In this work, we focused on a novel sensitive voltammetric sensor based on porous alumina-borate oxide fibers (AlBFs) and reduced graphene oxide (RGO) modified carbon paste electrode for simultaneous determination of dopamine (DA) and noscapine (NOS) using differential pulse voltammetry (DPV), cyclic voltammetry (CV) and chronoamperometry (CA) methods to investigate their electrochemical behavior. Porous AlBFs were prepared via an electrospinning method using aluminium acetate stabilized with boric acid and polyvinyl pyrrolidone (PVP) as the precursors. The AlBFs were characterized using field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD) techniques as well as energy dispersive X-ray spectroscopy (EDX). In addition, the surface morphology of the modified electrode (RGO/AlBFs/CPE) was examined via FE-SEM imaging analysis. Due to electro-catalytic effect of RGO and AlBFs, the modified electrode was able to accelerate the electron transfer oxidation of DA and NOS and improve their oxidation currents. Using DPV method, the modified sensor showed wide linear ranges of 0.04-200 µM and 0.07-300 µM and low detection limits of 0.028 µM and 0.049 µM toward DA and NOS, respectively. The good stability, reproducibility and selectivity of the modified electrode can make it a promising electrochemical sensor for determination of DA and NOS in real samples with satisfactory results.
