Chinese Journal of Applied Chemistry ›› 2017, Vol. 34 ›› Issue (11): 1307-1313.DOI: 10.11944/j.issn.1000-0518.2017.11.170251

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Electrochemical Detection of Antioxidants in Cosmetic Samples Using Mesoporous Silica Film and Confined Micelles

DING Hao,YAN Fei,ZHENG Wenjing,GUO Weiliang,SU Bin()   

  1. Institute of Analytical Chemistry,Department of Chemistry,Zhejiang University,Hangzhou 310058,China
  • Received:2017-07-18 Accepted:2017-08-30 Published:2017-11-08 Online:2017-11-08
  • Contact: SU Bin
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21335001, No.21575126), the Natural Science Foundation of Zhejiang Province(No.LR14B050001)

Abstract:

This work presents a novel approach for the electrochemical determination of butylated hydroxyanisole(BHA) and tert-butylhydroquinone(TBHQ) in real cosmetic samples using the indium tin oxide(ITO) electrodes modified with vertically aligned mesoporous silica channels retaining micelles of cetyltrimethylammonium bromide(CTAB). The ultra-small pore size of the channels, namely 2.3 nm in diameter, rendered the size screening capability of the electrode. Meanwhile, the hydrocarbon tails of CTAB provided a hydrophobic microenvironment, which enabled the rapid extraction and preconcentration of lipophilic organic analytes from sample solutions. An excellent analytical sensitivity, a wide dynamic range and a low limit of detection were obtained for both antioxidants under optimized conditions. Recovery values between 96.4% and 104% indicate the practical usefulness of the proposed sensor.

Key words: electrochemical sensor, mesoporous silica film, antioxidants, micelles, cosmetic