Low concentration of sodium bicarbonate improves the bioactive compound levels and antioxidant and α-glucosidase inhibitory activities of tartary buckwheat sprouts

Abstract

This study aimed to investigate the effects of different concentrations of sodium bicarbonate (NaHCO₃) on the accumulation of flavonoids, total phenolics and d-chiro-inositol (DCI), as well as the antioxidant and α-glucosidase inhibitory activities, in tartary buckwheat sprouts. Treatment with low concentrations of NaHCO₃ (0.05, 0.1, and 0.2%) resulted in an increase in flavonoids, total phenolic compounds and DCI concentrations, and improved DPPH radical-scavenging and α-glucosidase inhibition activities compared with the control (0%). The highest levels of total flavonoids (26.69mg/g DW), individual flavonoids (rutin, isoquercitrin, quercetin, and kaempferol), total phenolic compounds (29.31mg/g DW), DCI (12.56mg/g DW), as well as antioxidant and α-glucosidase inhibition activities, were observed in tartary buckwheat sprouts treated with 0.05% NaHCO₃ for 96h. These results indicated that appropriate treatment with NaHCO₃ could improve the healthy benefits of tartary buckwheat sprouts.

Keywords: DPPH radical-scavenging activity; Flavonoids; Tartary buckwheat; Total phenolic compounds; d-chiro-inositol; α-Glucosidase inhibitory activity.