Free radical scavenging activity of flavonol, ibuprofen, Ir(iii) complex and ascorbic acid as standard reference towards HO˙, NO˙, DPPH˙ and ABTS˙+.
| Radical | IC50a (μM) | |||
|---|---|---|---|---|
| Flavonol | Ibuprofen | Ir(iii) complex | Ascorbic acid | |
| DPPH˙ | 85.32 ± 0.10* | 143.55 ± 0.20** | 8.32 ± 0.05** | 14.25 ± 0.18*** |
| HO˙ | 138.24 ± 0.12** | 105.23 ± 0.05** | 19.32 ± 0.05* | 28.12 ± 0.10*** |
| NO˙ | 97.27 ± 0.12* | 127.13 ± 0.05*** | 25.42 ± 0.05* | 43.27 ± 0.14** |
| ABTS˙+ | 110.74 ± 0.12*** | 76.25 ± 0.10* | 10.14 ± 0.10*** | 65.31 ± 0.15** |
a
All values are the means of three measurements and given as mean ± SD. Statistically significant differences are indicated by asterisks (***p < 0.001, **p < 0.01, *p < 0.05 compared to ascorbic acid).