Evidence of cell surface iron speciation of acidophilic iron-oxidizing microorganisms in indirect bioleaching process

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• 作者：Zhen-yuan Nie ; Hong-chang Liu ; Jin-lan Xia ; Yi Yang ; Xiang-jun Zhen…
• 关键词：Synchrotron radiation ; Iron ; oxidizing microorganism ; Iron speciation ; In situ ; Bioleaching
• 刊名：Biometals
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：29
• 期：1
• 页码：25-37
• 全文大小：1,706 KB
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• 作者单位：Zhen-yuan Nie (1) (2)
  Hong-chang Liu (1) (2)
  Jin-lan Xia (1) (2)
  Yi Yang (1) (2)
  Xiang-jun Zhen (3) (4)
  Li-juan Zhang (3) (4)
  Guan-zhou Qiu (1) (2)
  
  1. School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China
  2. Key Lab of Biometallurgy of Ministry of Education of China, Central South University, Changsha, 410083, China
  3. Shanghai Synchrotron Radiation Facility, Shanghai, 201800, China
  4. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Biochemistry
  Physical Chemistry
  
• 出版者：Springer Netherlands
• ISSN：1572-8773

文摘

While indirect model has been widely accepted in bioleaching, but the evidence of cell surface iron speciation has not been reported. In the present work the iron speciation on the cell surfaces of four typically acidophilic iron-oxidizing microorganism (mesophilic Acidithiobacillus ferrooxidans ATCC 23270, moderately thermophilic Leptospirillum ferriphilum YSK and Sulfobacillus thermosulfidooxidans St, and extremely thermophilic Acidianus manzaensis YN25) grown on different energy substrates (chalcopyrite, pyrite, ferrous sulfate and elemental sulfur (S0)) were studied in situ firstly by using synchrotron-based micro- X-ray fluorescence analysis and X-ray absorption near-edge structure spectroscopy. Results showed that the cells grown on iron-containing substrates had apparently higher surface iron content than the cells grown on S0. Both ferrous iron and ferric iron were detected on the cell surface of all tested AIOMs, and the Fe(II)/Fe(III) ratios of the same microorganism were affected by different energy substrates. The iron distribution and bonding state of single cell of A. manzaensis were then studied in situ by scanning transmission soft X-ray microscopy based on dual-energy contrast analysis and stack analysis. Results showed that the iron species distributed evenly on the cell surface and bonded with amino, carboxyl and hydroxyl groups. Keywords Synchrotron radiation Iron-oxidizing microorganism Iron speciation In situ Bioleaching