Table 2.
Antioxidant activity of HT and HT monoesters by DPPH and FRAP. Fresh samples or samples stored for 3 months at 4 °C were analyzed. The results of the DPPH assays are expressed as a percentage of relative antioxidant activity with respect to the blank methanol. The ferric-reducing activity determined by FRAP is expressed as µM Trolox equivalent/nmol of sample). N.D.: Not determined.
| Entry | DPPH Relative Antiox. Activ. (%) | FRAP (µM TE/nmol Sample) |
||
|---|---|---|---|---|
| Fresh | Stored 4 °C | Fresh | Stored 4 °C | |
| Vit C | 49.3 ± 12.7 | N.D. | N.D. | N.D. |
| HT | 92.9 ± 0.0 | 89.8 ± 3.7 | 2.0 ± 0.1 | N.D. |
| HT-C6 | 93.1 ± 3.3 | 92.7 ± 3.3 | 1.5 ± 0.0 | 2.2 ± 0.2 |
| HT-C8 | 95.6 ± 0.1 | 92.7 ± 3.6 | 1.6 ± 0.2 | 2.3 ± 0.1 |
| HT-C10 | 95.5 ± 0.8 | 92.2 ± 3.4 | 2.4 ± 0.0 | 1.9 ± 0.0 |
| HT-C12 | 95.9 ± 0.3 | 92.7 ± 3.1 | 2.2 ± 0.1 | 2.0 ± 0.0 |
| HT-C14 | 88.7 ± 12.0 | 72.9 ± 3.1 | 1.9 ± 0.1 | 1.4 ± 0.0 |
| HT-C18:1 | 95.4 ± 0.5 | 92.8 ± 3.5 | 2.9 ± 0.3 | 4.9 ± 0.0 |