Selective electrochemical determination of dopamine at p-nitroaniline film-hole modified glassy carbon electrodes

Abstract

ABSTRACT. Herein, we report determination of dopamine (DA) at modified glassy carbon electrode (GCE) with a film produced by reduction of diazonium generated from p-nitroaniline (PNA). Pores were created purposely by stripping pre-deposited gold nanoparticles (AuNPs) in the modifier film. The modified electrodes were characterized electrochemically by common redox probes: hydroquinone (HQ), hexacyanoferrate [(Fe(CN) . Comparison was made for the cyclic voltammetric and amperometric response of DA using the modified electrodes against the bare GCE in phosphate buffer solution (PBS) of pH 7.5. The bare and modified GCE showed a linear response to DA in the concentration range of 0.2-2.2 mM and 5-35 µM with detection limit of 0.015 mM and 0.6112 µM, respectively. The modified electrode showed high sensitivity, well selectivity, good anti-interference ability, durable stability and good electrode reproducibility for determining DA. The reported modified electrode is a promising sensor for use in electroanalysis of DA.

Preparation of voltammetric sensors for taurine detection from Cu(II)-loaded carbon materials

“…In particular, easy and powerful analytical approaches desired for food preservation and quality control can be easily achieved with accurate and sensitive sensors. In the preparation of such sensors, especially conductive carbon structures [20][21][22] and nanoparticles [23][24][25] are of great importance. Today, the importance and success of electrochemical sensors reinforced with carbon-based nanomaterials are increasing, as well as the number and variety of commercial electrodes used in the clinic and the field [26][27][28][29].…”