| Sample condition
|
Spiked concentration (μg/ml)
|
Mean determined
concentration
(µg/ml)
|
Accuracy
(%)
|
| Bench-top stabilitya |
0.1 |
0.096 |
96.00 |
|
|
1.0 |
0.97 |
97.00 |
|
|
2.0 |
1.99 |
99.50 |
| Freeze–thaw stabilityb
|
0.1 |
0.098 |
98.00 |
|
|
1.0 |
0.99 |
99.00 |
|
|
2.0 |
2.07 |
103.5 |
| One-week stabilityc
|
0.1 |
0.092 |
92.00 |
|
|
1.0 |
0.89 |
89.00 |
|
|
2.0 |
2.38 |
95.20 |
| aExposed at ambient temperature (25 °C) for 4h. |
| bAfter three freeze–thaw cycles |
| cStored at −16°C. |
|
