Abstract
Abstract Capsaicin (CAP) was used as a redox mediator and added to multi-walled carbon nanotubes (MWCNT) modified glassy carbon electrode (GCE), to be used in the quantitation of xanthurenic (XA), ascorbic (AA) and uric (UA) acids, along with the neurotransmitters dopamine (DA) and epinephrine (EP), one at a time, using cyclic voltammetry and chronoamperometry, in buffered aqueous solutions, pH 7.0. The presence, after oxidation of CAP on MWCNT/GCE, of two reversible redox systems, which can be understood through the formation of a reversible surface-confined quinone systems, is important for the redox catalysis. The obtained analytical curves for XA, AA, DA, EP and UA showed linear ranges, between 10 and 95, 5–75, 5–115, 50–1150 and 5–70 μmol L−1, respectively. The detection limits were 8.76, 1.95, 1.80, 7.20 and 1.56 μmol L−1 for XA, AA, DA, EP and UA, respectively. This oxidized CAP-based platform is reported for the first time and is able to detect the analytes at a micromolar level.
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