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| Sample | Levodopa added (μM) | Piroxicam added (μM) | Levodopa | Piroxicam | ||||
|---|---|---|---|---|---|---|---|---|
| Found (μM) | Recovery (%) | RSD (%) | Found (μM) | Recovery (%) | RSD (%) | |||
| Blood serum | — | — | <Detection limit | — | — | <Detection limit | — | — |
| 15.00 | 10.00 | 15.26 ± 0.29 | 101.7 | 1.9 | 10.5 ± 0.16 | 105 | 1.5 | |
| 30.00 | 20.00 | 30.7 ± 0.41 | 102.3 | 1.3 | 20.6 ± 0.26 | 102.6 | 1.2 | |
| Human urine | — | — | <DL | — | — | <DL | — | — |
| 15.00 | 10.00 | 14.6 ± 0.27 | 97.3 | 5.7 | 9.4 ± 0.3 | 93.6 | 3.2 | |
| 30.00 | 20.00 | 30.32 ± 0.41 | 101.0 | 1.4 | 19.4 ± 0.23 | 102 | 2.8 | |
