Modelling the interactions between free phenols, l-ascorbic acid, apple polyphenoloxidase and oxygen during a thermal treatment

► Study of chlorogenic acid (CG), epicatechin (EPI), apple polyphenoloxidase (PPO) and/or ascorbic acid (AA) model solutions. ► Rates of CG, EPI, PPO and/or AA degradation at pH 3.8 were determined at 20 and 50 °C. ► Kinetic rates of component interactions as a function of temperature were established. ► A stoechiokinetic model of coupled reactions between CG, EPI, PPO and AA was proposed.