| Standard | Immunosensor | HPLC | RE%** | ||||
| DA, μg/mL | DA observed, μ/mL | Recovery % | RSD%* | DA observed, μ/mL | Recovery % | RSD%* | |
| 5.0 | 4.9 | 98 | 8 | 4.9 | 98 | 2 | 0 |
| 2.5 | 2.0 | 80 | 9 | 2.5 | 100 | 3 | -20 |
| 0.5 | 0.4 | 80 | 8 | 0.6 | 120 | 2 | -30 |