Can disc diffusion susceptibility tests assess the antimicrobial activity of engineered nanoparticles?
Source abstract
Abstract
The use of disc diffusion susceptibility tests to determine the antibacterial activity of engineered nanoparticles (ENPs) is questionable because their low diffusivity practically prevents them from penetrating through the culture media. In this study, we investigate the ability of such a test, namely the Kirby-Bauer disc diffusion test, to determine the antimicrobial activity of Au and Ag ENPs having diameters from 10 to 40 nm on Escherichia coli cultures. As anticipated, the tests did not show any antibacterial effects of Au nanoparticles (NPs) as a result of their negligible diffusivity through the culture media. Ag NPs on the other hand exhibited a strong antimicrobial activity that was independent of their size. Considering that Ag, in contrast to Au, dissolves upon oxidation and dilution in aqueous solutions, the apparent antibacterial behavior of Ag NPs is attributed to the ions they release. The Kirby-Bauer method, and other similar tests, can therefore be employed to probe the antimicrobial activity of ENPs related to their ability to release ions rather than to their unique size-dependent properties.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Nanoparticles: synthesis and applications · Gold and Silver Nanoparticles Synthesis and Applications · Coagulation and Flocculation Studies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (32)
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