BioaccessibilityIn Vitroof Nutraceuticals from Bark of SelectedSalixSpecies

Abstract

The aim of this study was to investigate and to compare the extractability, bioaccessibility, and bioavailabilityin vitroof antioxidative compounds from bark of selectedSalixspecies:S. alba (SA), S. daphnoides (SD), S. purpurea (SP),andS. daphnoides x purpurea (SDP)hybrid willow clones originating from their natural habitats and cultivated on the sandy soil. The highest amount of phenolic glycosides was found in the bark ofSDPandSD. The best source of phenolics was bark ofSDP. The highest content of flavonoids were found inSDbark samples, whereas the highest concentration of bioaccessible and bioavailable phenolic acids was determined inSDPbark. Bark of all testedSalixspecies showed significant antiradical activity. This properties are strongly dependent on extraction system and genetic factors. Regardless ofSalixgenotypes, the lowest chelating power was found for chemically-extractable compounds. Bark of allSalixspecies contained ethanol-extractable compounds with reducing ability. Besides this, high bioaccessibility and bioavailabilityin vitroofSalixbark phytochemicals were found. Obtained results indicate that extracts from bark testedSalixgenotypes can provide health promoting benefits to the consumers; however, this problem requires further study.