Analytical and Bioanalytical Chemistry

, Volume 388, Issue 5, pp 1191–1197

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

  • Xue-Lian Diao
  • Yun-Sheng Xia
  • Tian-Long Zhang
  • Yan Li
  • Chang-Qing Zhu
Original Paper

DOI: 10.1007/s00216-007-1319-7

Cite this article as:
Diao, XL., Xia, YS., Zhang, TL. et al. Anal Bioanal Chem (2007) 388: 1191. doi:10.1007/s00216-007-1319-7

Abstract

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 2.0 × 10−7 to 7.0 × 10−6 mol L−1 with a detection limit of 5.0 × 10−8 mol L−1. The relative standard deviation for 1.0 × 10−6 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.

Potential interference from heavy and transition metals is eliminated during photoluminescence detection of CS through simple sample pre-treatment with mercapto cotton

Keywords

Cationic surfactants CdTe Quantum dots Fluorescence quenching Mercapto cotton 

Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Xue-Lian Diao
    • 1
  • Yun-Sheng Xia
    • 1
  • Tian-Long Zhang
    • 1
  • Yan Li
    • 1
  • Chang-Qing Zhu
    • 1
  1. 1.Anhui Key Laboratory of Functional Molecular Solids, College of Chemistry and Materials ScienceAnhui Normal UniversityWuhuChina