Table 3.
Stability for assay of daidzein and genistein in human plasma.
| Compound | Concentration (ng/mL) |
Short-term stability (8 hours, n=3) %Remaining |
Long-term stability (3 months, n=3) %Remaining |
Freeze-thaw stability (n=3) %Remaining |
Post-preparative stability (n=5) %Remaining |
|---|---|---|---|---|---|
| Daidzein | 110 | 98.42 | 105.19 | 86.26 | 98.01 |
| 2200 | 98.54 | 94.57 | 100.14 | 98.11 | |
| Average stability | 98.48 | 99.88 | 93.20 | 98.06 | |
|
| |||||
| Genistein | 110 | 99.56 | 104.44 | 91.15 | 96.76 |
| 2200 | 99.25 | 95.67 | 110.88 | 96.94 | |
| Average stability | 99.40 | 100.05 | 101.02 | 96.85 | |