Constraints on superoxide mediated formation of manganese oxides

Learman, Deric R.; Voelker, Bettina M.; Madden, Andrew S.; Hansel, Colleen M.

doi:10.3389/fmicb.2013.00262

Constraints on superoxide mediated formation of manganese oxides

Journal Article · Tue Sep 03 00:00:00 EDT 2013 · Frontiers in Microbiology

DOI:https://doi.org/10.3389/fmicb.2013.00262· OSTI ID:1628096

Learman, Deric R. ^[1]; Voelker, Bettina M. ^[2]; Madden, Andrew S. ^[3]; Hansel, Colleen M. ^[4]

Central Michigan Univ., Mount Pleasant, MI (United States). Institute for Great Lakes Research and Department of Earth and Atmospheric Sciences; DOE/OSTI
Colorado School of Mines, Golden, CO (United States). Dept. of Chemistry and Geochemistry
Univ. of Oklahoma, Norman, OK (United States). School of Geology and Geophysics
Woods Hole Oceanographic Institution, Woods Hole, MA (United States). Marine Chemistry and Geochemistry Dept.

Manganese (Mn) oxides are among the most reactive sorbents and oxidants within the environment, where they play a central role in the cycling of nutrients, metals, and carbon. Recent discoveries have identified superoxide (O$$^–_2$$) both of biogenic and abiogenic origin as an effective oxidant of Mn(II) leading to the formation of Mn oxides. Here we examined the conditions under which abiotically produced superoxide led to oxidative precipitation of Mn and the solid-phases produced. Oxidized Mn, as both aqueous Mn(III) and Mn(III/IV) oxides, was only observed in the presence of active catalase, indicating that hydrogen peroxide (H₂O₂), a product of the reaction of O$$^–_2$$ with Mn(II), inhibits the oxidation process presumably through the reduction of Mn(III). Citrate and pyrophosphate increased the yield of oxidized Mn but decreased the amount of Mn oxide produced via formation of Mn(III)- ligand complexes. While complexing ligands played a role in stabilizing Mn(III), they did not eliminate the inhibition of net Mn(III) formation by H₂O₂. The Mn oxides precipitated were highly disordered colloidal hexagonal birnessite, similar to those produced by biotically generated superoxide.Yet, in contrast to the large particulate Mn oxides formed by biogenic superoxide, abiotic Mn oxides did not ripen to larger, more crystalline phases.This suggests that the deposition of crystalline Mn oxides within the environment requires a biological, or at least organic, influence.This work provides the first direct evidence that, under conditions relevant to natural waters, oxidation of Mn(II) by superoxide can occur and lead to formation of Mn oxides. For organisms that oxidize Mn(II) by producing superoxide, these findings may also point to other microbially mediated processes, in particular enzymatic hydrogen peroxide degradation and/or production of organic ligand metabolites, that allow for Mn oxide formation.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)

Sponsoring Organization:: National Center for Research Resources (NCRR); National Institutes of Health (NIH); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER)

OSTI ID:: 1628096

Journal Information:: Frontiers in Microbiology, Journal Name: Frontiers in Microbiology Vol. 4; ISSN 1664-302X

Publisher:: Frontiers Research FoundationCopyright Statement

Country of Publication:: United States

Language:: English

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59 BASIC BIOLOGICAL SCIENCES
Mn(III) complexes
manganese oxidation
manganese oxides
microbiology
organic ligands
reactive oxygen species
superoxide

Constraints on superoxide mediated formation of manganese oxides

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