Table 2.
Total anthraquinone yield by ethanol extraction of Radix et Rhizoma Rhei
| Number of times | Solvent volume (ml) | Time (min) | Total anthraquinone yield (%) |
| 1 | 50 | 60 | 2.025 |
| 2 | 40 | 30 | 0.512 |
| 3 | 30 | 30 | 0.348 |
| 4 | 30 | 30 | 0.169 |
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