Preparation of Chitosan Powder and Investigation of Its Properties

Kitosaanpulbri saamine ja selle omaduste uurimine

Marianna Laka ； Svetlana Chernyavskaya

《Proceedings of the Estonian Academy of Sciences.Chemistry》 55卷2期 (2006/06) Pp. 78-84

並列摘要

For the preparation of chitosan powder, the thermocatalytic destruction method developed in our earlier works was applied. Chitosan samples obtained from exoskeletons of crustaceans with a molecular weight of 500 kDalton, deacetylation degree 80% and with a molecular weight of 900 kDalton, deacetylation degree 70% were investigated. For these samples, optimal thermocatalytic treatment conditions for partial destruction of chitosan, which was controlled from the change in intrinsic viscosity, to the levelling-off degree of polymerization (LODP) were developed. In our case, LODP was ~140 units. The destructed chitosan was dissolved in water and precipitated with adding a definite amount of NaOH. The precipitated chitosan was washed off, dried at 60℃, and ground in a ball mill. As a result, a cream-like powder was obtained, whose major part of particles had sizes of 1-15 μm. The properties of the obtained powder were investigated by the microscopic, X-ray diffraction, IR spectroscopic, and physicochemical methods.

並列關鍵字

chitosan ； deacetylation degree ； intrinsic viscosity ； levelling-off degree of polymerization ； thermocatalytic destruction