Bioaccessible and dialysable polyphenols in selected apple varieties following in vitro digestion vs. their native patterns

► Gastrointestinal digestion altered apple polyphenolic profile and concentrations. ► Chlorogenic acid was the major polyphenol in apples, but not following digestion. ► Degradation and isomerisation of chlorogenic acid occurred in intestinal phase. ► Complete flavan-3-ol (procyanidin B2, epicatechin) degradation occurred in intestinal phase. ► Lower amount of polyphenols potentially bioavailable after dialysis.