Table 3.
Pearson correlation coefficients between phenolic compounds and antioxidant index (n = 15). DPPH (2,2-diphenyl-1-picrylhydrazyl) (IC50): IC50 of DPPH radical-scavenging activity; ferric-reducing antioxidant power (FRAP) (EC50): EC50 of FRAP; SOD: superoxide dismutase; GSH-px: glutathione peroxidase; MDA: malonaldehyde).
| Assays | DPPH (IC50) | FRAP (EC50) | SOD | GSH-px | MDA |
|---|---|---|---|---|---|
| total phenolic compounds (TPC) | −0.991 ** | −0.796 | 0.775 | 0.528 | −0.878 * |
| total phenolic acids (TPA) | −0.373 | −0.732 | 0.010 | 0.249 | −0.090 |
| total flavonoids (TF) | −0.950 * | −0.655 | 0.814 | 0.493 | −0.903 * |
| 3-O-caffeoylquinic acid (P1) | −0.195 | −0.452 | −0.182 | 0.419 | 0.070 |
| 4-O-caffeoylquinic acid (P2) | −0.312 | −0.553 | 0.314 | −0.323 | −0.256 |
| 4,5-di-O-caffeoylquinic acid (P3) | −0.392 | −0.597 | 0.378 | −0.266 | −0.331 |
| quercetin-3-O-glucuronide (F1) | −0.898 * | −0.700 | 0.559 | 0.287 | −0.698 |
| quercetin-3-O-galactoside (F2) | −;0.716 | −0.530 | 0.500 | −0.004 | −0.584 |
| isoquercitrin (F3) | −0.687 | −0.698 | 0.242 | 0.684 | −0.413 |
| kaempferol-3-O-glucuronide (F4) | −0.768 | −0.584 | 0.871 | 0.312 | −0.855 |
| kaempferol-3-O-glucoside (F5) | −0.654 | −0.420 | 0.560 | 0.955 * | −0.655 |
| quercetin-3-O-rhamnoside (F6) | −0.939 * | −0.639 | 0.735 | 0.467 | −0.848 |
| kaempferol-3-O-rhamnoside (F7) | −0.874 | −0.426 | 0.883 * | 0.716 | −0.954 * |
* and ** indicate correlation is significant at the 0.05 and 0.01 level, respectively.