氧化纳米颗粒通过 Zn 调解了 Mueller-Hinton 中的细菌毒性
Alexander J Caron1, Iman J Ali1, Michael J Delgado1
1Department of Biology, Texas Christian University, Fort Worth, TX, United States.
Frontiers in microbiology
|May 7, 2024
概括
氧化纳米颗粒显示出作为抗菌剂的前景. 研究表明,可溶性离子 (Zn2+),而不是活性氧物种或物理损伤,是它们抗菌作用的主要原因.
科学领域:
- 纳米技术 纳米技术
- 微生物学 微生物学
- 材料科学 材料科学 材料科学
背景情况:
- 抗生素耐药性需要新的抗菌剂.
- 金属氧化物纳米颗粒,特别是氧化物纳米颗粒 (ZnO NPs),正在探索它们的抗菌潜力.
- 尚不清楚ZnO NPs的精确抗菌机制.
研究的目的:
- 为了阐明ZnO NPs对*S. aureus*的抗菌机制.
- 调查反应性氧物种,物理损伤和 Zn2+ 离子在 ZnO NP 毒性的作用.
- 评估颗粒大小和介质成分对ZnO NP疗效的影响.
主要方法:
- 评估 *S. aureus* 突变菌株 (Δ*katA*, Δ*mprF*) 对 ZnO NPs 的敏感性.
- 测量Zn2+离子积累和化在穆勒-欣顿.
- 使用半透膜对物理分离的 ZnO NPs 和细菌细胞进行生长抑制试验.
主要成果:
- 过氧化和静电相互作用对于 ZnO NP 毒性并不重要.
- 2+离子积聚在穆勒-欣顿中,它们的去除可以逆转毒性.
- 即使ZnONP和细菌细胞被半透膜分离,也会发生生长抑制.
结论:
- 可溶性 Zn2+ 离子是 Mueller-Hinton 中 ZnO NP 毒性的主要媒介.
- 未来的研究应该专注于粒子形态学和媒介对Zn2+溶解的影响,以优化NP设计.
- 了解这些因素可以导致具有增强抗菌性能的ZnONP的发展.
相关概念视频
EDTA: Auxiliary Complexing Reagents
1.6K
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
1.6K
Gene Regulation in Microbial Communities: Quorum Sensing
954
Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
954
Microbial Corrosion
93
Microbiologically Influenced Corrosion (MIC) is a significant form of material degradation caused by the metabolic activities of microorganisms. This phenomenon poses substantial challenges across various industries, including oil and gas, maritime, and water treatment sectors.MIC occurs when microorganisms, such as bacteria, archaea, and fungi, colonize metal surfaces, forming biofilms that alter the local electrochemical environment. These biofilms can lead to the production of corrosive...
93


