20.500.12556/RUL-163953 Apple pomace as a potential source of oxidative stress-protecting dihydrochalcones Among fruits, the apple is unique for producing large amounts of the dihydrochalcone phloridzin, which, together with phloretin, its aglycone, is valuable to the pharmaceutical and food industries for its antidiabetic, antioxidant, and anticarcinogenic properties, as well as its use as a sweetener. We analysed the phloridzin concentration, total phenolic content, and antioxidant activity in the peel, flesh, seeds, juice, and pomace of 13 international and local apple varieties. In the unprocessed fruit, the seeds had the highest phloridzin content, while the highest total phenolic contents were mostly found in the peel. In processed samples, phloridzin and the total phenolic compounds especially were higher mostly in juice than in pomace. Moreover, the total phenolic content was much higher than the phloridzin content. Juice showed the highest antioxidant activity, followed by the peel and flesh. Across all samples, antioxidant activity did not directly correlate with phloridzin concentrations, suggesting that the antioxidant activity ascribed to phloridzin may need re-evaluation. In the Ferric Reducing Antioxidant Power (FRAP) assay, phloridzin only showed antioxidant activity at high concentrations when compared to its aglycone, phloretin. Considering the large amounts of apple juice produced by the juice industry, residual pomace is a promising source of phloridzin. For technical use, processing this phloridzin to phloretin would be advantageous. apple Malus x domestica pomace juice juice processing phloridizin dihydrochalcones phenolics antioxidant activity Ferric Reducing Antioxidant Power (FRAP) jabolčne tropine kemična sestava polifenoli antioksidativno delovanje pridelava sokov fenolne spojine true false true Angleški jezik Slovenski jezik Članek v reviji 2024-10-14 15:08:05 2024-10-14 15:08:09 2024-10-16 03:31:13 0000-00-00 00:00:00 2024 0 0 12 str. iss. 10, art. 1159 Vol. 13 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 547 2076-3921 10.3390/antiox13101159 211469059 Clanek_2_-_Dunaj.pdf Clanek_2_-_Dunaj.pdf 1 5C79E393FBA277C7920967F9F44E6EEB 4bff52a7729344e3390a64cbf631bfb70222cb591d6db14c4e0aaa7aded90b55 a915bf1f-8a2e-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=193966 https://www.mdpi.com/2076-3921/13/10/1159 1 2375219b-8a2d-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=193964 Biotehniška fakulteta 0 0 0