Table 1.

Total phenolic and flavonoid contents and antioxidant activities of khat.

Samples	TPC (µgGAE/1 mg extract)	TFC (mg QE 1 g extract)	FRAP value	DPPH scavenging activity (IC50) µg/ml	ORAC
					AUC	Equivalent conc. Trolox @ 100 μg/mL
Khat	293.01 ± 12.5	76.10 ± 1.8	4514 ± 100.8	15.8 ± 1.8	46.1	900.16 ± 0.91
Gallic acid			2645.6 ± 124.8	7.18 ± 0.98
Querciten			1925.2 ± 29.8	8.2 ± 0.28	12.4	198.2 ± 0.58

All samples and positive control were done in triplicates (n = 3). AUC: area under the curve was calculated for the sample, standard, and the positive controls from the equation mentioned earlier.