Bioleaching of Manganese Oxides at Different Oxidation States by Filamentous Fungus Aspergillus niger

Journal of Fungi

Hyunjung Kim¹  Martin Cesnek²  Ondřej Zvěřina³  Filip Polák⁴  Martin Urík⁵  Bence Farkas⁵  Peter Matúš⁵  Eva Duborská⁵  Marek Bujdoš⁵  Michaela Matulová⁵  Zuzana Kisová⁶  Martin Danko⁷ 

[1] Department of Mineral Resources and Energy Engineering, Jeonbuk National University, Jeonju-si 54896, Korea;Department of Nuclear Reactors, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, V Holešovičkách 2, 18000 Prague, Czech Republic;Department of Public Health, Faculty of Medicine, Masaryk University, Kamenice 753/5, 62500 Brno, Czech Republic;Department of Soil Science and Soil Protection, Czech University of Life Sciences Prague, Kamýcká 129, 16500 Praha-Suchdol, Czech Republic;Institute of Laboratory Research on Geomaterials, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská Dolina, Ilkovičova 6, 842 15 Bratislava, Slovakia;Institute of Molecular Biology, Slovak Academy of Sciences, Dúbravská Cesta 21, 845 51 Bratislava, Slovakia;Polymer Institute, Slovak Academy of Sciences, Dúbravská Cesta 9, 845 41 Bratislava, Slovakia;

关键词: bioextraction;    bioleaching;    filamentous fungi;    manganese oxide;    oxalate;   

DOI  :  10.3390/jof7100808

来源: DOAJ

【 摘 要 】

This work aimed to examine the bioleaching of manganese oxides at various oxidation states (MnO, MnO·Mn₂O₃, Mn₂O₃ and MnO₂) by a strain of the filamentous fungus Aspergillus niger, a frequent soil representative. Our results showed that the fungus effectively disintegrated the crystal structure of selected mineral manganese phases. Thereby, during a 31-day static incubation of oxides in the presence of fungus, manganese was bioextracted into the culture medium and, in some cases, transformed into a new biogenic mineral. The latter resulted from the precipitation of extracted manganese with biogenic oxalate. The Mn(II,III)-oxide was the most susceptible to fungal biodeterioration, and up to 26% of the manganese content in oxide was extracted by the fungus into the medium. The detected variabilities in biogenic oxalate and gluconate accumulation in the medium are also discussed regarding the fungal sensitivity to manganese. These suggest an alternative pathway of manganese oxides’ biodeterioration via a reductive dissolution. There, the oxalate metabolites are consumed as the reductive agents. Our results highlight the significance of fungal activity in manganese mobilization and transformation. The soil fungi should be considered an important geoactive agent that affects the stability of natural geochemical barriers.

【 授权许可】

Unknown