| pH | Concentration, mM | Buffer | Purity, % | Yield, % |
| 7 | 10 | K2HPO4 | 87.5 ± 0.4 | 79.0 |
| 7 | 10 | TEAB | 92.6 ± 0.1 | 74.9 |
| 7 | 10 | TEAA | 90.6 ± 0. | 72.1 |
| 7 | 10 | NH4CH3CO2 | 84.3 ± 0.5 | 69.9 |