured by light scattering and membrane osmometry. Size exclusion chromatography (SEC) was used to determine average molecular weights (Mn, Mv, and Mw) and polydispersity. The following Mark–Houwink–Sakurada equation (MHS) is proposed for chitosan of Mw in the range of 35–2220 kDa: The value of the MHS exponent a suggests that chitosan behaves as a flexible chain in this solvent. Examination of MHS constants obtained in this work and those available in the literature with other solvents indicates that a and K are inversely related and that they are influenced by DA, and pH and ionic strength of the solvent. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 38: 2591–2598, 2000
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