초록

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Abstract ▼ AI-Helper

In order to study the effects of reaction temperature, time and particle size on the physicochemical properties of chitosan, commercially available chitin was treated with 50%(w/w) NaOH. To obtain 78% of deacetylation, a treatment of 6 hours at $100^{\circ}C$(Ch-100), 20 minutes at $...

In order to study the effects of reaction temperature, time and particle size on the physicochemical properties of chitosan, commercially available chitin was treated with 50%(w/w) NaOH. To obtain 78% of deacetylation, a treatment of 6 hours at $100^{\circ}C$(Ch-100), 20 minutes at $120^{\circ}C$(Ch-120) or 10 minutes at $140^{\circ}C$(Ch-140) was necessary. The resulting chitosans showed a different viscosity; 180cps for Ch-100, 130cps for Ch-120, 30cps for Ch-140. The residence time at $80^{\circ}C$ also decreased the viscosity of the chitosan but the reduction in the particle size of chitin largely favored deacetylation and resulted in a higher viscosity of the chitosan. Compared with chitin, the capacity of water and oil absorption of chitosan was not significantly improved. However, the capacity of dye absorption was increased by 4 times by the deacetylation. In addition the IR spectra of chitosans showed less sharp absorption bands than that of chitin.

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