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Linear relationship of five reference compounds and content in ASR
| Compounds | Linear regression equations | R 2 | Percentages (X ± SD, %) |
|---|---|---|---|
| Aloe-emodin | Y = 32.213X − 2.5027 | 0.9935 | 0.68 ± 0.02 |
| Rhein | Y = 26.927X + 2.1962 | 0.9660 | 0.24 ± 0.05 |
| Emodin | Y = 58.806X − 1.7350 | 0.9781 | 0.78 ± 0.07 |
| Chrysophanol | Y = 9.5589X + 2.4501 | 0.9935 | 6.68 ± 0.97 |
| Physcion | Y = 131.49X − 10.569 | 0.9817 | 0.58 ± 0.15 |
