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Contents of some marker components in true and fake Indigo Naturalis.
| Ingredient (wt%) | True Samples | Fake Samples | ||||||
|---|---|---|---|---|---|---|---|---|
| Mean ± Std | Max | Min | F1 | F2 | F3 | F4 | F5 | |
| Indigo | 2.28 ± 0.51 | 3.47 | 1.18 | N.D. | N.D. | N.D. | N.D. | N.D. |
| Indirubin | 0.17 ± 0.04 | 0.26 | 0.09 | N.D. | N.D. | N.D. | N.D. | N.D. |
| Calcium | 28.11 ± 2.97 | 38.47 | 23.65 | 7.01 | 7.10 | 6.97 | 10.91 | 1.47 |
N.D.: Not detected by the HPLC method used in this research.
