Efficient Determination of Butylated Hydroxyanisole Using an Electrochemical Sensor Based on Cobalt Oxide Nanoparticles Modified Electrode

Abstract

A simple and reliable electrochemical sensor based on cobalt oxide nanoparticles modified glassy carbon electrode (GCE/CoOxNPs) for determination of butylated hydroxyanisole is presented here. The nanoparticles were fabricated by electrodepositing method. The modified electrode shows excellent catalytic activity toward butylated hydroxyanisole oxidation in pH 12.0 phosphate buffer solution (PBS). The detection limit (S/N = 3), sensitivity and catalytic rate constant (k_cat) of the modified electrode toward butylated hydroxyanisole were 2.9 µM, 5.1 nA μM^-1 and 1.1 × 10⁴ M^-1 s^-1, respectively, at linear concentration rang up to 1350 μM. The capability of the modified electrode for direct butylated hydroxyanisole quantification in real samples is also discussed. This modified electrode shows many advantages such as good catalytic activity, good reproducibility, simple preparation procedure and long-term stability of signal response during butylated hydroxyanisole oxidation. In this report, compared with most cases previously reported, the detection potential of the BHA occurs at a lower potential.