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《Journal of Instrumental Analysis》 2015-06
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Determination of Five Preservatives in Cosmetics by Fully Automated Quantitative Micellar Electrokinetic Capillary Chromatography

XU Yuan;LING Bang-zan;YAO Dong;ZHANG Lin;WANG Yan;YAN Chao;Pharmacy School,Shanghai Jiaotong University;Unimicro Technologies,Inc.;  
A fully automatic quantitative capillary electrophoresis system,which consists of a labmade auto-sampler equipped with a 10 n L rotary type injector and a lab-made thermostat with cooling capacity,was developed. The accuracy and precision of the method were greatly improved compared with that of the conventional capillary electrophoresis( CE). This article explored the feasibility of determination of benzoic acid,methyl p-hydroxybenzoate( MP),ethyl p-hydroxybenzoate( EP),propyl p-hydroxybenzoate( PP) and butyl p-hydroxybenzoate( BP) in cosmetics by fully automated quantitative micellar electrokinetic capillary chromatography( q MEKC). The contents of MP,benzoic acid,EP,PP and BP in body cream and exfoliating gel were determined with a mobile phase of 15 mmol /L borax buffer and 100 mmol / L SDS( p H 9. 3) mixture and a separation voltage of 20 k V. Good separation for the five preservatives was achieved under the optimal conditions,with RSDs of peak area lower than 2%. This method is rapid and accurate,and may be employed in the quality control of preservatives in cosmetics.
【Fund】: 国家重大科学仪器设备开发专项项目(2011YQ150072 2011YQ15007201);; 国家自然科学基金项目(21175092 21105064);; 上海市自然科学基金项目(12ZR1413600);; 上海市科委“科技创新行动计划”科学仪器研制(14142200200 13142200100)
【CateGory Index】: O657.7;TQ658
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