Fabrication of Gelatin-ZnO Nanofibers for Antibacterial Applications

材料科学 明胶 扫描电子显微镜 纳米纤维 抗菌活性 静电纺丝 纳米颗粒 傅里叶变换红外光谱 化学工程 纳米复合材料 光致发光 核化学 复合材料 纳米技术 化学 有机化学 聚合物 细菌 光电子学 生物 工程类 遗传学
作者
Nataliya Babayevska,Łucja Przysiecka,Grzegorz Nowaczyk,Marcin Jarek,Martin Järvekülg,Triin Kangur,Ewa Janiszewska,Stefan Jurga,Igor Iatsunskyi
出处
期刊:Materials [MDPI AG]
卷期号:14 (1): 103-103 被引量:28
标识
DOI:10.3390/ma14010103
摘要

In this study, GNF@ZnO composites (gelatin nanofibers (GNF) with zinc oxide (ZnO) nanoparticles (NPs)) as a novel antibacterial agent were obtained using a wet chemistry approach. The physicochemical characterization of ZnO nanoparticles (NPs) and GNF@ZnO composites, as well as the evaluation of their antibacterial activity toward Gram-positive (Staphyloccocus aureus and Bacillus pumilus) and Gram-negative (Escherichia coli and Pseudomonas fluorescens) bacteria were performed. ZnO NPs were synthesized using a facile sol-gel approach. Gelatin nanofibers (GNF) were obtained by an electrospinning technique. GNF@ZnO composites were obtained by adding previously produced GNF into a Zn2+ methanol solution during ZnO NPs synthesis. Crystal structure, phase, and elemental compositions, morphology, as well as photoluminescent properties of pristine ZnO NPs, pristine GNF, and GNF@ZnO composites were characterized using powder X-ray diffraction (XRD), FTIR analysis, transmission and scanning electron microscopies (TEM/SEM), and photoluminescence spectroscopy. SEM, EDX, as well as FTIR analyses, confirmed the adsorption of ZnO NPs on the GNF surface. The pristine ZnO NPs were highly crystalline and monodispersed with a size of approximately 7 nm and had a high surface area (83 m2/g). The thickness of the pristine gelatin nanofiber was around 1 µm. The antibacterial properties of GNF@ZnO composites were investigated by a disk diffusion assay on agar plates. Results show that both pristine ZnO NPs and their GNF-based composites have the strongest antibacterial properties against Pseudomonas fluorescence and Staphylococcus aureus, with the zone of inhibition above 10 mm. Right behind them is Escherichia coli with slightly less inhibition of bacterial growth. These properties of GNF@ZnO composites suggest their suitability for a range of antimicrobial uses, such as in the food industry or in biomedical applications.
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