Studies on the Antimicrobial Activities of Plasma Modified Cotton Coated with Chinese Herb Extracts

• Main Authors: Han-Jyun Lin, 林翰君
• Other Authors: Cheng-Hsian Tsai
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/avsm25

碩士 === 中原大學 === 土木工程研究所 === 99 === The antibacterial compounds extracted from Chinese herbs, such as Saposhnikovia Divaricate, Houttuynia cordata, and Mentha arvensis L evealed no side effects, no environmental hazard on human beings. More and more research are processed recently to study the antibiotic effect of Chinese herbs extracts. In this study, cotton was modified by an oxygen-based RF plasma and was coated by Mentha arvensis L extract to evaluate the inhibition efficiency of bioaerosols. The coating rate will be elevated as increasing applied power and extended modification time. When cotton was modified at the conditions: 5 sccm of O2, 0.05 torr of pressure, 30 W of power, and 60 seconds of modification, the coating rate of Mentha arvensis L extract increased from 6.8% (20 seconds) to 17.8%. Higher coating rate will lead to higher antibacterial effects. The coating rate is 5.6% and the inhibition efficiency of E. Coli reaches 99.7% after one time desorption by ultrasonic shaking. The coating rate is 2.4% and the inhibition efficiency of Staphylococcus aureus is 71.1% after one time desorption by ultrasonic shaking. The inhibition efficiency of Staphylococcus aureus elevated to 96.4% while the coating rate increased to 6.0%. The results of the pilot test showed that the filtration efficiency of E coli for unmodified cotton was 47.4%, which is lower than 56.7% for modified cotton (30 W, 20 seconds, 2.7% coating rate). The persistent inhibition efficiency of E.coli on unmodified cotton for 30 min still duration after filtration was 92% comparing with 0 min. It was near 100% on modified cotton for the same condition. Additionally, the filtration efficiency of Bacillus subtilis spores for unmodified cotton was 34.5%, which is lower than 43.5% for modified cotton (30 W, 20 seconds, 2.4% coating rate). The persistent inhibition efficiency of Bacillus subtilis spores on unmodified cotton for 30 min still duration after filtration was 82% comparing with 0 min. It was near 100% on modified cotton for the same condition. This study proved that not only the coating rate of Mentha arvensis L extract was improved, but also the inhibition efficiency of bioaerosols was elevated by modifying cotton in an oxygen-based RF plasma environment. Furthermore, the test result of Mentha arvensis L extract coated cotton further implied its potential application on antibacterial dressing.