Bakkalbasi, EmreYilmaz, Ozay MentesYemis, OktayArtik, Nevzat2025-05-102025-05-1020131344-660610.3136/fstr.19.1052-s2.0-84879620095https://doi.org/10.3136/fstr.19.105https://hdl.handle.net/20.500.14720/1381Yemis, Oktay/0000-0002-7461-5185In this study, the effects of storage temperature, O-2 permeability of packaging materials and variety on phenolic content and free radical-scavenging activity of vacuum-packaged walnut kernels were studied over a 12 months storage period. Methyl gallate (23.70 - 93.75 mg/kg), ellagic acid (137.95 - 569.22 mg/kg), and an ellagic acid pentoside (270.59 - 637.17 mg ellagic acid equivalent/kg) were identified in walnut varieties. While a slight decrease in the amount of ellagic acid was observed during 12 months storage, decreases in the amount of ellagic acid pentoside, total phenolic content and free radical-scavenging activity were severe. The present study concluded that it is possible to protect the phenolic content and antiradical activity of walnut kernels by packaging in Polyamide/Polyethylene laminate pouches having an oxygen permeability lower than 63.40 +/- 0.40 (mL/m(2)/24h at 23 degrees C) under vacuum at 20 degrees C up to twelve months.eninfo:eu-repo/semantics/openAccessWalnutPhenolic ContentFree Radical-Scavenging ActivityStorageArticle191Q4Q4105112WOS:000315617100013