Table 6.
Inclusion constants KAO for gallates and values of the concentration of gallates required to reduce the DPPH• radical concentration by 50% (EC50 value) [178].
| AO | KAO (M−1) | 105 EC50 (M) | ||
|---|---|---|---|---|
| β-CD | HP-β-CD | 0 M β-CD | 11 mM β-CD | |
| Gallic acid | - | 551 | 6.5 ± 0.1 | 5.8 ± 0.1 |
| Methyl gallate | - | 595 | ||
| Ethyl gallate | - | 380 | ||
| Propyl gallate (PG) | 125 ± 11 a 105 ± 2 b |
343 ± 9 a 328 ± 7 b |
5.7 ± 0.1 | 3.9 ± 0.1 |
| Butyl gallate (BG) | 198 ± 13 a 200 ± 15 b |
706 ± 38 a | 5.2 ± 0.3 | 4.1 ± 0.2 |
| Octyl gallate (OG) | 4810 ± 98 b | 5.7 ± 0.1 | 4.1 ± 0.1 | |
Values from reference [32] obtained by a UV shift method, b phase-solubility method (buffered aqueous solution with citric acid-sodium citrate 0.04 M, pH 3.65).