摘要
为了确定特定条件下生物合成聚γ 谷氨酸(γ PGA)稀溶液的Mark Houwink方程参数,从而在关系适用范围内能够通过比较简单的特征粘数测量对γ PGA的相对分子质量进行快捷而可靠的估算,用毛细管粘度计法对钠盐型γ PGA稀溶液的粘度特性进行了系统考察。结果发现钠盐型γ PGA是一种典型的聚电解质,在一定浓度范围内显示了比浓粘度独特的浓度依赖性:不服从Huggins方程。中等离子强度的外加小分子强电解质会减小γ PGA稀溶液的特性粘数[η],并使之呈现出正常的粘度行为,且[η]与溶液中离子强度的-1/2次幂成较好的线性关系。[η]具有一定的时间依赖性。
The viscometric properties of bioorigin poly(γglutamic acid) (γPGA)dilute aqueous solutions were investigated systematically. Experiments showed that γPGA belongs to polyelectrolyte. The relationship between its reduced viscosity and polymer concentration doesn't coincide with Huggins equation, which can be changed by adding lowmolecularweight strong electrolyte such as NaCl with moderate ionic strength I, and herein the intrinsic viscosity is directly proportional to -1/2 exponential of I. Furthermore, value depends on time obviously, which may be caused by the biopolymer chain transition between spiral conformation and random coil arising from the reconstruction of intramolecular synergic hydrogen bond.
出处
《南京工业大学学报（自然科学版）》
CAS
2003年第5期64-67,共4页
Journal of Nanjing Tech University(Natural Science Edition)
基金
江苏省教育厅基金项目(02KJB430005)
