Au-Pt@Biomass porous carbon composite modified electrode for sensitive electrochemical detection of baicalein

Abstract

A gold and platinum bimetal decorated biomass porous carbon (Au-Pt@BPC) composite was synthesized by carbonization of oyster mushroom and solvothermal method, which was applied to the electrode modification and electrochemical detection of baicalein. The structural and elemental aspects of Au-Pt@BPC were analyzed by X-ray photoelectron spectroscopy, field emission scanning electron microscopy, transmission electron microscopy and Raman spectrum. The Au-Pt@BPC modified carbon ionic liquid electrode (CILE) was prepared as working electrode for the detection of baicalein. Baicalein exhibited a pair of redox peak on cyclic voltammograms with enhanced peak currents, which proved the positive effects of the composite including the high conductivity of bimetal, the catalytic activity of noble metal and the large-surface of porous carbon with excellent adsorption ability. Under the optimal conditions the oxidation peak currents of baicalein were linear with the concentration in 0.48–2.0 μmol L−1 and 4.0–140.0 μmol L−1via differential pulse voltammetry and the limit of detection was calculated as 0.010 μmol L−1. The modified electrode was successfully applied to the detection of baicalein content in drug and human urine samples. Meanwhile, the low cost and facile preparation of oyster mushroom based BPC made it become a potential substrate material for electrode modification.