| Storage conditions |
9-cRA |
4-oxo-9-cRA |
| Spikedconc. (ng/mL) |
Mean observed conc. (ng/mL) |
% CV |
% change |
Spiked conc. (ng/mL) |
Mean observed conc. (ng/mL) |
% CV |
% change |
| Bench top stability(~ 6.5 h, in ice cold water bath) |
8.14 |
8.16 |
4.7 |
0.25 |
6.68 |
6.71 |
5.5 |
0.45 |
| 378.57 |
377.45 |
1.4 |
-0.30 |
151.87 |
150.23 |
5.6 |
-1.08 |
| Freeze-thaw stability(three cycles) |
8.14 |
8.21 |
3.5 |
0.86 |
6.68 |
6.76 |
7.6 |
1.20 |
| 378.57 |
390.58 |
3.3 |
3.17 |
151.87 |
153.21 |
3.9 |
0.88 |
| Auto sampler stability(~ 128 h, at 5°C) |
8.14 |
8.30 |
2.2 |
1.97 |
6.68 |
6.76 |
4.3 |
1.20 |
| 378.57 |
378.23 |
2.4 |
-0.09 |
151.87 |
149.23 |
2.9 |
-1.74 |
| Long term stability(128 days, below -50°C) |
8.14 |
8.40 |
0.9 |
3.19 |
6.68 |
6.81 |
3.2 |
1.95 |
| 378.57 |
392.57 |
2.2 |
3.70 |
151.87 |
152.30 |
3.5 |
0.28 |
