The effect of debittering by sonication in brine, NaOH and water on bioactive compounds, antioxidant activity of caper (<i>Capparis ovata</i> Desf.) young shoot and buds

Abstract The total carotenoid amounts of the caper young shoot and buds debittered by sonication in brine, NaOH and tap water were reported to be between 19.99 (control) and 37.23 μg g−1 (water) to 4.36 (control) and 20.38 μg g−1 (NaOH), respectively. Total phenolic contents of sonicated caper young shoot and buds in brine, NaOH and tap water were specified to be between 34.96 (NaOH) and 299.84 mg gallic acid equivalent (GAE)/100 g (control) to 45.04 (NaOH) and 373.12 mg GAE/100 g (control), respectively. Radical scavenging activity values of sonicated young shoots were measured between 1.26 (NaOH) and 7.58 mmol trolox equivalent (TE) kg−1 1,1-diphenyl-2-picrylhydrazyl (DPPH) (control). In addition to DPPH, antioxidant activity values of sonicated caper young shoot and buds were measured to be between 2.06 (NaOH) and 17.72 Ferric reducing antioxidant power (FRAP), mg g−1 (control) to 1.70 (NaOH) and 13.44 FRAP mg g−1 (control), respectively. Kaempferol quantities of sonicated caper young shoot were identified between 40.08 (control) and 53.83 mg/100 g (Brine). In general, the most reduction in phenolic components was observed in caper young shoot and buds sonicated in NaOH solution. The phenolic components of the caper young shoot and buds sonicated in different solutions showed changes on the solution type when compared to the control.