Elevated and rapid voltammetric sensing of riboflavin at poly(helianthin dye) blended carbon paste electrode with heterogeneous rate constant elucidation

Abstract

The potent, selective, and consistent electrochemically polymerized helianthin dye modified carbon paste electrode (PHLDMCPE) was generated for the assessment of the significant antioxidant riboflavin (RL) with ascorbic acid (AA) and tyrosine (TR) using cyclic voltammetric (CV) and differential pulse voltammetric (DPV) techniques. The PHLDMCPE explicates a superior electrocatalytic resolution for the redox activity of 1 × 10−4 M RL in 0.1 M phosphate buffer solution (PBS) of pH 7.0 than the bare carbon paste electrode (BCPE). The oxidation peak current of RL and concentration of RL were attained linearly in the range of 60 µM to 150 µM with the lower limit of detection (LOD) of 4.02 × 10−8 M and the limit of quantification (LOQ) of 13.42 × 10−8 M, respectively. The heterogeneous rate constant for the equipped sensor was detected for RL at variable scan rates. This work conveys a modest and advisory methodology for the concurrent investigation of RL with AA and TR. The studied CV technique and developed sensor were adopted for the assessment of RL in pharmacological medication as a real sample. Electrochemically polymerized HLD modified carbon paste electrode was exposed for the evaluation of antioxidant riboflavin in both real and commercial samples in optimum circumstances using CV and DPV techniques. The selective resolution and interference study of riboflavin were done with ascorbic acid and tyrosine. The surface morphology of modified and unmodified carbon sensors was studied using FE-SEM and CV methods. The modified sensor exposes refined stability, reproducibility, and repeatability with a low LOD (4.02 × 10−8 M).