Sterilization effect of UV light on Bacillus spores using TiO(2) films depends on wavelength.
Sterilization effect of UV light on Bacillus spores using TiO(2) films depends on wavelength.
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DOI：
10.2152/jmi.59.53
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
L. Nhung;H. Nagata;A. Takahashi;Mutsumi Aihara;T. Okamoto;T. Shimohata;K. Mawatari;M. Akutagawa-
中科院分区：
文献类型：
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作者：
L. Nhung;H. Nagata;A. Takahashi;Mutsumi Aihara;T. Okamoto;T. Shimohata;K. Mawatari;M. Akutagawa-
紫外光和光催化剂如二氧化钛(TiO(2))和银(Ag)可用于水和表面的消毒。然而，紫外光波长对光催化杀灭孢子的影响还不是很清楚。用不同的紫外光波长和TiO(2)或TiO(2)/Ag复合材料对芽孢杆菌进行了灭活试验。在二氧化钛和银光催化剂的存在下，炭疽芽孢杆菌和短芽孢杆菌繁殖体细胞的UVA杀菌效果较好，但对芽胞的杀灭效果不明显。短杆菌孢子对UVB和UVC的敏感性略高于大西洋芽胞杆菌孢子。UVC和UVB对孢子的光催化杀灭作用最强，UVA最弱。二氧化钛对芽孢杆菌芽胞的灭活率有显著提高，但与银的灭活率差异不显著。由此可见，TiO(2)/Ag+UVA可用于营养细胞的杀菌，而TiO(2)和UVC对孢子有较好的杀灭效果。
UV light and photocatalysts such as titanium dioxide (TiO(2)) and silver (Ag) are useful for disinfection of water and surfaces. However, the effect of UV wavelength on photocatalytic disinfection of spores is not well understood. Inactivation of Bacillus spores has been examined using different UV wavelengths and TiO(2) or TiO(2)/Ag composite materials. The level of UVA disinfection of Bacillus anthracis and Bacillus brevis vegetative cells increased with the presence of the TiO(2) and Ag photocatalysts, but had little effect on their spores. B. brevis spores were slightly more sensitive to UVB and UVC than the spores of B. atrophaeus. Photocatalytic sterilization against spores was strongest in UVC and UVB and weakest in UVA. The rate of inactivation of Bacillus spores was significantly increased by the presence of TiO(2), but was not markedly different from that induced by the presence of Ag. Therefore, TiO(2)/Ag plus UVA can be used for the sterilization of vegetative cells, while TiO(2) and UVC are effective against spores.