Abstract
The formation of biofilms by bacterial pathogens and the presence of persister cells in biofilms have become major concerns in the health sector, owing to their antibiotic resistance and tolerance. The transformation of bacterial pathogens into persister cells, either stochastically or due to stressful environmental factors, results in recalcitrant and recurring infections. Here, we sought to prepare gold nanoparticles from naturally occurring caffeine and explore their inhibitory action against biofilm formation and persister cells. Fourier transform infrared spectroscopy, UV-visible absorption spectroscopy, field emission transmission electron microscopy, energy-dispersive X-ray diffraction, and dynamic light scattering were used to characterize the gold nanoparticles obtained from caffeine (Caff-AuNPs). The Caff-AuNPs were found to exhibit a number of properties, including the ability to prevent biofilm formation, disperse mature biofilms, and kill different types of persister of gram-positive (Staphylococcus aureus and Listeria monocytogenes) and gram-negative (Pseudomonas aeruginosa and Escherichia coli) pathogenic bacteria. Microscopic analysis of the aforementioned bacterial cells, treated with Caff-AuNPs, revealed the bactericidal effect of Caff-AuNPs, although the underlying mechanism remains unknown. Collectively, the Caff-AuNPs synthesized in this study may be used as potential drugs to combat chronic infections caused by biofilm-forming pathogenic bacteria.
Key points
• Biofilm and persister cells are clinically relevant, as they either prolong or completely resist antibiotic treatments.
• Caffeine is used in the green synthesis of Caff-AuNPs, which have antibacterial and antibiofilm properties.
• Caff-AuNPs are effective against various pathogenic bacterial persister cells.
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This work was supported by Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education (NRF-2019R1A2C1087156).
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FK and YMK conceived the idea of the present study, designed the experiment, analyzed the data, and wrote the paper. The experiment was carried out by FK, SKP, NIB, and DKO.
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Khan, F., Park, SK., Bamunuarachchi, N.I. et al. Caffeine-loaded gold nanoparticles: antibiofilm and anti-persister activities against pathogenic bacteria. Appl Microbiol Biotechnol 105, 3717–3731 (2021). https://doi.org/10.1007/s00253-021-11300-3
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DOI: https://doi.org/10.1007/s00253-021-11300-3