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KMID : 1160619970020010001
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Preventive Nutrition and Food Science
1997 Volume.2 No. 1 p.1 ~ p.5
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Effect of Molecular Weight and NaCI Concentration on Dilute Solution Properties of Chitosan
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Hwang Jae-Kwan
Hong Sang-Pil
Kim Chong-Tai
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Abstract
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Solution properties of polyelectrolytic biopolymers such as chitosan, pectin, alginate and etc. are significantly influenced by molecular weight and salt concentrations. The effect of NaGl concentration on the hydrodynamic properties of chitosan in dilute region was investigated for chitosans of varying molecular weights. Intrinsic viscosity([η]) of chitosans with 5 different molecular weight was determined by glass capillary viscometer, and the viscosity average molecular weight was calculated using Mark-Houwink equation. Intrinsic viscosity decreased with increasing NaGl concentration for all chitosan samples, and it was proportional to the logarithmic NaGl concentration. i.e., [η]∝log (C_(NaCl))^α . Decreasing trend of [η] with NaGl concentration became more pronounced with increasing molecular weight. It was also found that the a values, indicating GNaCl dependence of [η], were linearly correlated with the logarithmic molecular weight(R²=0.980). The chain stiffness parameters (B) were calculated by B=S/([η]_(0.1))^(1.32), in which S was obtained from slope of [η] vs I^(-1/2) The B values of chitosan samples were determined to be 0.113~0.071 with a average of 0.09.
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KEYWORD
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chitosan, intrinsic viscosity, rheology, chain stiffness
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