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Figure 4
X-ray induced photoreduction of FeIII as influenced by chelation, comparing FeIII and FeII chelated with phytate (a, b), citrate (c, d) or cysteine (e, f) (Experiment 4). Both hydrated and freeze-dried forms were compared. (a), (c), (e) Fe K-edge XANES spectra of the FeIII complex (hydrated and freeze dried) compared with the FeII complex (hydrated). In (b, d, f), hydrated (frozen) FeIII samples complexed with (b) phytate, (d) citrate and (f) cysteine, were scanned at constant energy corresponding to the white line peaks of FeII and FeIII sulfates (7126.1 or 7131.0 eV) for 300 s. At 7126.1 eV, a progressive increase in fluorescence intensity would correspond to the conversion of FeIII to FeII (and vice versa), while at 7131.0 eV, a progressive increase in fluorescence intensity would correspond to the conversion of FeII to FeIII (and vice versa).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 26| Part 4| July 2019| Pages 1272-1279
https://doi.org/10.1107/S1600577519004351
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