Use of electrosprayed Sophora flavescens natural-product nanoparticles for antimicrobial air filtration
- Use of electrosprayed Sophora flavescens natural-product nanoparticles for antimicrobial air filtration
- 정재희; 이정은; 배귀남
- electrospray; nanoparticles; natural product; antimicrobial filter; sophora flavescens; Plant extract
- Issue Date
- Journal of aerosol science
- VOL 57, 185-193
- Previously, we demonstrated that electrospraying, driven by high-intensity electric fields,
can be used to generate stable antimicrobial nanoparticles continuously from ethanolic
extracts of natural plant products. In this study, we evaluated the performance of
antimicrobial air filters made by these electrosprayed natural-product nanoparticles. As a
natural antimicrobial suspension, an ethanolic extract of Sophora flavescens Ait. was
sprayed in steady cone-jet mode using our specially designed electrospray system (Jung
et al., 2011b). Natural-product nanoparticles with a bimodal size distribution were
electrosprayed and deposited continuously onto the surfaces of air filters at various
concentrations. The physical (filtration efficiency, pressure drop, and fiber morphology)
and biological (antimicrobial efficacy against airborne Staphylococcus epidermidis) characteristics
were evaluated. Consequently, although the filter pressure drop increased with
the amount of nanoparticles on the filter, the antimicrobial activity was enhanced.
Compared with the conventional nebulization process, the filters generated by electrospraying
S. flavescens natural-product nanoparticles resulted in more effective removal of S.
epidermidis bioaerosols. These results will facilitate the implementation of this new
technology to control air quality and protect against hazardous airborne microorganisms.
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