Table 1.
Influence of the pH on the stability of the iron-siderophore solution (ISS) Fe chelates.
| Bacterial origin of ISS |
Fe solubilized (%)a vs. pH | ||||
|---|---|---|---|---|---|
| 7.0 | 7.5 | 8.0 | 8.5 | 9.0 | |
| A. vinelandii | 64.7 ± 6.2 | 59.2 ± 5.2 | 60.0 ± 3.9 | 56.2 ± 4.8 | 61.8 ± 5.2 |
| B. subtilis | 4.6 ± 0.5 | 4.7 ± 1.5 | 5.0 ± 1.3 | 5.5 ± 2.1 | 6.6 ± 5.6 |
a
The amount of Fe in solution was measured after 3 days of equilibrium and expressed in percent relative to the initial Fe added. The data correspond to the mean values and standard deviations of two independent experiences performed in triplicate (n = 6).