Table 1.
Antioxidant properties of the Zn 5-CQA, 5-CQA, L-ascorbic acid, butylated hydroxyanisol (BHA) and butylated hydroxytoluene (BHT) expressed as the ability to scavenge DPPH· radical (EC50) and ABTS·+ cation radical as well as FRAP and CUPRAC values (the concentrations of tested substances in the samples were * 25 µM, ** 50 µM).
| Compound | DPPH/EC50 (µM) | ABTS * I% | FRAP ** CFe2+ (µM) | CUPRAC ** Ctrolox (µM) |
|---|---|---|---|---|
| Zn 5-CQA | 5.45 ± 0.37 | 97.65 ± 1.25 | 385.56 ± 5.35 | 198.36 ± 6.28 |
| 5-CQA | 7.23 ± 0.76 | 89.53 ± 3.61 | 216.09 ± 4.15 | 129.58 ± 9.70 |
| L-ascorbic acid | 10.32 ± 0.98 | 86.76 ± 1.58 | 156.86 ± 2.02 | 25.57 ± 3.50 |
| BHA | 13.54 ± 1.61 | 88.38 ± 2.98 | 141.82 ± 3.58 | 83.55 ± 14.97 |
| BHT | 53.14 ± 1.05 | 62.66 ± 5.65 | 134.40 ± 2.69 | 74.81 ± 7.57 |