Table 4.
In vitro antioxidant activity of S. rosmarinus extracts.
| S. rosmarinus | DPPH a Test IC50 (μg/mL) |
ABTS b Test IC50 (μg/mL) |
β-carotene Bleaching Test IC50 (μg/mL) |
FRAP c Test μM Fe (II)/g 1 |
|
|---|---|---|---|---|---|
| 30 min | 60 min | ||||
| R1 | 8.83 ± 0.82 ** | 1.48 ± 0.10 | 12.53 ± 1.20 **** | 8.87 ± 0.85 **** | 95.17 ± 6.62 |
| R2 | 8.80 ± 0.81 ** | 0.94 ± 0.09 | 7.18 ± 0.76 **** | 6.53 ± 0.65 **** | 80.09 ± 5.01 |
| R3 | 11.23 ± 1.14 **** | 1.57 ± 0.14 *** | 45.57 ± 3.90 **** | 26.61 ± 2.62 **** | 97.20 ± 6.30 |
| R4 | 14.76 ± 1.42 **** | 2.01 ± 0.24 | 10.84 ± 1.05 **** | 10.75 ± 1.03 **** | 76.77 ± 5.13 |
| Positive control | |||||
| Ascorbic acid | 5.02 ± 0.80 | 1.71 ± 0.06 | |||
| Propyl gallate | 0.09 ± 0.004 | 0.09 ± 0.004 | |||
| BHT | 63.20 ± 4.32 | ||||
Data are expressed as mean ± S.D. (n = 3). 1: tested at concentration 2.5 mg/mL. Differences within and between groups were evaluated by one-way analysis of variance test followed by a multicomparison Dunnett’s test α = 0.05 compared with the positive controls **** p < 0.0001, *** p <0.001, ** p < 0.01. a 2-diphenyl-1-picrylhydrazyl. b 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid. c Ferric Reducing Antioxidant Power.