| compound | concentration (ng/mL) | autosampler for 24 h | freeze-thaw cycle | at −80˚C for 2 w | |||
| accuracy (%) | RSD (%) | accuracy (%) | RSD (%) | accuracy (%) | RSD (%) | ||
| Doxorubicin hydrochloride | 500 | 98.9 | 4.9 | 102.9 | 3.3 | 99.6 | 8.4 |
| 10,000 | 87.9 | 5.0 | 104.5 | 6.5 | 90.8 | 5.0 | |
| 100,000 | 92.3 | 2.3 | 105.4 | 3.3 | 104.5 | 7.5 | |