低窄壳糖两亲分子的合成及表面活性

Synthesis and Surfactivity of Low DP Narrow Relative Molecular Weight Distribution Chitosan Amphiphilic Molecule

以窄的相对分子质量(简称分子量,下同)分布的低聚壳聚糖(简称为低窄壳糖;LNCS20,聚合度DP=20;分子量分布指数M w/M n=1.20)为原料,制备了两亲性衍生物N-琥珀酰化-N'-癸烷基低窄壳糖(SDLNCS20)。通过FTIR和1HNMR对SDLNCS20结构进行了表征,并对其溶解性、乳化性和润湿性能进行了测试,通过表面张力和荧光光谱法对其表面活性和临界胶束浓度(CMC)进行了研究。结果表明,LNCS20氨基位上成功引入了亲水性琥珀酸酐残基和亲油性长链烷基,SDLNCS20的CMC值为0.355 g/L,对应的表面张力为30.01 mN/m,具有良好的水溶性和乳化性能。

The amphiphilic chitosan derivative N-succinyl-N＇-decyl low degree of polymerization （DP） and narrow relative molecular weight distribution chitosan （ SDLNCS20 ） was prepared from low DP and narrow molecular weight distribution chitosan （ LNCS20, DP = 20 ; Mw/Mn = 1.20 ）. Its structure was characterized by FFIR and 1HNMR. The solubility, emulsifying and wetting properties were also studied. Surface activity and critical mieelle concentration （CMC） of SDLNCS20 were studied with the method of surface tension and fluorescence spectrum. The results showed the hydrophilie succinyl group and hydrophobic long alkyl chains were successfully introduced to the amine group of LNCS2o. The CMC value of SDLNCS20 is 0. 355 g/L, and corresponding surface tension is 30. 01 mN/m. Besides, SDLNCS2o was showed excellent water solubility and emulsifying property.