Syntheses of the derivatives of chitin and chitosan, and their physicochemical properties

키틴 및 키토산 유도체의 합성과 그 물리화학적 특성

Derivatives (microcrystalline chitin, carboxymethylchitin, acetylchitin, N-acetylchitosan, ethylchitosan and chitosansulfate) of chitin and chitosan were synthesized, and the physicochemical properties of the derivatives were compared with those of chitin and chitosan. Carboxymethylchitin was soluble in water or acetic acid, whereas chitosan and ethylchitosan were soluble in acetic acid alone. The water binding capacity of N-acetylchitosan was two fold higher than that of chitin. Lipid binding capacity of carboxymethylchitin was the highest, holding 1800%, and that of chitin was the lowest, holding 511% among the derivatives. Carboxymethylchitin among the derivatives showed the highest emulsifying capacity, however chitin and chitosan didn't produce emulsions. Dye binding capacity of acetylchitin was the highest, holding 0.93 mg dye/g sample (Blue R-250) and 0.96 mg dye/g sample (Red No. 2). It was concluded that carboxymethylchitin is a good emulsifier and N-acetylchitosan, chitosansulfate and chitosan are suitable for use as dye absorbents.

키틴과 키토산으로부터 carboxymethylchitin, acetylchitin, ethylchitosan, N-acetylchitosan 및 chitosansulfate를 합성하여 그 물리화학적 기능특성을 키틴 및 키토산과 비교 검토 하였다. Carboxymethylchitin은 물과 아세트산에 용해되었지만 ethylchitin은 아세트산에만 용해되었다. 보수력은 N-acetylchitosan이 1194%로 키틴에 비해 약 2배 정도 높았으며, 지방흡수력은 carboxymethylchitin이 1800%로 키틴 511%에 비해 월등히 높았다. Carboxymethylchitin의 유화성이 75.91%로 가장 높았으며 그 다음이 미세결정형 키틴으로 57.02%였으나 키틴 및 키토산은 유화성이 나타나지 않았다. 색소흡착능은 acetylchitin이 0.93 mg dye/g sample(Blue R-250), 0.96 mg dye/g sample(Red-2)로 키틴 및 키토산 보다 높았다. 따라서 carboxymethylchitin은 유화제로서, acetylchitosan은 색소흡착제로서 이용이 가능할 것으로 판단된다.