慈姑直链淀粉的分离与分子结构

Separation and Molecular Structure of Arrowhead Amylose

利用正丁醇法分离慈姑直链淀粉与支链淀粉,并对慈姑直链淀粉进行了深入研究。试验结果表明:慈姑直链淀粉与碘的络合物最大吸收波长为620.5nm,其蓝值为0.844,特性黏度[η]为127mL/g。测得慈姑直链淀粉的分子结构参数为:聚合度DP=640,黏均分子质量η=3.11×105。

Purified amylose and amylopectin of arrowhead starch were successively separated by n-butanol recrystallization method. The study on arrowhead amylose shows that the maximum absorption wavelength of iodine-amylose complexes（λmax） was 620.5nm, the blue value was 0. 844 and limiting viscosity number [η] was 127mL/g. The molecular structure parameters of the amylose were also determined, the average degree of polymerization（DP） was 640 and the viscosity -average molecular weight Mη was 3.11 × 10^5 u.