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Citation: DONG Yan-Ming, BI Dan-Xia, ZHAO Ya-Qing, MAO Wei, YANG Liu-Lin, WANG Hui-Wu. UV-Absorption Characteristics of Eleven Chitosan Derivatives[J]. Chinese Journal of Applied Chemistry, ;2005, 22(10): 1050-1054. shu

UV-Absorption Characteristics of Eleven Chitosan Derivatives

1.
Department of Materials Science & Engineering, Xiamen University, Xiamen 361005

Corresponding author: DONG Yan-Ming,
Received Date: 19 December 2004
Available Online: 10 April 2005
Fund Project: 国家自然科学基金(20374041) (20374041)福建省自然科学基金(E0310002,E0510003) (E0310002,E0510003)福建省重点科技(2004I006)资助项目 (2004I006)

The UV absorption spectra of eleven chitosan derivatives,for example O-cyanoethyl chitosan and N-benzyl chitosan,were obtained.In dilute solution,the UV-Vis absorption spectra of all these derivatives cover the ultraviolet B region(280~320 nm).The UV-Vis spectra of N-salicylaldehyde modified chitosan and N-cinnamaldehyde modified chitosan cover part of the ultraviolet A region(>320 nm).In concentrated solution,complete spectra cannot be achieved due to the limit of the instrument.With the increase of the concentration,red shift appears in the UV-Vis spectra,which indicates that the state of aggregation has changed.At the critical concentration for the cholesteric liquid crystalline phase,the position of the peak shifts obviously.This phenomenon can be explained by the increase of the interaction of the chromophore induced by the ordered arrangement of the mesophase.Moreover the UV-Vis spectrum of the film of N-benzyl chitosan in liquid crystalline state covers the whole ultraviolet region.The UV-absorption characteristics of these chitosan derivatives show that they may be used as photoprotectants employed in cosmetic and pharmaceutical preparations.
- chitin,
- cholesteric liquid crystal,
- UV absorber,
- cosmetic
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