Table 1.
In vitro antioxidant studies.
| Parameters | TOL | TOR | p-Value |
|---|---|---|---|
| ABTS (TEAC/mg extract) | 405 ± 0.1 | 171.5 ± 1.0 | p < 0.01 |
| DPPH (EC50 expressed in mg/mL) | 0.4 | 1.3 | p < 0.01 |
| TOTAL PHENOLICS (GAE/mg extract) | 4.4 ± 0.1 | 1.1 ± 0.01 | p < 0.01 |
| TOTAL FLAVONOID (QE/mg extract) | 23.2 ± 0.1 | 0.02 ± 0.1 | p < 0.01 |
| FRAP (AAE/mg extract) | 156.1 ± 5.3 | 40.4 ± 0.3 | p < 0.01 |
| Total Phenolics vs FRAP correlation (R2) | 0.93 * | 0.38 | p < 0.05 |
Total phenolic and flavonoids content, free radical scavenging activity and antioxidant capacities of TOL and TOR extracts. TOL = T. officinale leaf; TOR = T. officinale root. TP = Total phenolic content (Gallic acid equivalent/mg extract); TF = Total flavonoid content (Quercetin equivalent/mg extract); EC50 = 50% effective concentration; FRAP = Ferric reducing antioxidant power (Ascorbic acid equivalent/mg extract). R2 = correlation coefficient. Data are expressed as the mean ± standard error of mean. * p < 0.05 compared to TOR.