Abstract
In this work, a new reduced graphene oxide–poly(safranine T) (rGO–PST) film was prepared on glassy carbon electrode (GCE) via one-step polymerization using rGO as an electron transfer mediator. The uniform structure of rGO–PST film was exhibited by scanning electron microscopy. Electrochemical characterization indicated that rGO–PST/GCE possessed much larger surface area and faster electron transfer rate constant compared with GCE. Furthermore, the rGO–PST/GCE exhibited strong catalytic ability and sensitive response to the oxidation of methyl jasmonate (MeJA) using derivative linear scan voltammetry. Under optimal working conditions, the oxidation current of MeJA linearly increased with its concentration in the range of 1.0–10 μM and 30–3000 μM after 2-min accumulation, along with a low detection limit of 0.5 μM. As an example of practical application, the rGO–PST/GCE was successfully employed for the determination of MeJA in jasmine essential oil and rice spikelets samples.
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