Chong, Eui-seok Hwang, Gi Byoung Nho, Chu Won Kwon, Bo Mi Lee, Jung Eun Seo, SungChul Bae, Gwi-Nam Jung, Jae Hee 2024-01-20T13:01:55Z 2024-01-20T13:01:55Z 2021-09-01 2013-02-01 0048-9697 https://pubs.kist.re.kr/handle/201004/128366 Airborne biological particles containing viruses, bacteria, and/or fungi can be toxic and cause infections and allergy symptoms. Recently, natural materials such as tea tree oil and Sophora flavescens have shown promising antimicrobial activity when applied as air filter media. Although many of these studies demonstrated excellent antimicrobial efficacy, only a few of them considered external environmental effects such as the surrounding humidity, temperature, and natural degradation of chemicals, all of which can affect the antimicrobial performance of these natural materials. In this study, we investigated the antimicrobial durability of air filters containing airborne nanoparticles from S. flavescens for 5 months. Antimicrobial tests and quantitative chemical analyses were performed every 30 days. Morphological changes in the nanoparticles were also evaluated by scanning electron microscopy. The major antimicrobial compounds remained stable and active for similar to 90 days at room temperature. After about 90 days, the quantities of major antimicrobial compounds decreased noticeably with a consequent decrease in antimicrobial activity. These results are promising for the implementation of new technologies using natural antimicrobial products and provide useful information regarding the average life expectancy of antimicrobial filters using nanoparticles of S. flavescens. (C) 2012 Elsevier B.V. All rights reserved. English ELSEVIER WALL CARBON NANOTUBES LEGIONNAIRES-DISEASE SILVER NANOPARTICLES PULMONARY TOXICITY ESCHERICHIA-COLI BACILLUS-SUBTILIS INACTIVATION RESPONSES BACTERIA BIOAEROSOLS Antimicrobial durability of air filters coated with airborne Sophora flavescens nanoparticles Article 10.1016/j.scitotenv.2012.11.075 1 SCIENCE OF THE TOTAL ENVIRONMENT, v.444, pp.110 - 114 SCIENCE OF THE TOTAL ENVIRONMENT 444 110 114 scie scopus 000316240200011 2-s2.0-84871363955 Environmental Sciences Environmental Sciences & Ecology Article WALL CARBON NANOTUBES LEGIONNAIRES-DISEASE SILVER NANOPARTICLES PULMONARY TOXICITY ESCHERICHIA-COLI BACILLUS-SUBTILIS INACTIVATION RESPONSES BACTERIA BIOAEROSOLS Natural product Nanoparticles Antimicrobial filter Durability Sophora flavescens