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Evaluation of Antimicrobial Activities of Nanoparticles and Nanostructured Surfaces In Vitro
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Gold Nanoparticles Capped with a Novel Titanium(IV)-Containing Polyoxomolybdate Cluster: Selective and Enhanced
Mónica Paesa1,2, Fernando Almazán3,4, Cristina Yus1,2
1Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza, 50009, Spain.
Small (Weinheim an Der Bergstrasse, Germany)
|October 5, 2023
Summary
Novel gold nanoparticles stabilized by polyoxometalates show potent antimicrobial activity against Gram-negative bacteria like Escherichia coli. These nanomaterials offer a promising, low-cytotoxicity alternative to traditional antibiotics.
Area of Science:
- Nanotechnology
- Materials Science
- Infectious Diseases
Background:
- Antibiotic resistance necessitates new antimicrobial strategies.
- Polyoxometalates (POMs) and gold nanoparticles (AuNPs) offer unique properties.
- Hybrid nanomaterials present novel therapeutic potential.
Purpose of the Study:
- To evaluate the antimicrobial performance of four polyoxometalate-stabilized gold nanoparticles (Au@POM) against bacterial pathogens.
- To investigate the efficacy of Au@POM against both planktonic and sessile bacterial forms.
- To explore the mechanism of action and cytotoxicity of promising Au@POM candidates.
Main Methods:
- Synthesis and characterization of four Au@POM hybrid nanostructures.
- Antimicrobial susceptibility testing against Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive).
- Minimum Inhibitory Concentration (MIC) determination.
- Cytotoxicity assays on five mammalian cell lines.
- Investigation of bactericidal mechanisms, including cell membrane integrity.
Main Results:
- Au@POM nanostructures demonstrated significant antimicrobial activity, particularly against E. coli.
- The Au@GeMoTi composite exhibited superior bactericidal efficiency with a low MIC of 3.12 µM against E. coli.
- Mechanism of action involves cell membrane hyperpolarization, disruption, and nucleotide leakage.
- Low cytotoxicity was observed on mammalian cell lines at effective antimicrobial doses.
Conclusions:
- Polyoxometalate-stabilized gold nanoparticles are effective antimicrobial agents, especially against Gram-negative bacteria.
- The Au@GeMoTi composite represents a highly efficient and selective nanomaterial for combating E. coli infections.
- These findings highlight the potential of Au@POM as a novel class of antibiotic-like agents with reduced host toxicity.
