Table 4.

IC₅₀ of Uros and corresponding references on synthetic and oxygen free radicals.

Sample	Superoxide Radical 1	DPPH Radical	Peroxyl Radicals 2	ABTS Radical	Hydroxyl Radical
UroA	5.01 ± 5.01 μM	152.66 ± 35.01 μM	13.1 μM	---	---
Gallic acid	0.26 ± 0.21 μM	3.10 ± 3.11 μM	---	---	---
Ascorbic acid	---	14.81 ± 14.90 μM	---	---	---
Pomegranate extracts	---	---	0.49 μM	---	---
UroB	495.32 ± 3.28 mM	295.41 ± 2.36 mM	---	316.18 ± 1.85 mM	306.28 ± 4.61 mM
Ascorbic acid	874.39 ± 1.48 mM	446.25 ± 1.78 mM	---	526.24 ± 3.18 mM	540.16 ± 2.52 mM

IC₅₀ is expressed as mean ± SD, and data for peroxyl radicals are expressed as µmol Trolox equivalents per mg of sample. ¹ UroA scavenges superoxide radicals generated by the xanthine/xanthine oxidase system. ² The capacity of UroA to scavenge peroxyl radicals was measured by the oxygen radical antioxidant capacity (ORAC).