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Results of total anthraquinone yield by different extraction methods of Radix et Rhizoma Rhei
| Extraction method | Total anthraquinone yield (%) | Extraction rate (%) |
| Reference medicinal material | 5.282 | - |
| Ethanol extraction method | 3.054 | 57.819 |
| Water extraction method | 2.079 | 39.360 |
