Quantification of petrobactin from IDM cultures of Bacillus anthracis Sterne 34F2 and ΔsodA1 with the addition of different concentrations of iron under high (high O2) and low aeration (low O2).

aConcentration of petrobactin is expressed as µg/ml of supernatant from IDM cultures of B. anthracis.bQuantification was performed three times from the independent extraction and values represent means ± standard deviations.