Evaluation of trans-resveratrol level in grape wine using laser-induced porous graphene-based electrochemical sensor.

trans-Resveratrol (TRA), is one of the indicators to evaluate the quality of red wines. In this study, a novel flexible electrochemical sensor using direct laser-induced graphene (LIG) technique that transforms the commercial Kapton tape into three-dimensional (3D) porous graphene was developed for sensitive detection of TRA molecules in red wines. For the first time, the strategy of 'double layer' (Kapton/polyimide) was employed to obtain the LIG with undamaged shape and excellent electrical properties. The mechanism of heat absorption and dissipation of laser-induced process was investigated in detail. The prepared electrochemical sensor with excellent repeatability, stability, reproducibility, and reliability, appears an excellent linear response within the TRA concentration range from 0.2 to 50 μmol L-1 and a low limit of detection (LOD) of 0.16 μmol L-1. Furthermore, the developed sensor can be applied for the evaluation of TRA level in red wines and grape skins with a satisfactory result. The sensor may be potential in analysis of active compounds in food or environmental samples.