Simultaneous analysis of anionic, amphoteric, nonionic and cationic surfactant mixtures in shampoo and hair conditioner by RP-HPLC/ELSD and LC/MS |
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Authors: | Im Sung Hyun Jeong Young Han Ryoo Jae Jeong |
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Institution: | a Analytical Laboratory, R&D Institute, LG Household and Health Care, Taejeon 305-343, South Korea b Analysis & Evaluation Research Institute, KOLON Central Research Park, Yongin 446-797, South Korea c Department of Chemistry Education, Kyungpook National University, Taegu 702-701, South Korea |
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Abstract: | 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 μg mL−1 except for SLES (150 μg mL−1), and the calibration curves, i.e. the log-log plots, were linear in the working range of 2.5-5250 μg mL−1 with R2 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. |
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Keywords: | Reversed-phase liquid chromatography-evaporative light scattering detection Liquid chromatograph-mass spectrometer Anionic surfactant Amphoteric surfactant Nonionic surfactant Cationic surfactant |
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