ArticleMolecular biology reports2024
Green synthesis of silver nanoparticles using Acroptilon repens aqueous extract and their antibacterial efficacy against multidrug-resistant Acinetobacter baumannii.
Article in Molecular biology reports, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers, 1 of them a synthesis that pooled it.
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Who cites it
3 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Green-Synthesized Silver Nanoparticles Against Acinetobacter baumannii: A Systematic Review of Antibacterial Activity, Mechanisms of Action, Toxicity, and Antibiofilm Effects.MicrobiologyOpen · 2026Pooled it
- In vitro assessment of an antimicrobial peptide against Acinetobacter baumannii persister cells.Scientific reports · 2025Article
- Workflow and Practical Guidance for Identical Location Scanning Electron Microscopy: Reliable Tracking of Localized Transformations.Small methods · 2025Article
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Authors and funding
4 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundAcinetobacter baumannii is a critical pathogen associated with hospital-acquired infections, particularly in burn and intensive care unit (ICU) patients, and is notorious for its high level of antibiotic resistance. This study aims to evaluate the antibacterial potential of silver nanoparticles (AgNPs) synthesized using Acroptilon repens extract as a promising alternative treatment for combating multidrug-resistant A. baumannii. METHODS AND
resultsTwelve clinical isolates of A. baumannii were identified through biochemical testing. Antibiotic susceptibility testing using the Kirby-Bauer disk diffusion method revealed universal resistance to ceftazidime, amikacin, imipenem, gentamicin, ciprofloxacin, and piperacillin-tazobactam, while all isolates remained sensitive to colistin (p ≤ 0.05). AgNPs were synthesized using A. repens extract and characterized through transmission electron microscopy (TEM), scanning electron microscopy (SEM), particle size analysis (PSA), UV-Vis spectroscopy, X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FT-IR). TEM analysis showed that the AgNPs had a spherical morphology with an average particle size of approximately 30 nm, while SEM confirmed their spherical shape and size distribution, ranging from 10 to 130 nm, with a mean size of 38.89 nm. UV-Vis spectroscopy confirmed the successful formation of AgNPs, indicated by a distinct broad absorption peak between 400 and 480 nm. XRD analysis validated the crystalline nature of the nanoparticles, with characteristic peaks at 2θ values of 38.21°, 46.28°, 64.57°, and 77.49°, corresponding to the (111), (200), (220), and (311) planes of face-centered cubic (fcc) silver. Antibacterial activity was evaluated by determining the minimum inhibitory concentration (MIC), which ranged from 50 to 400 µg/mL. The highest inhibitory activity was observed at 400 µg/mL. Gene expression analysis using quantitative real-time PCR (qRT-PCR) demonstrated downregulation of the oprD and carO porin genes following AgNP treatment. However, these reductions were not statistically significant (p = 0.302 and p = 0.198, respectively).
conclusionsAgNPs synthesized from A. repens demonstrated strong antibacterial activity against multidrug-resistant A. baumannii. While downregulation of porin genes was observed, further investigation is required to elucidate the underlying mechanisms of action and assess their potential clinical applications. These findings support the potential of AgNPs as an alternative therapeutic strategy for addressing A. baumannii infections resistant to conventional antibiotics.
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