Abstract
The electropolymerization of cetyltrimethylammonium bromide (CTAB) on glassy carbon electrode (GCE) was carried out when GCE was cycled in 0.1 M sulfuric acid containing CTAB from − 0.8 V to 1.2 V for several cycles. Scanning electron microscopy (SEM) study confirmed the formation of nanoporous poly(CTAB) thin film on GCE, which is highly uniform and adhesive. Cyclic voltammetric (CV) shows that poly(CTAB)/GCE exhibited great catalytic capability for the oxidation of dopamine (DA), uric acid (UA), tryptophan (Trp) and theophylline (TP) by enhancing their oxidation currents. In pH 7.0 0.1 M PB solution containing DA, UA, Trp and TP, the linear calibration plots for DA, UA, Trp and TP were obtained over the range of 0.5–1000 μM, 1–1000 μM, 1–1000 μM and 0.5–1000 μM with detection limits of 0.11 μM, 0.33 μM, 0.44 μM and 0.11 μM, respectively. Satisfactory results were obtained when poly(CTAB)/GCE was applied to the simultaneous determination of DA, UA, Trp and TP in urine samples.
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