Table 2.
Phenolic compounds of P. tuberosa (µg/g).
| No | Phenolic compounds | RT (min) | P. tuberosa (flower) | P. tuberosa (aerial part) | P. tuberosa (underground) |
|---|---|---|---|---|---|
| 1 | Protocatechuic acid | 8.75 | 1.24 ± 0.15 | 1.49 ± 0.22 | 0.36 ± 0.04 |
| 2 | Chlorogenic acid | 12.35 | 12.47 ± 0.77 | 30.95 ± 0.63 | 9.79 ± 0.18 |
| 3 | Ferulic acid | 22.14 | 25.31 ± 0.68 | 47.82 ± 0.80 | 32.56 ± 0.45 |
| 4 | Coumarin | 24.49 | 11.62 ± 0.51 | 14.91 ± 0.74 | nd |
| 5 | Rutin | 25.30 | 6.47 ± 0.37 | 8.34 ± 0.43 | 3.95 ± 0.12 |
| 6 | Ellagic acid | 26.11 | 2.43 ± 0.19 | 2.76 ± 0.11 | 0.22 ± 0.03 |
| 7 | Rosmarinic acid | 26.77 | 8.97 ± 0.45 | 14.51 ± 0.34 | nd |
| 8 | Quercetin | 30.83 | 5.37 ± 0.36 | nd | nd |
| 9 | Luteolin | 31.70 | 9.72 ± 0.62 | 4.40 ± 0.42 | nd |
| 10 | Kaempferol | 33.21 | 2.58 ± 0.18 | 2.05 ± 0.23 | nd |
aValues expressed are means ± S.E.M. of three parallel measurements (p < 0.05). nd: not detected.