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(A) DPVs of the ARS-immobilized (PEI/CMC)10PEI film-coated Au electrode in 1 mM PBA solution (10 mM HEPES buffer at pH 7.5) in the presence of 0–10 mM L-dopa; (B) Relative intensity of peak currents in DPVs at ca. −0.59 V (a) and ca. −0.47 V (b) as a function of the concentration of L-dopa. I denotes the peak current in the presence of L-dopa, while I0 is the peak current in the absence of L-dopa.
