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Anal Chim Acta. 2013 Feb 26;765:54-62. doi: 10.1016/j.aca.2012.12.036. Epub 2013 Jan 2.

Glassy carbon electrodes modified with gold nanoparticles for the simultaneous determination of three food antioxidants.

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State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, PR China.


Electrochemical behavior of three antioxidants: butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT) and butylated hydroquinone (TBHQ), was investigated at a glassy carbon electrode modified with gold nanoparticles (AuNPs/GCE). This electrode was characterized by scanning electron microscopy (SEM). The experimental results indicated that the modified electrode was strongly electroactive during the redox reactions of BHA, BHT and TBHQ, and this was confirmed by the observed increased redox peak currents and shifted potentials; in addition, the oxidation products of BHA and TBHQ were found to be the same. The experimental conditions were optimized and the oxidation peaks of BHA and BHT were clearly separated. Based on this, an electrochemical method was researched and developed for the simultaneous determination of BHA, BHT and TBHQ in mixtures with the use of first derivative voltammetry; the linear concentration ranges were 0.10-1.50 μg mL(-1), 0.20-2.20 μg mL(-1) and 0.20-2.80 μg mL(-1), and detection limits were 0.039, 0.080 and 0.079μgmL(-1), for BHA, BHT and TBHQ, respectively. The proposed method was successfully applied for the analysis of the three analytes in edible oil samples.

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