title: Determination of seven preservatives in cosmetic products by micellar electrokinetic chromatography.
abstract: A micellar electrokinetic chromatography method using cetyltrimethylammonium bromide (CTAB) as a cationic surfactant, coupled with UV-Vis detection, was developed for the simultaneous determination of seven preservatives, including methyl-, ethyl-, propyl- and butyl-paraben and phenol, phenoxyethanol and resorcinol. The method involved optimizing the pH of the phosphate buffer and concentrations of CTAB, ethanol and 2-hydroxypropyl-β-cyclodextrin (HP-β-CD). The preservatives were well separated using optimum conditions and separated within 10 min at a separation voltage of -12.5 kV with the 1.0 mM phosphate buffer (pH 7.0) containing 90 mM CTAB, 25 mM HP-β-CD and 10% (v/v) ethanol. Satisfactory recoveries (84.1-103.0%), migration time (RSD < 3.1%) and peak area (RSD < 4.5%) repeatabilities were achieved. Detection limits of the preservatives were between 0.31 and 1.52 μg mL(-1) (S/N = 3, n = 5). The optimized method was successfully applied to the simultaneous determination of these preservatives in 10 commercial cosmetic products.
authors: Department of Applied Science, National Taitung University, Taitung, Taiwan.
authors: Jun-Qiang
authors: JQ
authors: Huang
authors: Cho-Chun
authors: CC
authors: Hu
authors: Tai-Chia
authors: TC
authors: Chiu
mesh_terms: D002851:Chromatography, High Pressure Liquid; D020374:Chromatography, Micellar Electrokinetic Capillary / Q000379:methods*; D003358:Cosmetics; D008401:Gas Chromatography-Mass Spectrometry; D057230:Limit of Detection; D011310:Preservatives, Pharmaceutical / Q000032:analysis*; D015203:Reproducibility of Results; D013056:Spectrophotometry, Ultraviolet
chemical_list: D003358:Cosmetics; D011310:Preservatives, Pharmaceutical
keywords: 2-hydroxylpropyl-β-cyclodextrin; cetyltrimethylammonium bromide; cosmetic products; micellar electrokinetic chromatography; preservatives