The electrocatalytic characteristics of poly(azure B) and its application in the sensitive determination of hydroquinone

Abstract

Poly(azure B) (PAB) electropolymerized on a glassy carbon electrode (GCE) can effectively catalyze the oxidation and reduction of hydroquinone (HQ), with PAB acting as an electron transfer mediator. Compared with a bare GCE, the PAB-modified GCE significantly enhances the peak current and reduces the oxidation peak potential of HQ. The current of HQ on the PAB-modified GCE is proportional to its concentration, and thus provides an efficient approach for the determination of HQ. Under optimal conditions, the PAB-modified GCE displays a linear response for 8 to 4000 μM HQ, and the detection limit is 4.8 μM (S/N = 3). Moreover, it was found that catechol, an important isomer of HQ, does not interfere in the determination of HQ using the PAB-modified GCE.