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

Archibald, Stephen J.; Young, Nigel A.; Atkin, Stephen L.; Bras, Wim; Diego-Taboada, Alberto; Mackenzie, Grahame; Mosselmans, J. Frederick W.; Nikitenko, Sergey; Quinn, Paul D.; Thomas, Michael F.

Authors

Stephen L. Atkin

Wim Bras

Alberto Diego-Taboada

Grahame Mackenzie

J. Frederick W. Mosselmans

Sergey Nikitenko

Paul D. Quinn

Michael F. Thomas

Dr Nigel Young N.A.Young@hull.ac.uk
Senior Lecturer/ Director of Studies/ Deputy Head of Chemistry and Biochemistry/ Industrial Placements Coordinator

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.

Publication Date Feb 28, 2014
Journal Journal of materials chemistry. B
Print ISSN 2050-750X
Electronic ISSN 2050-7518
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 2
Issue 8
Pages 945-959
Institution Citation Archibald, S. J., Atkin, S. L., Bras, W., Diego-Taboada, A., Mackenzie, G., Mosselmans, J. F. W., …Young, N. A. (2014). How does iron interact with sporopollenin exine capsules? An X-ray absorption study including microfocus XANES and XRF imaging. Journal of materials chemistry B, Materials for biology and medicine /, 2(8), 945-959. https://doi.org/10.1039/c3tb21523g
DOI https://doi.org/10.1039/c3tb21523g
Keywords Sporopollenin exine capsules, Iron, X-ray absorption, XANES, XRF
Publisher URL http://pubs.rsc.org/en/content/articlelanding/2014/tb/c3tb21523g#!divAbstract
Copyright Statement ©2015 University of Hull
Additional Information Authors' accepted manuscript of article of article published in: Journal of materials chemistry. B, 2014, issue 8

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