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Enhanced Antibacterial Activity Of Nanocrystalline Zno Due To Increased Ros-mediated Cell Injury

机译:Ros介导的细胞损伤增加导致纳米晶Zno增强抗菌活性

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摘要

An innovative study aimed at understanding the influence of the particle size of ZnO (from the microscale down to the nanoscate) on its antibacterial effect is reported herein. The antibacterial activity of ZnO has been found to be due to a reaction of the ZnO surface with water. Electron-spin resonance measurements reveal that aqueous suspensions of small nanoparticles of ZnO produce increased levels of reactive oxygen species, namely hydroxyl radicals. Interestingly, a remarkable enhancement of the oxidative stress, beyond the level yielded by the ZnO itself, is detected following the antibacterial treatment. Likewise, an exposure of bacteria to the small ZnO nanopartides results in an increased cellular internalization of the nanopartides and bacterial cell damage. An examination of the antibacterial effect is performed on two bacterial species: Escherichia coli (Gram negative) and Staphylococcus aureus (Gram positive). The nanocrystalline particles of ZnO are synthesized using ultrasonic irradiation, and the particle sizes are controlled using different solvents during the sonication process. Taken as a whole, it is apparent that the unique properties (i.e., small size and corresponding large specific surface area) of small nanometer-scale ZnO particles impose several effects that govern its antibacterial action. These effects are size dependent and do not exist in the range of microscale particles.
机译:本文报道了一项创新研究,旨在了解ZnO粒度(从微米级到纳米级)对其抗菌效果的影响。已经发现ZnO的抗菌活性是由于ZnO表面与水的反应。电子自旋共振测量结果表明,ZnO小纳米颗粒的水悬浮液会增加活性氧的含量,即羟基自由基。有趣的是,经过抗菌处理后,发现氧化应激显着增强,超过了ZnO本身产生的水平。同样,细菌暴露于小的ZnO纳米颗粒会导致纳米颗粒的细胞内在化增加和细菌细胞受损。对两种细菌进行了抗菌效果检查:大肠杆菌(革兰氏阴性)和金黄色葡萄球菌(革兰氏阳性)。 ZnO的纳米晶体颗粒是通过超声辐射合成的,在超声处理过程中,使用不同的溶剂控制粒径。总的来说,很明显,小纳米级ZnO颗粒的独特性质(即,小尺寸和相应的大比表面积)具有控制其抗菌作用的几种作用。这些影响取决于尺寸,并且不存在于微米级颗粒范围内。

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