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The Antibacterial Effect of Silver Nanoparticles on Staphylococcus epidermidis Strains with Different Biofilm-Forming
Denis Swolana1, Małgorzata Kępa1, Danuta Idzik1
1Department of Microbiology and Virology, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia, ul. Jagiellońska 4, 41-200 Sosnowiec, Poland.
Abstract:
Among many infectious diseases, infections caused by pathogens of Staphylococcus species exert a substantial influence upon human health, mainly due to their continuous presence on human skin and mucous membranes. For that reason, an intensive search for new, effective anistaphyloccocal agents can currently be observed worldwide. In recent years, there has been growing interest in nanoparticles, as compounds with potential antibacterial effect. The antibacterial activity of silver containing substances has been well recognized, but thoughtful studies focused on the effect of silver nanoparticles on bacterial biofilm are scarce. The aim of this study was to assess the influence of silver nanoparticles (AgNPs) with particle sizes in the range between 10 and 100 nm, and a concentration range from 1 to 10 µg/mL, upon Staphylococcus epidermidis strains with different biofilm-forming abilities (BFAs). The studies revealed the highest level of antimicrobial activity for AgNPs in relation to S. epidermidis strains with BFA, and what is more, the observed effect was proportional to the increasing particles' size, and strains not forming biofilm were more susceptible to silver nanoparticles with the smallest examined size, which was 10 nm.
Insights
Silver nanoparticles (AgNPs) show significant antibacterial effects against Staphylococcus epidermidis. Larger AgNPs were more effective against biofilm-forming strains, while smaller ones targeted non-biofilm strains.
Area of Science:
- Microbiology
- Nanotechnology
- Infectious Diseases
Background:
- Staphylococcus species are significant human pathogens due to their prevalence on skin and mucous membranes.
- There is a global need for novel anti-staphylococcal agents.
- Nanoparticles are being investigated for their potential antibacterial properties, with silver nanoparticles (AgNPs) showing recognized activity, though their effect on bacterial biofilms requires further study.
Purpose of the Study:
- To evaluate the impact of silver nanoparticles (AgNPs) on Staphylococcus epidermidis strains with varying biofilm-forming abilities (BFAs).
- To determine the influence of AgNP particle size and concentration on antimicrobial activity.
Main Methods:
- Testing AgNPs (10-100 nm particle size, 1-10 µg/mL concentration) against S. epidermidis strains.
- Assessing antimicrobial activity in relation to bacterial biofilm-forming abilities.
- Correlating AgNP effectiveness with particle size and bacterial susceptibility.
Main Results:
- AgNPs exhibited the highest antimicrobial activity against biofilm-forming S. epidermidis strains.
- The efficacy of AgNPs against biofilm-forming strains increased proportionally with particle size.
- Non-biofilm-forming strains were more susceptible to smaller AgNPs (10 nm).
Conclusions:
- Silver nanoparticles demonstrate potent anti-staphylococcal activity, particularly against biofilm formation.
- Particle size is a critical factor influencing AgNP efficacy, with larger sizes optimal for biofilm inhibition and smaller sizes for planktonic bacteria.
- AgNPs represent a promising therapeutic strategy against Staphylococcus epidermidis infections.
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