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The Application of Antimicrobial Nano‐ZnO Nanocoatings as the Surface of Cell Culture Dish
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ZnO nanocoatings for antibiotic-free cell culture dishes with 98.3% bacterial kill rate and 60% plastic waste reduction
ABSTRACT Cell culture is an indispensable technique in biological research. However, cultured cells are vulnerable to microbial contamination, leading to unreliable and unrepeatable research data. Penicillin‐streptomycin, a common preventive measure, can significantly affect gene expression and regulation in cells. This study aims to develop a photocatalytic antimicrobial and biocompatible film for cell culture dish surfaces. Zinc oxide nanocoatings, synthesized by atomic layer deposition (ALD) on the surface of indium tin oxide (ITO) glass, exhibit strong, robust adhesion. We introduced an antibiotic‐free cell culture system utilizing ALD‐engineered ZnO nanocoatings. Scanning electron microscope (SEM), x‐ray diffraction (XRD), x‐ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM) reveal a smooth surface and simple composition of the ZnO film. The ZnO nanofilms exhibited potent antimicrobial activity, achieving a bacterial lethality rate of 98.3% under visible light ( λ = 336 nm) within 30 min. Remarkably, these coatings sustained biocompatibility over three successive cell passages, as evidenced by unaltered proliferation rates ( p > 0.05) and preserved cytoskeletal architecture in HeLa cells. Furthermore, ZnO nanocoatings retain their exceptional properties even after five successive generations of cell culture, leading to a 60% reduction in plastic waste compared to conventional Petri dishes. This study suggests that ZnO nanocoatings could be a promising solution to reduce contamination and antibiotic use on cell culture surfaces.
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Researchers biosynthesised zinc oxide nanoparticles using fungal supernatant grown in kitchen wastewater with microelectronic sludge (FKMW-ZnO NPs) and evaluated their photocatalytic efficiency for degrading low-density polyethylene (LDPE) in aqueous solution. Optimisation using response surface methodology and prediction modelling with a radial basis function neural network ensemble identified the key parameters governing LDPE degradation performance.
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LDPE microplastic residues were treated with zinc oxide nanorods under visible light irradiation, resulting in a 30% increase in carbonyl index and increased brittleness, demonstrating photocatalytic oxidation of the plastic surface. The study shows that ZnO nanorod photocatalysis can initiate microplastic degradation using visible light, offering a potential low-energy remediation approach.
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