Table 1 Stability of CdTe/ZnS aqQDs in buffer solutions mimicking blood (pHÂ 7.4)
Time | Maximal emission (nm) | Relative fluorescent unit | Metal concentrations in filtrate (ng/ml) | Molar ratios of metals in filtrate | |||
|---|---|---|---|---|---|---|---|
| Â | Â | Â | Cd | Te | Zn | Cd:Te | Zn:Cd |
Initial time | 652 | 271.0 ± 6.5 | ND | ND | ND | ND | ND |
15 min | 652 | 270.5 ± 5.8 | 2.08 ± 0.12 | 0.81 ± 0.01 | 1.30 ± 0.01 | 2.92:1 | 1.08:1 |
30 min | 652 | 270.6 ± 7.9 | 7.20 ± 0.21 | 2.90 ± 0.02 | 4.08 ± 0.05 | 2.82:1 | 0.98:1 |
1 h | 652 | 270.0 ± 9.0 | 7.72 ± 0.48 | 2.88 ± 0.30 | 4.82 ± 0.12 | 3.05:1 | 1.08:1 |
6 h | 652 | 144.1 ± 12.8 | 8.52 ± 0.95 | 3.36 ± 0.45 | 5.02 ± 0.38 | 2.88:1 | 1.02:1 |
24 h | 652 | 104.2 ± 11.1 | 11.90 ± 1.06 | 4.91 ± 0.36 | 7.77 ± 1.01 | 2.75:1 | 1.13:1 |
2 d | 652 | 86.2 ± 10.9 | 12.87 ± 1.24 | 5.04 ± 0.44 | 9.08 ± 0.91 | 2.90:1 | 1.22:1 |
3 d | 652 | 55.2 ± 2.6 | 14.42 ± 1.80 | 5.63 ± 0.61 | 10.50 ± 1.08 | 2.91:1 | 1.26:1 |