The role of germination in changes in bioactive properties, polyphenols and biogenic elements of raw and germinated barley (Hordeum vulgare) parts

Abstract

SummaryIn this study, the effect of germination in changes on total phenol, flavonoid contents, antioxidant capacity, polyphenols and biogenic elements of raw and germinated barley parts (radicle, foliole and germinated grain) was investigated. Total phenolic and flavonoid contents of raw and germinated barley parts were recorded to be between 97.61 (foliole) and 164.44 mgGAE/100 g (radicle) to 38.93 (germinated barley grain) and 371.07 mg/100 g (radicle), respectively. Antioxidant capacity results (DPPH and ABTS assays) were recorded between 3.37 (germinated barley grain) and 4.82 mmol kg−1 (radicle) to 0.79 (germinated barley grain) and 2.28 mmol kg−1 (radicle), respectively. The highest total phenol and flavonoid content as well as antioxidant capacity values were detected in radicle. Catechin and kaempferol values of raw and germinated barley parts (radicle, foliole and germinated barley grain) were recorded between 5.85 (germinated barley grain) and 19.71 mg/100 g (radicle) to 3.91 (germinated barley grain) and 4.62 mg/100 g (foliole), respectively. Gallic acid results of barley samples varied between 0.72 (germinated barley grain) and 10.95 mg/100 g (radicle). The phenolic compounds detected in the highest amounts in raw and germinated barley parts were catechin, kaempferol and gallic acid. P and K results of raw (control) and germinated barley parts were recorded to be between 727.64 (foliole) and 2078.10 mg kg−1 (control) to 955.40 (germinated barley grain) and 3982.63 mg kg−1 (control), respectively. As a micro elements, Fe and Zn results of barley samples were identified between 2.95 (foliole) and 14.30 mg kg−1 (control) to 6.26 (foliole) and 24.84 mg kg−1 (control), respectively. Significant decreases in macro and micro element contents were observed during the germination of barley grain compared to the control.