The focus of this study was to electrochemically characterize tannin monomers of flavan-3-ols commonly found in red wine using cyclic voltammetry and chronoamperometry. Prior research involving the cyclic voltammetry of phenolics includes their determination in red wines, the evaluation of phenolics as antioxidants, and the correlation of tactile response, such as astringency to electrochemical response. It is expected that electrochemically determined physical parameters of flavan-3-ols, such as diffusion coefficients, would be inversely related to perceived astringency in red wines. Cyclic voltammetry and chronoamperometry were used to determine the diffusion coefficient of catechin and epicatechin using a 3-mm glassy carbon working electrode and a model wine matrix (12% (v/v) ethanol, 0.033 M l-tartaric acid, pH 3.57). The peak potential was determined to be 415 mV (vs Ag/AgCl) for both flavan-3-ol monomers. Chronoamperometry was run in triplicate with a high potential of +50, +100, +150, and +200 mV of the peak anodic potential of each monomer. Preliminary results by cyclic voltammetry gave diffusion coefficients of (2.40±0.16) x 10-6 cm2/sec which is in good agreement with previous investigations in this laboratory.