Fluorescence-detecting cationic surfactants using luminescent CdTe quantum dots as probes

作者：Diao Xue Lian; Xia Yun Sheng; Zhang Tian Long; Li Yan; Zhu Chang Qing^*

来源：Analytical and Bioanalytical Chemistry, 2007, 388(5-6): 1191-1197.

DOI：10.1007/s00216-007-1319-7

• cationic surfactants
• CdTe quantum dots
• fluorescence quenching
• mercapto cotton

A novel fluorescence quenching method for the determination of cationic surfactants (CS), specifically cetyltrimethylammonium bromide (CTAB), dodecyltrimethylammonium bromide (DTAB), and cetylpyridinium chloride (CPC), has been developed using water-soluble luminescent CdTe quantum dots (QDs) modified with thioglycolic acid (TGA). The possible interference from heavy and transition metals (HTM) has been efficiently eliminated through simple sample treatment with mercapto cotton made in-house. Under optimum conditions, the extent of fluorescence quenching of CdTe QDs is linearly proportional to the concentration of CS from 2.0x10(-7) to 7.0x10(-6) mol L-1 with a detection limit of 5.0x10(-8) mol L-1. The relative standard deviation for 1.0x10(-6) mol L-1 CTAB is 2.5% (n=6). The proposed method exhibits high sensitivity and selectivity and furthermore avoided the use of toxic organic solvents and tedious solvent extraction procedures. It has been applied to the determination of trace CS in natural river water and commodity samples with satisfactory results.

• 出版日期2007-7
• 单位安徽师范大学