十一种壳聚糖衍生物的紫外吸收特性  

UV-Absorption Characteristics of Eleven Chitosan Derivatives

作　　者：董炎明[1] 毕丹霞[1] 赵雅青[1] 毛微[1] 杨柳林[1] 王惠武[1] 

机构地区：[1]厦门大学材料科学与工程系,厦门361005

出　　处：《应用化学》2005年第10期1050-1054,共5页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(20374041);福建省自然科学基金(E0310002;E0510003);福建省重点科技(2004I006)资助项目

摘　　要：通过对O-氰乙基壳聚糖、N-苄基壳聚糖等11种壳聚糖衍生物的紫外吸收特性的研究发现,在稀溶液体系中,这些衍生物的紫外吸收光谱都可以覆盖整个UV-B区(280～320 nm),其中N-羟基苄基壳聚糖、N-苯基乙烯基甲基壳聚糖甚至可以覆盖至UV-A区(＞320 nm);大部分衍生物吸收强度可达中等以上,N-苯甲醛西佛碱壳聚糖、N-羟基苄基壳聚糖、N-苯基乙烯基甲基壳聚糖、辛基氨基甲酸酯基壳聚糖、萘基氨基甲酸酯基壳聚糖达到强吸收. 而在浓溶液体系中,虽然由于浓度过高不能得到完整的谱图,但是可以通过其出峰位置的移动来说明其聚集态的变化. 液晶临界浓度附近,峰的位置移动较大,而将液晶态冻结下来的N-苄基壳聚糖薄膜的紫外光谱已经可以覆盖大部分的UV-A区.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.

关 键 词：壳聚糖 胆甾液晶 紫外光吸收剂 化妆品 

分 类 号：O636.1[理学—高分子化学]