Electrochemical determination of bisphenol A with a glassy carbon electrode modified with gold nanodendrites

Three-dimensional gold nanodendrites with (111)-oriented growth were fabricated on a glassy carbon electrode by one-step electrodeposition of AuCl4 (-) in the presence of L-asparagine. The gold nanodendrites were functionalized with 4-mercaptobenzoic acid (4-MBA), which showed the improved catalytic performance for sensitive and selective determination of bisphenol A (BPA) by differential pulse voltammetry. The oxidation peak currents of BPA at 514 mV showed linear responses to BPA concentrations from 0.05 to 55.0 mu M (R (2) = 0.995), with the detection limit of 1.2 nM (S/N = 3). The modified electrode was extended for trace detection of BPA in (spiked) real samples with satisfied results.