Extracellular polymeric substances (EPS) secreted by: Purpureocillium lilacinum strain Y3 promote biosynthesis of jarosite

Bao, P, Xia, M, Liu, A, Wang, M, Shen, L, Yu, R, Liu, Y, Li, J, Wu, X, Fang, C, Chen, M, Qiu, G and Zeng, W 2018, 'Extracellular polymeric substances (EPS) secreted by: Purpureocillium lilacinum strain Y3 promote biosynthesis of jarosite', RSC Advances, vol. 8, no. 40, pp. 22635-22642.


Document type: Journal Article
Collection: Journal Articles

Title Extracellular polymeric substances (EPS) secreted by: Purpureocillium lilacinum strain Y3 promote biosynthesis of jarosite
Author(s) Bao, P
Xia, M
Liu, A
Wang, M
Shen, L
Yu, R
Liu, Y
Li, J
Wu, X
Fang, C
Chen, M
Qiu, G
Zeng, W
Year 2018
Journal name RSC Advances
Volume number 8
Issue number 40
Start page 22635
End page 22642
Total pages 8
Publisher Royal Society of Chemistry
Abstract In this study, the biosynthesis of jarosite by Purpureocillium lilacinum was investigated. Firstly, we found when the pH value was lower than 2.50 at 30 °C, the concentration of Fe3+ in the solution significantly dropped about 72% after inoculation and a yellow-ocher precipitate was observed on the mycelium surface. X-ray diffraction analysis revealed the precipitate was jarosite. Thereafter, the characterization of the biomineralization process by scanning electron microscopy showed that mineral precipitates started on the cell surface, and then thoroughly covered it. Furthermore the effect of extracellular polymeric substances (EPS) on the biosynthesis of jarosite was investigated. The results suggested Fe3+ only dropped 5.2% in 2 days when EPS were stripped. Finally, through monitoring the changes of mycelium surface groups by Fourier transform infrared spectroscopy, we found the biomineralization process originated from the existence of free PO groups in EPS which acted as crystallization nuclei to promote Fe(OH)3 transformation into jarosite by the formation of P-O-Fe bonds.
Subject Chemical Sciences not elsewhere classified
Keyword(s) Bacterial Exopolymers
Mine Drainage
Rio Tinto
Biomineralization
Goethite
Acid
Mineralization
Surface
Iron
Exopolysaccharide
DOI - identifier 10.1039/c8ra03060j
Copyright notice © The Royal Society of Chemistry 2018.Creative Commons Attribution-NonCommercial 3.0 Unported Licence.
ISSN 2046-2069
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