Table 3.
Antioxidant activity (oxygen radical absorbance capacity (ORAC)) and chemical stability of compounds 1 to 18.
| Compound | Chemical Structure | ORAC a | Aqueous Stability b(%) |
|---|---|---|---|
| 1 |
|
11.0 ± 0.4 | 2 |
| 2 |
|
8.1 ± 0.1 | - |
| 3 |
|
19.2 ± 0.2 | 77 |
| 4 |
|
14.4 ± 0.2 | 0 |
| 5 |
|
5.2 ± 0.4 | - |
| 6 |
|
9.4 ± 0.4 | 0 |
| 7 |
|
19.2 ± 0.4 | 90 |
| 8 |
|
19.3 ± 0.5 | 98 |
| 9 |
|
29.5 ± 0.5 | 0 |
| 10 |
|
27.6 ± 0.5 | 0 |
| 11 |
|
6.6 ± 0.1 | - |
| 12 |
|
12.5 ± 0.7 | 0 |
| 13 |
|
7.8 ± 0.3 | - |
| 14 |
|
9.6 ± 0.1 | 0 |
| 15 |
|
8.9 ± 0.4 | 90 |
| 16 |
|
11.9 ± 0.4 | 0 |
| 17 |
|
19.4 ± 0.7 | 93 |
| 18 |
|
15.3 ± 0.7 | 0 |
| Resveratrol |
|
8.1 ± 1.17 | - |
a µmol of trolox/µmol of pure compound. b Percentage of remaining pure compound (measured by HPLC) after two months at room temperature in aqueous solution (+20% acetonitrile).