The antioxidant activity of apple was positively correlated with the total polyphenolic concentrations of both TPC and TPI, the concentration of flavan-3-ols/procyanidins at the group level, and procyanidin B2 and epicatechin at the individual compound level. We therefore conclude that the flavan-3-ols/procyanidins are the most important contributors to the in Vitro antioxidant activity of apple and that procyanidin B2 and epicatechin are the most important individual antioxidants in apple. ็็Hydroxycinnamic acids may have a significant role in the flesh.