Low-frequency, green sonoextraction of antioxidants from tree barks of Hungarian woodlands for potential food applications

The present work evaluates and compares the antioxidant capacities of bioactive constituents in barks ten common wood species from Hungary (Quercus rubra, Prunus serotina, Quercus robur, Betula pendula, Fraxinus excelsior, Robinia pseudoacacia, Carpinus betulus, Picea abies, Alnus glutinosa, Pinus sylvestris). Low-frequency ultrasound was used for intensification extraction bark to obtain extracts rich polyphenolic antioxidants with potential applications food industry. extractions were carried out different aqueous organic solvents- ethanol 80 % acetone at optimized conditions. overall capacity estimated by combined evaluation Folin-Ciocâlteu total phenol content (TPC), 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2?-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) ferric reducing ability plasma (FRAP) assays using a scoring system. Aqueous had better efficiency than as solvent medium. Of all investigated species, robur showed maximum TPC 105.88 ± 17.75 mg GAE/g dw, DPPH (IC50) 1.90 0.10 ?g/mL, ABTS 437.09 36.22 TE/g dw FRAP 102.62 8.69 AAE/g dw. characterization pseudoacacia excelsior done liquid chromatography/tandem mass spectrometry.