Table 3.

Antioxidant activities of quinoa seeds cultivated in Korea, USA, and Peru

Quinoa extract	FRAP (mM Fe2+/kg dry material)	DPPH RSA (%)
		Concentration (mg/mL)
		0.025	0.05	0.1	0.2	2	20	IC501)
Korea	13.13±0.22a	25.00±0.45b	25.34±0.67b	35.69±0.57a	46.22±0.16a	70.46±0.14a	95.29±1.18a	0.25±0.01b
USA	8.42±0.06b	27.26±1.70a	29.72±1.38a	31.73±0.44b	40.27±0.16b	69.79±0.96a	94.50±0.66a	0.26±0.03b
Peru	7.12±0.20c	26.00±0.42ab	26.25±0.75b	32.97±1.05b	35.42±0.05c	61.44±0.81b	85.16±0.92b	0.47±0.02a

Means in a column with different letters (a–c) are significantly different by Duncan’s multiple range test at P<0.05.

FRAP, ferric reducing antioxidant power; DPPH RSA, 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assay.

¹⁾Concentration of the extract in mg/mL that was able to scavenge half of the DPPH radical.