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Raman spectral characteristic peaks of the six reference substances.
| Adulterants | Structure | Raman Shift (cm−1) of Spot on TLC | Raman Shift (cm−1) of Reference Powder | Intensity |
|---|---|---|---|---|
| Prednisone (A) |
 |
1657 | 1658 | s |
| 1602 | 1607 | w | ||
| Prednisone acetate (B) |
 |
1658 | 1660 | s |
| 1603 | 1606 | w | ||
| Prednisolone (C) |
 |
1655 | 1658 | s |
| 1605 | 1604 | w | ||
| Hydrocortisone (D) |
 |
1652 | 1645 | s |
| 1614 | 1613 | s | ||
| Hydrocortisone acetate (E) |
 |
1628 | 1629 | s |
| 1617 | 1619 | s | ||
| Dexamethasone (F) |
 |
1661 | 1658 | s |
| 1605 | 1606 | w |
s, strong; w, weak.
