The amperometric response of catechol, phenol and BPA was
investigated to evaluate the analytical performance of the Gr–SP–
Tyr biosensor. Fig. 3(A) shows typical current–time response
curves recorded at the Gr–SP–Tyr/GCE biosensor with the succes-
sive additions of catechol (a), phenol (b) and BPA (c). Seen from
Fig. 3(B),