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OALib Journal期刊
ISSN: 2333-9721
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生物合成聚γ-谷氨酸的相对分子质量表征
DOI: 10.3969/j.issn.1671-7627.2003.06.002, PP. 6-10
Keywords: 聚γ-谷氨酸,凝胶渗透色谱,激光光散射,特性粘数,mark-houwink方程
Abstract:
为了确定特定条件下聚γ-谷氨酸(γ-pga)水溶液的mark-houwink方程参数,在参数适用范围内通过特性粘度测量,对γ-pga的相对分子质量进行快捷、可靠的估计,在对钠盐型γ-pga稀溶液的粘度特性和流变性质进行了系统考察的基础上,采用凝胶渗透色谱-激光光散射联机试验(gpc-lls)和粘度方法,研究了钠盐型γ-pga的特性粘数、分子尺寸对重均相对分子质量的依赖性;建立了γ-pga在1.20mol/lnacl水溶液中的mark-houwink方程.提出了相对分子质量的测定方法,并对均方末端距进行了估算.较大的α值表明:γ-pga大分子即使在1.20mol/l的离子强度下由于聚离子的静电相斥作用仍然在溶剂中呈现出较伸展的构象,即呈棒状结构.
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