New Voltammetric Sensor Based on LDH and H2O2 for L-Proline Determination in Red and White Wines

Taking inspiration from our recent work in which a new sensor for hydrogen peroxide was proposed, research group has now developed simple, fast, and inexpensive voltametric system determining proline concentration both standard solutions real samples (red white wines). This uses non-enzymatic based on working electrode of glassy carbon (GC) modified with layered double hydroxide (LDH) compound, the type GC-Ag(paste)-LDH-H2O2, solution at fixed concentration, three cyclic voltammetry setup. Using an increasing L-proline, method shows linearity range, semilogarithmic coordinates, between 125 μmol L−1 3200 proline, limit detection (LOD) value 85.0 quantitation (LOQ) 95.0 L−1. The is applied to determination several commercial Italian wines. results are compared those obtained by applying classic spectrophotometric ninhydrin, obtaining good correlation results.