Abstract
ABSTRACTThe application of grapefruit seed extract (GSE) and air ions to filters was investigated with the goal of collecting indoor bioaerosols. GSE exhibits antimicrobial activity because it contains flavonoids such as naringin. Air ions are usually generated by electric ionizers and can inactivate bacteria, viruses, and fungi. In this study, GSE particles were coated onto three different filters: polypropylene (PP), activated carbon fiber (ACF), and metal foam (MF). Ions were supplied to the filter surface using an ionizer. The rate of surface inactivation of Staphylococcus aureus was measured. When only GSE was applied to the filters, the inactivation rate was about 60%; when air ions were applied, the rate was about 70–80%. When both GSE and ions were applied simultaneously, the inactivation rate increased to 80–90%. The physical collection efficiencies of the as-purchased filters were in the following order: PP > ACF > MF. However, when ions were supplied to the filters, the collection efficiencies increased to over 98% for each filter. The inactivation rate of the ACF filter was the highest (92.5%). Therefore, we conclude that the ACF filter is the most efficient of these three filters for inactivating S. aureus.
Highlights
Bioaerosols are particulate matter suspended in the air, such as pollen, fungi, viruses, and bacteria
When only grapefruit seed extract (GSE) was applied to the filters, the inactivation rate was about 60%; when air ions were applied, the rate was about 70–80%
We have investigated the antimicrobial effect of GSE and ions on air filters of PP, activated carbon fiber (ACF), and metal foam (MF)
Summary
Bioaerosols are particulate matter suspended in the air, such as pollen, fungi, viruses, and bacteria. Controlling such aerosols is one of the most important issues for indoor air quality. People are becoming more susceptible to various diseases due to bioaerosols, because airborne diseases are increasing and people are spending more time in crowded spaces. Air-purifying technology and heating, ventilating, and air-conditioning technology are alternatives for reducing this threat. Air filters are usually used to capture pollutants from the air, and would accumulate pollutants. Without appropriate action such as replacement or washing, such filters can become another source of bioaerosols because living organisms can grow on their surfaces (Batterman et al, 1995)
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