Related Experiment Video
Updated: Jul 10, 2026
11:52
Evaluation of Antimicrobial Activities of Nanoparticles and Nanostructured Surfaces In Vitro
Published on: April 21, 2023
Chitosan-coated silver nanoparticles amplify glycopeptide efficacy against Staphylococcus aureus
Sakshi V Khairnar1, Anna Sommers2, Elena Muldiiarova2
1Center for Drug Delivery and Nanomedicine, Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, NE, United States.
Frontiers in Microbiology
|July 9, 2026
Summary
A novel silver nanoparticle-vancomycin-chitosan nanocomposite (AgNPs/Van/CS) effectively combats antibiotic-resistant Staphylococcus aureus. This enhanced delivery system shows superior antibacterial and antibiofilm activity compared to vancomycin alone.
Area of Science:
- Materials Science
- Nanotechnology
- Infectious Diseases
Background:
- Antibiotic resistance, particularly in Staphylococcus aureus, poses a significant global health threat.
- Vancomycin is a critical antibiotic for severe Gram-positive infections, but resistance is emerging.
- Vancomycin-intermediate (VISA) and vancomycin-resistant (VRSA) strains present treatment challenges.
Purpose of the Study:
- To develop a novel nanocarrier system for vancomycin delivery.
- To enhance the therapeutic efficacy of vancomycin against resistant bacterial strains.
- To create a stable, biocompatible nanocomposite with improved antibacterial and antibiofilm properties.
Main Methods:
- Fabrication of carboxylic acid-capped silver nanoparticles (AgNPs).
- Engineering of a nanocomposite (AgNPs/Van/CS) using electrostatic interactions and chitosan coating.
- Evaluation of antibacterial and antibiofilm activity against methicillin-sensitive (MSSA), methicillin-resistant (MRSA), and vancomycin-intermediate (VISA) Staphylococcus aureus strains.
Main Results:
- The AgNPs/Van/CS nanocomposite demonstrated significantly enhanced antibacterial activity compared to vancomycin alone.
- The nanocomposite exhibited potent antibiofilm activity against all tested Staphylococcus aureus strains.
- Effective bacterial inhibition was achieved at lower vancomycin concentrations with the AgNPs/Van/CS system.
Conclusions:
- AgNPs/Van/CS represents a promising strategy for improving vancomycin efficacy against challenging Staphylococcus aureus infections.
- The nanocarrier system effectively overcomes vancomycin resistance mechanisms.
- This approach offers a potential solution to the growing problem of antibiotic resistance.
Keywords:
Staphylococcus aureusantibiotic resistanceantimicrobial agentsglycopeptide antibioticssilver nanoparticlesvancomycinMore Related Videos
Related Concept Videos
01:25Clinical Significance of Antibiotic Resistance
Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within the One...
01:23Inhibitors of Gram-positive Cell Wall Synthesis
Bacterial cell walls are typically rigid structures composed mainly of peptidoglycan, a mesh-like polymer that provides mechanical strength and maintains cell shape. The synthesis of peptidoglycan is a crucial process in bacterial growth and serves as a primary target for many antibiotics.Mechanism of Action of Beta-Lactam AntibioticsBeta-lactam antibiotics, such as penicillin, inhibit peptidoglycan synthesis in actively growing cells. These antibiotics share a characteristic four-membered...
01:27Combined Effects of Drugs: Synergism
Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
Such synergistic combinations...
Such synergistic combinations...
01:25Inhibitors of Bacterial Protein Synthesis
Aminoglycosides constitute a highly potent class of bactericidal antibiotics that exert their antimicrobial effects by targeting the bacterial ribosome, specifically disrupting protein synthesis. These polycationic molecules consist of amino-modified sugars linked via glycosidic bonds to an aminocyclitol core such as 2-deoxystreptamine or streptamine. Their strong positive charges facilitate tight binding to the negatively charged phosphate backbone of ribosomal RNA (rRNA), primarily at the 16S...
01:28Antimicrobial Effectiveness
The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...
01:25Mechanism of Antibiotic Resistance in MRSA
Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and acquisition...