Relationship among the secretion of extracellular polymeric substances, heat resistance, and bioleaching ability of Metallosphaera sedula
来源期刊：International Journal of Minerals Metallurgy and Materials2019年第12期
论文作者：Run-lan Yu Zhen-hua Liu Zhao-jing Yu Xue-ling Wu Li Shen Yuan-dong Liu Jiao-kun Li Wen-qing Qin Guan-zhou Qiu Wei-min Zeng
文章页码：1504 - 1511
摘 要：This paper describes the investigation of the secretion of extracellular polymeric substances(EPS) by an extremely thermoacidophilic archaea, Metallosphaera sedula(M. sedula), during the bioleaching of pyrite under different temperatures and discusses the relationship among the EPS secretion, its heat resistance, and its ability to bioleach pyrite. The investigation results indicate that the amount of extracellular proteins is significantly higher than the amount of extracellular polysaccharides in the extracted EPS whether free cells or attached cells; these results are quite different from the behavior of mesophilic Acidithiobacillus ferrooxidans. Although the growth of M. sedula is inhibited at 80℃, the bioleaching ability of M. sedula is only slightly lower than that at the optimum growth temperature of 72℃ because of the heat resistance mechanism based on EPS secretion. The secretion of more extracellular proteins is an important heat resistance mechanism of M. sedula.
Run-lan Yu1,2，Zhen-hua Liu1，Zhao-jing Yu1，Xue-ling Wu1,2，Li Shen1,2，Yuan-dong Liu1,2，Jiao-kun Li1,2，Wen-qing Qin1,2，Guan-zhou Qiu1,2，Wei-min Zeng1,2
1. School of Minerals Processing and Bioengineering, Central South University2. Key Laboratory of Biometallurgy of Ministry of Education, Central South University
摘 要：This paper describes the investigation of the secretion of extracellular polymeric substances(EPS) by an extremely thermoacidophilic archaea, Metallosphaera sedula(M. sedula), during the bioleaching of pyrite under different temperatures and discusses the relationship among the EPS secretion, its heat resistance, and its ability to bioleach pyrite. The investigation results indicate that the amount of extracellular proteins is significantly higher than the amount of extracellular polysaccharides in the extracted EPS whether free cells or attached cells; these results are quite different from the behavior of mesophilic Acidithiobacillus ferrooxidans. Although the growth of M. sedula is inhibited at 80℃, the bioleaching ability of M. sedula is only slightly lower than that at the optimum growth temperature of 72℃ because of the heat resistance mechanism based on EPS secretion. The secretion of more extracellular proteins is an important heat resistance mechanism of M. sedula.
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