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Bactericidal and Photoeatalytie Activity of Fe^(3+)-TiO_2 Thin Films Prepared by the Sol-gel Method

Journal of Wuhan University of Technology(Materials Science) 2008年第2期23卷 155-158页

作者： WANG Xun GONG Wenqi School of Resources and Environmental Engineering Wuhan University of Technology Wuhan 430070 China School of Urban Construction Wuhan University of Science and Technology Wuhan 430070 China

Pure TiO2 thin films and iron doped TiO2 thin films on glass substrate were prepared by sol-gel method, and characterized by X-ray diffractometer （XRD）, thermo-gravimetric analysis （TG-DSC）, high resolution transmission electron microscope （HRTEM）, scanning electron microscope （SEM） and UV-Vis spectroscopy, respectively. The experimental results show that the pure TiO2 thin films and iron doped TiO2 thin films can destroy most of the escherichia coli and bacillus subtillis under the irradiation of 365 nm UV-light. However, the iron doped TiO2 thin film is a better photocatalyst than pure TiO2 thin film. The ultrastructural studies provide direct evidences for understanding the bactericidal mechanism of the TiO2 photocatalyst.

关键词： sol-gel method bactericidal and photocatalytic activity escherichia coli bacillus subtillis iron doped TiO2 film

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Chemical Constituents in Essential Oils from Elsholtzia ciliata and Their Antimicrobial Activities

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Chinese Herbal Medicines 2013年第2期5卷 104-108页

作者： TIAN Guang-hui School of Chemical and Environmental Sciences Shaanxi University of Technology

Objective To compare the chemical constituents in the essential oils from the leaves, flowers, and seeds of Elsholtzia ciliata and their antimicrobial activities. Methods The chemical constituents in essential oils were extracted by the hydro-distillation method and analyzed by GC-MS. The chemical constituents in essential oils were identified on the basis of comparison on their retention indices and MS spectrum with published data. Moreover, the antimicrobial activities of the chemical constituents in the oils against the growth of six bacteria strains and one pathogenic yeast strain were evaluated by using minimum inhibitory concentration and minimum bactericidal concentration methods. Results A total of 58 compounds were identified, while compounds 31, 35, and 36 were identified in the essential oils from the leaves, flowers, and seeds, respectively. Fifteen compounds were identified as shared constituents in the leaves, flowers, and seeds. The chemical constituents in the essential oils showed the inhibitory activities against the six bacteria strains and the yeast strain. Conclusion The major constituents are different in the essential oils of the leaves, flowers, and seeds. The major chemical constituents in the essential oils are monoterpenoids and sesquiterpenoids. And the chemical constituents in the essential oils obtained from the leaves show higher inhibitory activities especially against bacillus subtillis CMCC63501 and Escherichia coli ATCC25922.

关键词： antimicrobial activity bacillus subtillis Elsholtzia ciliata essential oils monoterpenoids

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