Table 2.
Recovery (%) of tetracyclines spiked in different concentration levels
| Spiked samples | Oxytetracyclin | Tetracycline | Chlortetracycline | Doxycyclin | Total |
|---|---|---|---|---|---|
| 100 ng/ml | 68.67 ± 8.6a | 90.73 ± 3.4 | 69.1 ± 3.1 | 62.4 ± 10.4 | 72.73 ± 19.1 |
| Precision | 0.41b | 0.69 | 5.29 | 19.04 | 1.02 |
| 200 ng/ml | 63.67 ± 7.9 | 84.68 ± 2.3 | 59.76 ± 2.8 | 65.64 ± 3.1 | 67.99 ± 6.1 |
| Precision | 0.62 | 0.84 | 2.21` | 2.34 | 0.16 |
| 300 ng/ml | 68.14 ± 13.2 | 72.93 ± 11.2 | 65.17 ± 3.5 | 71.47 ± 5.9 | 69.16 ± 17.4 |
| Precision | 0.99 | 1.63 | 1.78 | 2.84 | 0.46 |
| Mean | 66.83 ± 9.9 | 82.78 ± 5.6 | 64.68 ± 3.1 | 66.52 ± 6.4 | 69.96 ± 14.2 |
| Precision | 0.78 | 1.06 | 3.09 | 8.07 | 0.67 |
| n = 20 |
aMeans of recovery data ± standard deviation for 20 measurements
bPrecision is expressed as the percentage of relative standard deviation (RSD)