Journal of the Korean Industrial and Engineering Chemistry, Vol.9, No.3, 399-403, June, 1998
졸-겔법에 의한 키토산의 겔화
Gelation of Chitosan by Sol-Gel Method
초록
분자량이 서로 다른 키토산을 제조하여 분자량의 변화에 따른 키토산 졸의 겔화 특성을 겔화제의 농도와 온도에 대해 조사하였다. 본 연구에 사용한 키토산의 평균 분자량은 각각 2.0×105, 5.2×105, 8.2×105이며 탈아세틸화도는 약 85%이었다. 겔화제로 NaOH를 사용하였으며 겔화현상을 설명하기 위하여 간단한 확산모델을 이용하였다. 겔화제의 농도와 온도 그리고 키토산 분자량이 증가할수록 키토산 겔 내부에서 겔화제의 확산계수는 증가했다.
The gelation characteristics of chitosan of different molecular weight were investigated in terms of concentration and temperature of alkari aqueous solution. The average molecular weights and the degrees of deacetylation of the chitosan used were 2.0×105, 5.2×105, 8.2×105 and 85%, respectively. Sodium hydroxide solution was used as a gelation agent. A simple diffusion model was applied to study the gelation rate. The diffusion coefficients of the gelation agent in the chitosan gel increased with increasing its concentration, temperature of the casting solution, and molecular weight of the chitosan.
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