We correct an error to our previous article. In Figure 5 and the text description of that data; iron concentrations were incorrectly labeled as μM, but they should have been mM. No conclusions of the paper are changed. The corrected text and figure are:
Figure 5.
Average spectra of iron loaded S. officinalis eumelanin obtained by varying the initial concentration of iron(III) chloride.
“Figure 5 shows the pump–probe response of EDTA washed S. officinalis eumelanin loaded with different initial concentrations of iron(III) chloride. The eumelanin is saturated with iron when the initial concentration of iron is greater than 1 mM.9 Increasing the initial iron concentration causes the negative signal when the pulses are overlapped (at t = 0) to appear and the positive signal when the pump precedes the probe (t > 0) to disappear; the 0.25 mM is similar to the S. officinalis eumelanin spectrum given in Figure 1. This value is approximately in agreement with the reported concentrations found in natural S. officinalis melanin.9”