期刊
FRONTIERS IN MICROBIOLOGY
卷 13, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fmicb.2022.1020179
关键词
Mortierella; Te(IV) reduction; Bio-TeNPs; antibacterial; cytotoxicity
类别
资金
- National Natural Science Foundation of China [32000066]
- China Scholarship Council Scholarships
- Hubei Province Key R&D Program Project [2021BCA148]
- Innovation team Project of Hubei Education Department [T2022010]
- Innovation Team Project of Hubei Normal University at Hubei Normal University [T201907]
- Open Foundation of the Hubei Key Laboratory of Edible Wild Plants Conservation and Utilization [EWPL202209]
In this study, a fungus with high resistance to toxic tellurite [Te(IV)] was isolated. The fungus efficiently reduced Te(IV) to less toxic Te(0), forming rod-shaped biogenic nanoparticles (Bio-TeNPs) intracellularly. The extracted Bio-TeNPs consisted of Te(0), proteins, lipids, aromatic compounds, and carbohydrates, and exhibited excellent antibacterial ability against various bacteria. Moreover, the Bio-TeNPs showed excellent antioxidant capacity and no cytotoxicity. These findings suggest the potential of strain AB1 in bioremediation and the Bio-TeNPs as antibacterial nanomaterials.
Tellurite [Te(IV)] is a high-toxicity metalloid. In this study, a fungus with high Te(IV) resistance was isolated. Strain AB1 could efficiently reduce highly toxic Te(IV) to less toxic Te(0). The reduced products formed rod-shaped biogenetic Te(0) nanoparticles (Bio-TeNPs) intracellularly. Further TEM-element mapping, FTIR, and XPS analysis showed that the extracted Bio-TeNPs ranged from 100 to 500 nm and consisted of Te(0), proteins, lipids, aromatic compounds, and carbohydrates. Moreover, Bio-TeNPs exhibited excellent antibacterial ability against Shigella dysenteriae, Escherichia coli, Enterobacter sakazakii, and Salmonella typhimurium according to inhibition zone tests. Further growth and live/dead staining experiments showed that E. coli and S. typhimurium were significantly inhibited by Bio-TeNPs, and cells were broken or shriveled after treatment with Bio-TeNPs based on SEM observation. Additionally, the antioxidant and cytotoxicity tests showed that the Bio-TeNPs exhibited excellent antioxidant capacity with no cytotoxicity. All these results suggested that strain AB1 showed great potential in bioremediation and Bio-TeNPs were excellent antibacterial nanomaterials with no cytotoxicity.
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