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. 2023 Jan 20;13(3):428.
doi: 10.3390/nano13030428.

Ostwald Ripening and Antibacterial Activity of Silver Nanoparticles Capped by Anti-Inflammatory Ligands

Romina Alarcon  1 , Mariana Walter  1 , Maritza Paez  1 , Manuel Ignacio Azócar  1
Affiliations

Ostwald Ripening and Antibacterial Activity of Silver Nanoparticles Capped by Anti-Inflammatory Ligands

Romina Alarcon et al. Nanomaterials (Basel). .

Abstract

Silver nanoparticles (AgNPs) have been extensively studied during recent decades as antimicrobial agents. However, their stability and antibacterial activity over time have yet to be sufficiently studied. In this work, AgNPs were coated with different stabilizers (naproxen and diclofenac and 5-chlorosalicylic acid) in different concentrations. The suspensions of nanostructures were characterized by transmission electron microscopy, UV-Vis and FT-IR spectroscopic techniques. The antibacterial activity as a function of time was determined through microbiological studies against Staphylococcus aureus. The AgNPs show differences in stabilities when changing the coating agent and its concentration. This fact could be a consequence of the difference in the nature of the interaction between the stabilizer and the surface of the NPs, which were evaluated by FT-IR spectroscopy. In addition, an increase in the size of the nanoparticles was observed after 30 days, which could be related to an Ostwald maturation phenomenon. This result raises new questions about the role that stabilizers play on the surface of NPs, promoting size change in NPs. It is highly probable that the stabilizer functions as a growth controller of the NPs, thus determining an effect on their biological properties. Finally, the antibacterial activity was evaluated over time against the bacterium Staphylococcus aureus. The results showed that the protective or stabilizing agents can play an important role in the antibacterial capacity, the control of the size of the AgNPs and additionally in the stability over time.

Keywords: antibacterial; nanoparticles; silver.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
UV–Vis spectrum: (a) AgNP-Bare, (b1) AgNP-5-Cl (1), (b2) AgNP-5-Cl (2), (b3) AgNP-5-Cl (3), (c1) AgNP-Dic (1), (c2) AgNP-Dic (2), (c3) AgNP-Dic (3), (d1) AgNP-Nap (1), (d2) AgNP-Nap (2), (d3) AgNP-Nap (3), every 7 days and up to 28 days.
Figure 2
Figure 2
TEM images of the synthesized AgNPs and after 30 days. Size distribution of AgNPs calculated from TEM images.
Figure 3
Figure 3
TEM images of the synthesized AgNPs and after 30 days.
Figure 4
Figure 4
Size distribution of AgNPs calculated from TEM images.
Figure 5
Figure 5
Antibacterial activity over time of silver nanoparticles against Staphylococcus aureus.
See this image and copyright information in PMC

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