Elucidation of gram-positive bacterial iron(Iii) reduction for kaolinite clay refinement

Jing，Hao1; Liu，Zhao1; Kuan，Seng How2; Chieng，Sylvia3; Ho，Chun Loong1

2021-06-01

10.3390/molecules26113084

Molecules   影响因子和分区

1420-3049

Recently, microbial-based iron reduction has been considered as a viable alternative to typical chemical-based treatments. The iron reduction is an important process in kaolin refining, where iron-bearing impurities in kaolin clay affects the whiteness, refractory properties, and its commercial value. In recent years, Gram-negative bacteria has been in the center stage of iron reduction research, whereas little is known about the potential use of Gram-positive bacteria to refine kaolin clay. In this study, we investigated the ferric reducing capabilities of five microbes by manipulating the microbial growth conditions. Out of the five, we discovered that Bacillus cereus and Staphylococcus aureus outperformed the other microbes under nitrogen-rich media. Through the biochemical changes and the microbial behavior, we mapped the hypothetical pathway leading to the iron reduction cellular properties, and found that the iron reduction properties of these Gram-positive bacteria rely heavily on the media composition. The media composition results in increased basification of the media that is a prerequisite for the cellular reduction of ferric ions. Further, these changes impact the formation of biofilm, suggesting that the cellular interaction for the iron(III)oxide reduction is not solely reliant on the formation of biofilms. This article reveals the potential development of Gram-positive microbes in facilitating the microbial-based removal of metal contaminants from clays or ores. Further studies to elucidate the corresponding pathways would be crucial for the further development of the field.

Iron(III)oxide Kaolin Medium Reduction Secondary metabolites

SCI

英语

第一 ; 通讯

WOS:000660422400001

CHEMISTRY

2-s2.0-85107120252

Scopus

1.Department of Biomedical Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Department of Mechanical and Material Engineering,Universiti Tunku Abdul Rahman,43000,Malaysia
3.Department of Biological Sciences and Biotechnology,Universiti Kebangsaan Malaysia,43000,Malaysia

Jing，Hao,Liu，Zhao,Kuan，Seng How,et al. Elucidation of gram-positive bacterial iron(Iii) reduction for kaolinite clay refinement[J]. Molecules,2021,26(11).

Jing，Hao,Liu，Zhao,Kuan，Seng How,Chieng，Sylvia,&Ho，Chun Loong.(2021).Elucidation of gram-positive bacterial iron(Iii) reduction for kaolinite clay refinement.Molecules,26(11).

Jing，Hao,et al."Elucidation of gram-positive bacterial iron(Iii) reduction for kaolinite clay refinement".Molecules 26.11(2021).