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Calibration curve of scoparone, geniposide and rhein.
| Constituents | Calibration Curve | Range (ng/mL) | R2 | LOD (ng/mL) |
|---|---|---|---|---|
| Scoparone | y = 0.0195x − 0.0136 | 5–500 | 0.9999 | 1 |
| Geniposide | y = 0.0075x − 0.0066 | 10–1000 | 0.9998 | 5 |
| Rhein | y = 0.007x − 0.001 | 10–1000 | 0.9999 | 5 |
