用一种新的疏水共轭聚合物荧光测定曲通X-100及其临界胶束浓度  

Determination of Triton X-100 and Its Critical Micelle Concentration by Using a New Hydrophobic Fluorescent Conjugated Polymer

作　　者：李鸣凤[1] 孙礼林[1] 郝丹[1] 朱昌青[1] 

机构地区：[1]安徽师范大学化学与材料科学学院安徽省化学与生物传感重点实验室,安徽芜湖241000

出　　处：《安徽师范大学学报（自然科学版）》2011年第5期455-460,共6页Journal of Anhui Normal University(Natural Science)

基　　金：国家自然科学基金(20875003)

摘　　要：通过Sonogashira钯催化偶联反应,合成了一种新的疏水性荧光共轭聚合物,聚[2,5-二壬氧基-1,4-苯撑-乙炔撑-2-甲酰-基1,4-苯撑](poly[2,5-bisnonyloxy-1,4-phenylene-ethynylene-2-formyl-1,4-phenylene],PPECHO),并研究了此聚合物与表面活性剂的相互作用.PPECHO在水溶液中荧光发生明显猝灭.加入非离子表面活性剂曲通X-100(TX-100)后,聚合物的荧光显著增强,而其它表面活性剂(Tween、Brij-35、CTAB、SDS)对PPECHO的荧光强度没有明显影响.据此,我们建立了一种简单的选择性检测TX-100的荧光方法.最佳条件下,体系的荧光强度与TX-100的浓度分别在0-0.2×10-3和0.2×10-3-0.8×10-3mol/L的范围内分段成线性关系,检测限为6.5×10-7mol/L.同时,两条工作曲线的交点所对应的TX-100的浓度与其临界胶束浓度(CMC)值一致,这为胶束的形成提供了一种直接的指示.该法用于实际样品中TX-100的测定,结果令人满意.A novel hydrophobic fluorescent conjugated polymer,poly [2,5-bisnonyloxy-1,4-phenylene-ethynylene-2-formyl-1,4-phenylene]（PPECHO） was synthesized,and its interaction with some surfactants was investigated.The fluorescence of the polymer was obviously quenched in aqueous solution.But the fluorescence was enhanced with the increase of the concentration of Triton X-100（TX-100）,while other surfactants,such as Tween,Brij-35,CTAB and SDS had little effect on the fluorescence intensity.Thus,a simple and selective method for the determination of TX-100 has been developed.Under the optimum conditions,the fluorescence intensity was proportional to the concentration of TX-100 in the range of 0-0.2×10-3 and 0.2×10-3-0.8×10-3mol/L,respectively.The detection limit was 6.5×10-7mol/L.Meanwhile,the concentration corresponding to the point of intersection of the two calibration graphs was found to be in good agreement with the critical micelle concentration of TX-100,which provided a direct indication for the formation of TX-100 micelle.The method was applied to the determination of TX-100 in real samples,and satisfied results were obtained.

关 键 词：荧光共轭聚合物 曲通X-100 临界胶束浓度(CMC) 

分 类 号：O665[理学—分析化学]