Materials Science Lab, Radiation Physics Department, National Center for Radiation Research and Technology (NCRRT), Atomic Energy Authority, Cairo, Egypt.
Drug Microbiology Lab, Drug Radiation Research Department, National Center for Radiation Research and Technology (NCRRT), Atomic Energy Authority, Cairo, Egypt.
Microb Pathog. 2019 Feb;127:144-158. doi: 10.1016/j.micpath.2018.11.045. Epub 2018 Nov 28.
This study reports the photocatalytic degradation of Methylene Blue (MB) dye (a class of dyestuffs that are resistant to biodegradation) under the influence of UV-light irradiation. Antibacterial and antibiofilm activities of ferrite nanoparticles (FO NPs) were examined against some pathogenic bacteria isolated from the medical operating room surfaces. In the same context, metals-substituted spinel cobalt ferrite nanoparticles with nominal composition [MCoFeO NPs; (M = Zn, Cu, Mn; x = 0.0, 0.25, 0.5 and 0.75)] were synthesized by citrate sol-gel method. Also, the structures of the synthesized FO NPs were characterized by X-ray diffraction, and Williamson-Hall (WH) method was used to determine the crystallite size. The estimated specific surface area is found in the range from 37.99 to 107.05 m/g, between the synthesized ferrites, ZnCoFeO NPs have average pore radius 1.84 nm and the pore volume was 0.136 ml/g. SEM images revealed that, the synthesized FO NPs have an unique pores and uniformly distribution, while EDX spectra shows the elemental composition for the synthesized FO NPs. The elastic properties of FO NPs have been estimated using FTIR data, whereas (M - H) hysteresis loops revealed that, by replacing cobalt ions with Zn, Cu, and Mn ions the magnetic behaviour changed from ferromagnetic to paramagnetic. Results obtained from the photocatalysis indicated that MnCoFeO NPs (30.0 mg) were a promising photocatalyst achieving 96.0% removal of MB after 100 min of UV-light exposure in the alkaline solution. Antibacterial results showed that the most effective combination was ZnCoFeO NPs (20.0 ppm) displaying activity against Staphylococcus aureus, Enterococcus columbae, and Aerococcus viridians by 15.0, 13.0, and 12.0 mm ZOI, respectively. Additionally, ZnCoFeO NPs were active as antibiofilm factors producing activity by 63.7, 57.9, and 45.5% towards S. aureus, A. viridians, and E. columbae, respectively. Accordingly, ZnCoFeO and MnCoFeO NPs can be utilized in industrial, biological and medical applications.
本研究报告了在紫外光照射下，亚甲基蓝（MB）染料（一类不易生物降解的染料）的光催化降解。研究了尖晶石铁氧体纳米粒子（FO NPs）对从医疗手术室表面分离出的一些致病菌的抗菌和抗生物膜活性。在相同的背景下，通过柠檬酸溶胶-凝胶法合成了具有标称组成[MCoFeO NPs;（M=Zn、Cu、Mn；x=0.0、0.25、0.5 和 0.75]的金属取代尖晶石钴铁氧体纳米粒子。此外，通过 X 射线衍射对合成的 FO NPs 的结构进行了表征，并使用 Williamson-Hall（WH）方法确定了晶粒尺寸。估计的比表面积在合成铁氧体之间的范围为 37.99 至 107.05 m/g，ZnCoFeO NPs 的平均孔径为 1.84nm，孔体积为 0.136ml/g。SEM 图像显示，合成的 FO NPs 具有独特的孔和均匀的分布，而 EDX 光谱显示了合成的 FO NPs 的元素组成。通过 FTIR 数据估计了 FO NPs 的弹性特性，而（M-H）磁滞回线表明，用 Zn、Cu 和 Mn 离子取代钴离子会使磁性从铁磁性变为顺磁性。光催化实验结果表明，MnCoFeO NPs（30.0mg）在碱性溶液中经 100min 紫外光照射后，对 MB 的去除率达到 96.0%，是一种很有前途的光催化剂。抗菌结果表明，最有效的组合是 ZnCoFeO NPs（20.0ppm），对金黄色葡萄球菌、鸽子肠球菌和鸟粪球菌的抑菌圈直径分别为 15.0、13.0 和 12.0mm。此外，ZnCoFeO NPs 作为抗生物膜因子具有活性，对金黄色葡萄球菌、A. viridians 和 E. columbae 的抑制率分别为 63.7%、57.9%和 45.5%。因此，ZnCoFeO 和 MnCoFeO NPs 可用于工业、生物和医疗应用。
Mater Sci Eng C Mater Biol Appl. 2018-5-15
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