Table 1.
Orthogonal design and experimental results.
| No. | Ethanol concentration | Solid-liquid ratio | Number of extractions | Ultrasonic time | TPC (mg/g) | Chlorogenic acid (mg/g) |
|---|---|---|---|---|---|---|
| 1 | 1 | 1 | 1 | 1 | 3.48 ± 0.38 | 0.89 ± 0.07 |
| 2 | 1 | 2 | 2 | 2 | 5.81 ± 0.44 | 1.36 ± 0.12 |
| 3 | 1 | 3 | 3 | 3 | 4.47 ± 0.41 | 1.02 ± 0.11 |
| 4 | 2 | 1 | 2 | 3 | 5.01 ± 0.46 | 1.19 ± 0.14 |
| 5 | 2 | 2 | 3 | 1 | 4.31 ± 0.41 | 0.98 ± 0.12 |
| 6 | 2 | 3 | 1 | 2 | 3.53 ± 0.37 | 0.86 ± 0.06 |
| 7 | 3 | 1 | 3 | 2 | 5.21 ± 0.47 | 1.29 ± 0.13 |
| 8 | 3 | 2 | 1 | 3 | 4.23 ± 0.39 | 1.13 ± 0.09 |
| 9 | 3 | 3 | 2 | 1 | 5.57 ± 0.52 | 1.39 ± 0.12 |
| K1t | 4.59 | 4.56 | 3.75 | 4.45 | ||
| K2t | 4.28 | 4.78 | 5.46 | 4.85 | ||
| K3t | 5.00 | 4.52 | 4.46 | 4.57 | ||
| Rt | 0.72 | 0.26 | 1.71 | 0.39 | ||
| K1c | 1.09 | 1.12 | 0.96 | 1.09 | ||
| K2c | 1.01 | 1.16 | 1.31 | 1.17 | ||
| K3c | 1.27 | 1.09 | 1.10 | 1.11 | ||
| Rc | 0.26 | 0.07 | 0.35 | 0.08 |
t: total phenolic compounds; c: chlorogenic acid.