不同脱乙酰度壳聚糖的Mark-Houwink方程的测定。
Determination of the Mark-Houwink equation for chitosans with different degrees of deacetylation.
作者信息
Wang W, Bo S Q, Li S Q, Qin W
机构信息
Polymer Physics Laboratory, Changchun Institute of Applied Chemistry, Academia Sinica, People's Republic of China.
出版信息
Int J Biol Macromol. 1991 Oct;13(5):281-5. doi: 10.1016/0141-8130(91)90027-r.
The values of k and alpha in the Mark-Houwink equation have been determined for chitosans with different degrees of deacetylation (DD) (69, 84, 91 and 100% respectively), in 0.2 M CH3COOH/0.1 M CH3COONa aqueous solution at 30 degrees C by the light scattering method. It was shown that the values of alpha decreased from 1.12 to 0.81 and the values of k increased from 0.104 x 10(-3) to 16.80 x 10(-3) ml/g, when the DD varied from 69 to 100%. This is due to a reduction of rigidity of the molecular chain and an increase of the electrostatic repulsion force of the ionic groups along the polyelectrolyte chain in chitosan solution, when the DD of chitosan increases gradually.
通过光散射法，在30℃下于0.2M CH3COOH/0.1M CH3COONa水溶液中测定了不同脱乙酰度（DD）（分别为69%、84%、91%和100%）的壳聚糖在Mark-Houwink方程中的k值和α值。结果表明，当DD从69%变化到100%时，α值从1.12降至0.81，k值从0.104×10⁻³增加到16.80×10⁻³ml/g。这是由于随着壳聚糖脱乙酰度逐渐增加，壳聚糖溶液中分子链的刚性降低，且聚电解质链上离子基团的静电斥力增加。
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