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Selected Physicochemical properties of the analytes, GC–MS retention times and prominent ions.
| Drug | Molecular Weight (before Derivatization) | Retention Time (min) | Selected Ion (m/z) | Structure of Polar Drugs (after Derivatization) |
|---|---|---|---|---|
| Ibuprofen | 206.28 | 12.36 | 161, 220, 117 |
|
| Ketoprofen | 254.28 | 17.01 | 209, 105, 268 |
|
| Diclofenac | 296.1 | 17.55 | 214, 242, 304 |
|
| Naproxen | 230.26 | 16.23 | 185, 244 |
|
| Pregabalin | 159.23 | 12.57 | 88,158,114 |
|
