Table 2.
Concentrations of main phenolic compounds in nettle extracts obtained by different methods with1:30 solid to solvent ratio and detected by HPLC (mg/g dry material)
| Extraction method | Gallic acid | Caffeic acid | Chlorogenic acid | p-Coumaric acid | Naringenin | Naringin |
|---|---|---|---|---|---|---|
| Microwave, 407 W, 10 min | 1.125 | 1.223 | 4.798 | 1.157 | 5.582 | 0.665 |
| Conventional, 30 min | 1.256 | 1.327 | 5.108 | 1.255 | 6.034 | 0.865 |
| Ultrasound, 80 % power, 30 min | 1.209 | 1.289 | 4.453 | 1.100 | 5.735 | 0.784 |
| Maceration, 24 h | 1.185 | 1.343 | 5.009 | 1.180 | 5.881 | 0.779 |