期刊
ANALYTICA CHIMICA ACTA
卷 619, 期 1, 页码 129-136出版社
ELSEVIER
DOI: 10.1016/j.aca.2008.03.058
关键词
reversed-phase liquid chromatography-evaporative light scattering detection; liquid chromatograph-mass spectrometer; anionic surfactant; amphoteric surfactant; nonionic surfactant; cationic surfactant
A simple and simultaneous analysis method for four (anionic, amphoteric, nonionic, and cationic) classes of surfactants in shampoo and hair conditioner was newly developed. Analysis of the surfactants was performed using a reversed-phase HPLC (RPLC) combined with evaporative light scattering detection (ELSD) without any pre-treatment. An optimum analysis condition for the resolution of both four main surfactant mixtures used in shampoo and five main surfactants used in hair conditioner could be established under a gradient mobile phase condition with acetonitrile, tetrahydrofuran and water. The detection limits were 2.5-30 mu g mL(-1) except for SLES (150 mu g mL(-1)), and the calibration curves, i.e. the log-log plots, were linear in the working range of 2.5-5250 mu g mL(-1) with R-2 values of above 0.998. The observed precision was less than 5% R.S.D. The elution peaks were identified by a liquid chromatography-mass spectrometer (LC-MS) equipped with an electrospray interface operating in mixed-mode. (C) 2008 Elsevier B.V. All rights reserved.
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