The antifungal efficacy of nano-metals supported TiO2 and ozone on the resistant Aspergillus niger spore

Kuo Pin Yu*, Yi Ting Huang, Shang Chun Yang

*此作品的通信作者

研究成果: Article同行評審

39 引文 斯高帕斯(Scopus)

摘要

Recently, antimicrobial efficacy of nano-metals has been extensively investigated. However, most of the related studies focused on the bactericidal effectiveness. Molds, especially their spores, are more resistant than bacteria, and can build a high concentration in houses due to dampness. Therefore, a comprehensive evaluation of the antifungal effectiveness of nano-metals is necessary.In this study, the nano-metals (Ag, Cu and Ni) supported catalysts were successfully prepared by the incipient wetness impregnation method, while the titanium dioxide (Degussa (Evonik) P25) nanoparticle was served as the support. The antifungal experiments of Aspergillus niger spores were conducted on two surfaces (quartz and putty) in the darkness with and without ozone exposure, respectively. The critical Ag concentration to inhibit the germination and growth of A. niger spores of 5wt% nano Ag catalyst was 65mg/mL, lower than several cases in previous studies. The inactivation rate constants (k) of A. niger spores on nano-metals supported catalysts in the presence of ozone (k=0.475-0.966h-1) were much higher than those in the absence of ozone (k=0.001-0.268h-1). However, on the surface of TiO2 particles, no antifungal effect was observed until 6-h exposure to ozone. Consequently, ozone has a synergetic effect on nano-metals antifungal efficacy.

原文English
頁(從 - 到)155-162
頁數8
期刊Journal of Hazardous Materials
261
DOIs
出版狀態Published - 15 10月 2013

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