2.6.3. Antioxidant capacity analyses
2.6.3.1. Ferric reducing/antioxidant power (FRAP) assay. was conducted as described by Alvarez-Parrilla et al. (2010). The fresh working solution was prepared by mixing 25 mL of 0.3 M acetate buffer, pH 3.6, 2.5 mL TPTZ solution (containing 10 mM TPTZ in 40 mM HCL), and 2.5 mL of 20 mM FeCl3 6H2O solution and then warmed at 37 °C before using. 24 μL sample extracts or Trolox standard were allowed to react with 180 μL of the FRAP solution and absorbance readings were taken after 30 min reaction using a multi-detection microplate reader (Biotek, Synergy HT, Winooski VT, USA) with Gen5 software. Increases in absorbance are due to Fe3+ reduction by antioxidants and the subsequent formation of a colored TPTZ–Fe2+ complex with an absorbance at 595 nm. The standard curve was used between 8.125 × 10−3 and 0.13 mmol Trolox and results were expressed in Trolox equivalent (TE; mmol/g dry matter).
2.6.3. Antioxidant capacity analyses2.6.3.1. Ferric reducing/antioxidant power (FRAP) assay. was conducted as described by Alvarez-Parrilla et al. (2010). The fresh working solution was prepared by mixing 25 mL of 0.3 M acetate buffer, pH 3.6, 2.5 mL TPTZ solution (containing 10 mM TPTZ in 40 mM HCL), and 2.5 mL of 20 mM FeCl3 6H2O solution and then warmed at 37 °C before using. 24 μL sample extracts or Trolox standard were allowed to react with 180 μL of the FRAP solution and absorbance readings were taken after 30 min reaction using a multi-detection microplate reader (Biotek, Synergy HT, Winooski VT, USA) with Gen5 software. Increases in absorbance are due to Fe3+ reduction by antioxidants and the subsequent formation of a colored TPTZ–Fe2+ complex with an absorbance at 595 nm. The standard curve was used between 8.125 × 10−3 and 0.13 mmol Trolox and results were expressed in Trolox equivalent (TE; mmol/g dry matter).
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