Abstract
Vanillin (VLN) is generally used in bakery food products as an aroma enhancer and flavoring agent. Hence it is important to develop a powerful and rapid tool to monitor the concentration of VLN levels concerning food safety. In this paper, a simple sensor was proposed by electropolymerized Aspartic acid (ASP) modified on Graphene and Graphite composite paste electrode (PASPMGN/CPE) for the detection of VLN by differential pulse voltammetry (DPV). PASPMGN/CPE ranked to have high electrocatalytic kinetics towards electro-oxidation of VLN, in optimized conditions. The electrochemical process of VLN is portrayed to be irreversible and adsorption-controlled kinetics by the cyclic voltammetry (CV) method. The surface features were studied using Field Emission Scanning Electron Microscopy (FE-SEM), Energy Dispersive X-ray Spectroscopy (EDX), Electrochemical Impedance Spectroscopy (EIS) and CV. From DPV results, the oxidative peak current showed linear growth toward the concentration of VLN ranging from 1.0 mu M to 15.0 mu M with a limit of detection and quantification of 4.85 mu M and 16.2 mu M. The modified sensor attained to be highly selective with common possible interferents. PASPMGN/CPE was efficient in detecting VLN in vanilla pods, essence and bakery product samples.