Electrochemical quantification of Vanillin using hydrazine derivative modified pencil graphite electrode

Herein this report, a disposable electrochemical sensor was developed by modifying pencil graphite electrode by Poly 2,4-dinitrophenylhydrazine (PDNPH) using electropolymerizing technique for the detection of Vanillin (Van) or 4-Hydroxy-3-methoxybenzaldehyde. Electrochemical estimation of Vanillin was done with the help of Cyclic Voltammetry and Differential pulse voltametric techniques. The morphological characteristics were studied using SEM analysis. A single oxidation peak was obtained for Vanillin at the potential of + 0.5214 V. The adapted electrode exhibits a linear range of 1 µM −900 µM with LOD of 0.34 µM. The PDNPH/PG electrode was then used for real sample quantification and it manifested RSD value less than 5 % which revealed that the developed sensor is a favorable tool for quantification of Van. This is the first-time reporting Vanillin determination by using a modified pencil graphite electrode as working electrode in supporting electrolyte PBS 7.