Fungus-mediated biosynthesis and characterization of TiO₂ nanoparticles and their activity against pathogenic bacteria

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• 作者：G. Rajakumar^a ; A. Abdul Rahuman^a ; ^{abdulrahuman6@hotmail.com} ; S. Mohana Roopan^b ; V. Gopiesh Khanna^c ; G. Elango^a ; C. Kamaraj^a ; A. Abduz Zahir^a ; K. Velayutham^a
• 关键词：Biosynthesis ; Aspergillus flavus ; Titanium dioxide nanoparticles ; XRD ; Atomic force microscope ; Antimicrobial
• 刊名：Spectrochimica Acta Part A ; Molecular and Biomolecular Spectroscopy
• 出版年：2012
• 期刊代码：99_13861425
• 类别：ch
• 出版时间：June, 2012
• 卷：91
• 期：Complete
• 页码：23-29
• 文件大小：1409 K

摘要

In the present study, the biosynthesis of TiO₂ nanoparticles (TiO₂ NPs) was achieved by a novel, biodegradable and convenient procedure using Aspergillus flavus as a reducing and capping agent. Research on new, simple, rapid, eco-friendly and cheaper methods has been initiated. TiO₂ NPs were characterized by FTIR, XRD, AFM, SEM and TEM studies. The X-ray diffraction showed the presence of increased amount of TiO₂ NPs which can state by the presence of peaks at rutile peaks at 1 0 0, 0 0 2, 1 0 0 and anatase forms at 1 0 1 respectively. SEM observations revealed that synthesized TiO₂ NPs were spherical, oval in shape; individual nanoparticles as well as a few aggregate having the size of 62-74 nm. AFM shows crystallization temperature was seen on the roughness of the surface of TiO₂. The Minimum inhibitory concentration value for the synthesized TiO₂ NPs was found to be 40 渭g ml^鈭? for Escherichia coli, which was corresponding to the value of well diffusion test. This is the first report on antimicrobial activity of fungus-mediated synthesized TiO₂ NPs, which was proved to be a good novel antibacterial material.