Department of Basic Medical Sciences, Faculty of Medicine, Galala University, Galala City, 43511, Suez, Egypt.
Chemical Engineering Department, Military Technical College (MTC), Egyptian Armed Forces, Cairo, Egypt.
Sci Rep. 2023 Apr 1;13(1):5353. doi: 10.1038/s41598-023-32323-y.
In this study, CoFeO nanoparticles were prepared by the co-precipitation method then surface modified with Capsaicin (Capsicum annuum ssp.). The virgin CoFeO NPs and Capsaicin-coated CoFeO NPs (CPCF NPs) were characterized by XRD, FTIR, SEM, and TEM. The antimicrobial potential and photocatalytic degradation efficiencies of the prepared samples via Fuchsine basic (FB) were investigated. The results revealed that CoFeO NPs have spherical shapes and their diameter varied from 18.0 to 30.0 nm with an average particle size of 25.0 nm. Antimicrobial activity was tested on Gram-positive (S. aureusATCC 52923) and Gram-negative (E. coli ATCC 52922) by disk diffusion and broth dilution methods to determine the zone of inhibition (ZOI) and minimum inhibitory concentration (MIC), respectively. UV-assisted photocatalytic degradation of FB was examined. Various parameters affecting the photocatalytic efficiency such as pH, initial concentration of FB, and dose of nanocatalyst were studied. The in-vitro ZOI and MIC results verified that CPCF NPs were more active upon Gram-Positive S. aureus ATCC 52923 (23.0 mm ZOI and 0.625 μg/ml MIC) than Gram-Negative E. coli ATCC 52922 (17.0 mm ZOI and 1.250 μg/ml MIC). Results obtained from the photocatalytic activity indicated that the maximum FB removal achieving 94.6% in equilibrium was observed using 20.0 mg of CPCF NPS at pH 9.0. The synthesized CPCF NPs were effective in the removal of FB and also as potent antimicrobial agent against both Gram-positive and Gram-negative bacteria with potential medical and environmental applications.
在这项研究中，采用共沉淀法制备了 CoFeO 纳米粒子，然后用辣椒素（Capsicum annuum ssp.）进行表面修饰。对原始 CoFeO NPs 和辣椒素包覆的 CoFeO NPs（CPCF NPs）进行了 XRD、FTIR、SEM 和 TEM 表征。通过碱性藏红（FB）研究了所制备样品的抗菌潜力和光催化降解效率。结果表明，CoFeO NPs 具有球形形状，其直径在 18.0 到 30.0nm 之间，平均粒径为 25.0nm。通过圆盘扩散和肉汤稀释法对革兰氏阳性（S. aureus ATCC 52923）和革兰氏阴性（E. coli ATCC 52922）进行了抗菌活性测试，以分别确定抑菌圈（ZOI）和最小抑菌浓度（MIC）。考察了 FB 的紫外辅助光催化降解。研究了影响光催化效率的各种参数，如 pH、FB 的初始浓度和纳米催化剂的剂量。体外 ZOI 和 MIC 结果证实，CPCF NPs 对革兰氏阳性 S. aureus ATCC 52923 的活性更强（23.0mm ZOI 和 0.625μg/ml MIC），而对革兰氏阴性 E. coli ATCC 52922 的活性较弱（17.0mm ZOI 和 1.250μg/ml MIC）。光催化活性的结果表明，在 pH 9.0 下，使用 20.0mg 的 CPCF NPS 可达到 94.6%的最大 FB 去除率，达到平衡。合成的 CPCF NPs 可有效去除 FB，并且对革兰氏阳性和革兰氏阴性细菌均具有很强的抗菌作用，具有潜在的医疗和环境应用价值。
