用户论文(2003)：魔芋葡甘聚糖分子链形态及链参数研究

【中文摘要】 目的　研究魔芋葡甘聚糖分子链形态 ,测定分子链参数。方法　采用光散射、凝胶渗透色谱及粘度法测定溶液行为 ;采用原子力显微镜及透射电镜直接观测分子形貌。结果　魔芋葡甘聚糖重均分子量Mw 、均方根旋转半径〈S2 〉1 2 以及第二维利系数A2 分别为 1 0 4× 10 6 ,(10 5 0± 0 9)nm ,和 (- 1 5 9± 0 2 8)× 10 - 3mol·mL·g- 2 ,多分散系数Mw Mn 为 1 0 2 ,Mark Houwink方程为 [η]=5 96× 10 - 2 M0 73w ;分子链参数ML =982 82nm- 1 ,q =2 7 93nm ,d =0 74nm ,h =0 2 6nm ,L =10 5 4 11nm。结论　直接观察到的分子形貌和根据溶液行为的推测均说明 ,魔芋葡甘聚糖为伸展的有一定刚性的半屈曲性直链分子 ,不存在支链 【英文摘要】 Aim To study the molecular chain morphology and chain parameters of konjac glucomannan(KGM). Methods Solution behavior was studied by using light scattering(LS), gel permeation chromatograph (GPC) and method of viscosity. The molecular morphology was observed directly by atom force microscope (AFM) and transmission electron microscope (TEM). Results The average molecular weight (M w ), root-mean-square ratio of gyration(〈S 2〉 1/2), second Viral coefficients (A 2 ) and multi-disperse coefficients (M...