interference for the reduction detection of CC and HQ was
observed from the phenol and bisphenol A. However, a relatively
small current response for the reduction of p-cresol was
observed, suggesting a relatively small interference of p-cresol to
the determination of CC and HQ. The catalytic activities of the sensor
toward catecholamines such as dopamine were investigated.
Fig. 6B showed the typical current–time response curve of Pt-Au-
OSi@CS/GCE to dopamine. Inset showed cyclic voltammograms
(CVs) of the proposed sensor in a phosphate buffer solution (0.1 M,
pH 7.0) (line a) without and (line b) with dopamine at the scan rate
of 50 mV s−1. The result showed that the Pt-Au-OSi@CS nanocomposites
exhibited catalytic response for the reduction of dopamine.
However, dopamine is one of the important natural catecholamine
neurotransmitters for message transmission in the central nervous
system and it generally does not coexist with phenolic compounds