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Ultrasonic Extraction Coupled with Capillary Electrophoresis for the Determination of Azo Dyes in Lipsticks Using Ionic Liquid as Dynamic Coating and Background Electrolyte
Author(s) -
Li Dan,
Wang Ziming,
Wang Lu,
Xu Xu,
Zhang Hanqi
Publication year - 2011
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201190043
Subject(s) - chemistry , ionic liquid , capillary electrophoresis , extraction (chemistry) , electrolyte , chromatography , tetrafluoroborate , ultrasonic sensor , capillary action , electrophoresis , coating , analytical chemistry (journal) , yield (engineering) , electrode , materials science , organic chemistry , composite material , physics , acoustics , catalysis
A simple and rapid method based on ultrasonic extraction and capillary electrophoresis using 1‐butyl‐3‐methylimidazolium tetrafluoroborate as dynamic coating and background electrolyte was developed. The method was applied to the separation and determination of three azo dyes in two lipsticks. To increase extraction rate and yield, lipstick samples were coated on a glass slide before ultrasonic extraction. The dyes were extracted by ultrasonic extraction for 30 min, and then determined by capillary electrophoresis. Several experimental factors, such as ionic liquid concentration, pH value of background electrolyte and applied voltage, were examined and optimized. Under the optimal conditions, three azo dyes were completely separated within 12 min, and the detection limits for the three azo dyes ranged from 0.33 to 0.88 μg/mL. The recoveries were in the range of 96.8% to 108.8%.