Cyclic voltammograms of 0.1 mM BPA at the Gr–SP–Tyr/GCE (a), Tyr/GCE (b), Gr–SP/GCE (c) and the unmodi- fied GCE (d) in an oxygen saturated PBS were depicted in Fig. 2. A
Cyclic voltammograms of 0.1 mM BPA at theGr–SP–Tyr/GCE (a), Tyr/GCE (b), Gr–SP/GCE (c) and the unmodi-fied GCE (d) in an oxygen saturated PBS were depicted in Fig. 2. A