Sensitive Voltammetric Sensor for Evaluation of trans-resveratrol Levels in Wines based on Poly(L-lysine) Modified Electrode

Abstract A novel, economic, and highly sensitive electrochemical sensor for the determination of trans -resveratrol ( RES ) was fabricated by electropolymerization of poly(L-lysine) films onto glassy carbon electrode ( GCE ) surface. The electrochemical behavior of RES in Britton–Robinson buffer solution (pH 2.0) on the poly(L-lysine)/GCE was investigated by cyclic voltammetry and linear sweep voltammetry for the first time. Results showed that the detection range of the proposed sensor to RES was from 0.20 to 12.0 μM with the minimum detectable concentration of 0.06 μM. The reported electrochemical sensor also exhibited high selectivity, good reproducibility, and long-term stability for RES detection. In addition, the proposed method can be employed for the determination of RES in red wines with satisfactory results. The proposed electrochemical strategy presents valuable information related to evaluation of RES levels in real samples.