Antibacterial Potential of Ag–Au Alloy Nanoparticles Combined with Femtosecond Laser Light Against Drug-Resistant Eye Pathogens | ||||
| Egyptian Journal of Chemistry | ||||
| Articles in Press, Accepted Manuscript, Available Online from 06 July 2025 | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejchem.2025.374399.11575 | ||||
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| Authors | ||||
Ahmed El-Gendy 1; Talal A Hussein2; Esraa Ahmed2; Ola Dabbous3; Tarek A Mohamed  2
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| 1Faculty of Pharmacy, Beni-Suef University, Egypt | ||||
| 2Beni-Suef University, Beni-Suef 62511, Egypt | ||||
| 3Cairo University | ||||
| Abstract | ||||
| The synthesis of bimetallic nanoparticles (BNPs) has garnered significant interest due to their superior physicochemical and biological properties compared to monometallic nanoparticles (MNPs). In this study, Ag/Au alloy nanoparticles were synthesized via pulsed laser ablation in liquid (PLAL) and characterized for their optical, morphological, and antibacterial properties. The formation of Ag/Au alloy nanoparticles was characterized through UV-Vis spectroscopy, transmission electron microscopy (TEM), and inductively coupled plasma (ICP) analysis. The antibacterial efficacy of the synthesized nanoparticles was evaluated against Methicillin-Resistant Staphylococcus aureus (MRSA) in vitro. Additionally, a femtosecond laser at 400 nm wavelength was employed to assess the synergistic effects of laser irradiation and Ag/Au alloy nanoparticles on bacterial viability. Growth kinetics analysis revealed that femtosecond laser treatment alone significantly reduced bacterial proliferation (P < 0.0001), whereas Ag/Au alloy nanoparticles required higher concentrations to exhibit noticeable antibacterial effects. The combination of both approaches resulted in the most pronounced bacterial growth inhibition. This study unlocked a new perception of synthesizing Ag/Au alloy nanoparticles via the laser ablation technique and their potential application in treating various ocular infections particularly when used in conjunction with femtosecond laser-based antimicrobial photodynamic therapy. To our knowledge, this is the first study to report the combined use of femtosecond laser irradiation and PLAL-synthesized Ag/Au alloy NPs for antimicrobial photodynamic therapy, offering a novel approach to combating drug-resistant eye pathogens. Further studies are needed to optimize the synthesis parameters and evaluate the biocompatibility of these nanoparticles for future clinical applications. | ||||
| Keywords | ||||
| Eye infection; antibacterial; Ag/Au alloy nanoparticles; photodynamic therapy; Gram-positive bacteria; Femtosecond laser; Quantum dots | ||||
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