Development of electrochemical sensor based on β-cyclodextrin/K10 montmorillonite towards the enhanced electro-catalytic oxidation of isoorientin: A voltammetric study

The electrochemical oxidation and interfacial electron transfer behavior of isoorientin at carbon paste electrode (CPE) and carbon paste electrode modified with β-cyclodextrin/K10 Montmorillonite (β-CD/K10 Mt/MCPE) have been studied by employing cyclic voltammetry (CV), differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS). The modified electrode showed excellent electrocatalytic activity towards the determination of isoorientin oxidation in 0.1 M Britton-Robinson (BR) buffer solution of pH 3.0. The electrochemical process was found to be reversible and adsorption controlled. The experimental parameters which influence the determination of isoorientin such as effect of pH, scan rate, concentration, accumulation time, stability and repeatability have been optimized. The peak currents were found to be linear in the range of 2.5 × 10−7 to 2.5 × 10−5 M with the detection limit of 2.95 × 10−7 M, quantification limit of 9.86 × 10−7 M and correlation co-efficient of 0.9994, respectively. The effect of interference was also studied by employing DPV.