*2.6. Ferric-Reducing Antioxidant Power*

The Benzie and Strain method [29] was used to evaluate the ferric-reducing antioxidant power (FRAP) of amaranth extracts. First, FRAP reagent was prepared. Next, the portions of 2.25 mL of this reagent were mixed with 225 μL of water and 75 μL of aqueous solution of amaranth extracts (1 mg/mL). Absorbance of mixtures was recorded at 593 nm after incubation at 37 ◦C for 30 min. FRAP results were expressed as μmol Fe2<sup>+</sup> equivalents per g of extract or per g of FM using the calibration curve for FeSO4.
