NDLI: How does iron interact with sporopollenin exine capsules? An X-ray absorption study including microfocus XANES and XRF imaging

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Journal of Materials Chemistry B Vol - 2 Issue - 7

Journal of Materials Chemistry B Vol - 2 Issue - 6

Journal of Materials Chemistry B Vol - 2 Issue - 5

Journal of Materials Chemistry B Vol -1

How does iron interact with sporopollenin exine capsules? An X-ray absorption study including microfocus XANES and XRF imaging

Content Provider	Royal Society of Chemistry (RSC)
Author	Atkin, Stephen L. Mosselmans, J. Frederick W. Thomas, Michael F. Bras, Wim Diego-Taboada, Alberto Nikitenko, Sergey Quinn, Paul D. Archibald, Stephen J. Mackenzie, Grahame Young, Nigel A.
Copyright Year	2014
Abstract	Sporopollenin exine capsules (SECs) derived from plant spores and pollen grains have been proposed as adsorption, remediation and drug delivery agents. Despite many studies there is scant structural data available. This X-ray absorption investigation represents the first direct structural data on the interaction of metals with SECs and allows elucidation of their structure–property relationships. Fe K-edge XANES and EXAFS data have shown that the iron local environment in SECs (derived from Lycopodium clavatum) reacted with aqueous ferric chloride solutions is similar to that of ferrihydrite (FeOOH) and by implication ferritin. Fe Kα XRF micro-focus experiments show that there is a poor correlation between the iron distribution and the underlying SEC structure indicating that the SEC is coated in the FeOOH material. In contrast, the Fe Kα XRF micro-focus experiments on SECs reacted with aqueous ferrous chloride solutions show that there is a very high correlation between the iron distribution and the SEC structure, indicating a much more specific form of interaction of the iron with the SEC surface functional groups. Fe K-edge XANES and EXAFS data show that the FeII can be easily oxidised to give a structure similar to, but not identical to that in the FeIII case, and that even if anaerobic conditions are used there is still partial oxidation to FeIII.
Starting Page	945
Ending Page	959
Page Count	15
File Format	HTM / HTML PDF
ISSN	2050750X
Volume Number	2
Issue Number	8
Journal	Journal of Materials Chemistry B
DOI	10.1039/c3tb21523g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	SEC Lycopodium Sporopollenin Palynology Adsorption Drug delivery X-ray absorption spectroscopy X-ray absorption near edge structure Extended X-ray absorption fine structure Iron(III) chloride Ferrihydrite Ferritin X-ray fluorescence U.S. Securities and Exchange Commission Iron(II) chloride Anaerobic organism
Content Type	Text
Resource Type	Article
Subject	Chemistry Medicine Materials Science Biomedical Engineering

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