Table 4.
Recovery and matrix effect of four analytes in QC sample at three levels (n = 6).
| Analytes | QC levels | Recovery (%) | Matrix effect |
|---|---|---|---|
| PZA | Low | 87.04 | 0.99 ± 0.08 |
| Medium | 91.25 | 0.99 ± 0.04 | |
| High | 90.80 | 1.01 ± 0.05 | |
|
| |||
| INH | Low | 79.24 | 0.87 ± 0.04 |
| Medium | 89.56 | 0.92 ± 0.05 | |
| High | 81.68 | 0.95 ± 0.03 | |
|
| |||
| EMB | Low | 83.35 | 0.96 ± 0.04 |
| Medium | 87.46 | 1.00 ± 0.03 | |
| High | 86.58 | 1.01 ± 0.04 | |
|
| |||
| RFP | Low | 95.01 | 0.97 ± 0.12 |
| Medium | 89.70 | 1.05 ± 0.06 | |
| High | 94.16 | 0.99 ± 0.05 | |
PZA: pyrazinamide, INH: isoniazid, RFP: rifampicin, EMB: ethambutol, and QC: quality control.