Table 1. Quantification of the petrobactin and bacillibactin siderophores produced by Bacillus anthracis Sterne 34F2 and the mutant ΔsodA1 under IDM cultures with the addition of different concentrations of iron.
| Iron (µM) | Petrobactin (µg/ml) a | Bacillibactin (µg/ml) a | ||
| Sterne 34F2 | ΔsodA1 | Sterne 34F2 | ΔsodA1 | |
| 0 | 132.430±11.035 b | 66.609±9.341 | 1.362±0.023 | 0.283±0.005 |
| 3 | 24.046±5.678 | 65.789±7.451 | 0.004±0.000 | 0.003±0.001 |
| 6 | 20.486±5.101 | 39.905±6.450 | 0.003±0.000 | 0.003±0.000 |
| 10 | 18.888±4.789 | 25.623±4.346 | 0.002±0.000 | 0.003±0.000 |
| 20 | 17.035±4.456 | 25.209±4.509 | 0.001±0.000 | 0.001±0.000 |
a
Concentration of siderophores petrobactin and bacillibactin is expressed as µg/ml of supernatant from IDM cultures of B. anthracis.
b
Quantification was performed three times from the independent extraction and values represent means ± standard deviations.