Phenolic contents, antioxidant activities and potential bioaccessibilities of industrial pomegranate nectar processing wastes

Summary Antioxidant potential and bioaccessibility of co‐products from industrial pasteurised pomegranate nectar ( PN ) processing such as peel ( PP ), press cake ( PC ) and precipitate after clarification ( PAC ) in comparison with raw material (arils) and final products ( CON and PN ) were determined. Total phenolic ( TPC ), flavonoid ( TFC ), anthocyanin ( TAC ), tannin contents ( TTC ) and antioxidant activity ( TAA ) were determined besides identifying major phenolics and investigating in vitro bioaccessibility after gastrointestinal ( GI ) digestion. PP showed the highest values, except for TAC . Phenolics (12.7–43.0%) were found to be more stable than anthocyanins (0.6–2.1%) after in vitro GI digestion. PAC was found to be a better source for anthocyanins than CON and also showed higher phenolic bioaccessibility (28.8%) than PN (19.6%). PC and PAC possessed as much TPC , TFC , TTC and TAA levels as CON , with some exceptions. Therefore, these results indicated that not only PP but also PC and PAC should be valorised as a good source for phenolics and anthocyanins.