Abstract
This study proposes a new electrochemical platform based on electroactive vanadium ferrites (VFe2O4) for the highly selective detection of dopamine (DA). VFe2O4 were synthesized with the sol–gel auto-ignition method and characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), impedance analyzer, and cyclic voltammetry. The characterization study revealed that the VFe2O4 have a single-cubic structure with agglomerated structure. The VFe2O4 showed the multi-ions-based increment in the dielectric constant. The VFe2O4 sensor was fabricated by drop-casting method on a glassy carbon (VFe2O4-GCE) electrode with the addition of Nafion and applied for electrochemical detection of DA (a common neurotransmitter) in pharmaceutical preparations and biological samples. The results of electrochemical analysis of DA in the concentration range of 0.05 – 12.3 µM by using VFe2O4-GCE showed a linear response (co-efficient of determination R2 = 0.995) with the limit of detection and quantification (LOD/LOQ) as 0.0087 and 0.029 μM, respectively.
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