Mechanisms of carbonate precipitation induced by two model bacteria

球霰石 碳酸钙 碳酸盐 方解石 矿化(土壤科学) 细菌 枯草芽孢杆菌 化学 细菌细胞结构 生物矿化 碳酸酐酶 生物化学 生物物理学 地质学 矿物学 生物 文石 有机化学 古生物学 氮气
作者
Xiaofang Li,Xiaodan He,Kaiyan Ren,Yue‐Qin Tang,Bin Lian
出处
期刊:Chemical Geology [Elsevier BV]
卷期号:628: 121461-121461 被引量:5
标识
DOI:10.1016/j.chemgeo.2023.121461
摘要

The investigation of microbially induced calcium carbonate precipitation is essential to understanding CO2 fixation, marine carbonate rock formation, and biogeochemical cycling of life-essential elements. In this study, two model bacteria Bacillus subtilis (possess the cell wall of G+ bacteria) and Escherichia coli (possess the cell wall of G− bacteria) were used as representatives to induce carbonate mineralization. The mineralization ability of the two bacteria and carbonate precipitation mechanisms were studied with the biochemical analysis of bacterial fermentation products, mineral characterization, and biomimetic mineralization experiments. The results showed that both bacteria induced biomineral formation by using the cell wall as a template, but B. subtilis was more capable of inducing mineralization than E. coli. Particularly, the percentage of Ca2+ removal from the culture medium by the former reached 36% in 7 days, which induced the formation of vaterite and calcite, while that of Ca2+ removal by the latter reached 28%, and the resulting carbonate was amorphous calcium carbonate. Biomimetic mineralization experiments showed that protein molecules were the key factors inducing the formation of biological vaterite, while polysaccharides tended to bind small vaterite particles to form large organo-mineral aggregates. By comparing the results of inducing calcium carbonate under the same culture conditions, the two types of bacteria with completely different cell wall structures had significant differences in the ability to induce calcium carbonate synthesis, among which that was stronger by Bacillus subtilis (G+) than by Escherichia coli (G−). It was found that factors such as bacterial cell wall structure, extracellular secretions including carbonic anhydrase, pH value, etc. all affect the microbial-induced carbonate precipitation to varying degrees, providing new insights into the theory of bacterial-induced carbonate mineralization.
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