文献类型：期刊文献

英文题名：Nano-titanium dioxide (TiO2)-induced changes affecting Cu2+-mediated alterations in bacterium Bacillus subtilis and α-amylase

作者：Zhao, Yuxia[1]; Lin, Kuangfei[1]; Zhang, Wei[1]

机构：[1] State Environmental Protection Key Laboratory of Environmental, Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China

年份：2010

卷号：92

期号：10

起止页码：1851

外文期刊名：Toxicological and Environmental Chemistry

收录：EI(收录号：20104313335070)

语种：英文

外文关键词：Bacteriology - Amylases - Bacteria - Copper compounds - Toxicity

摘要：Titanium dioxide (TiO2) nanoparticles possess the potential to coexist with Copper (Cu2+) in soil. The individual and combined toxicity of these two chemicals was evaluated using the bacterium Bacillus subtilis, a known soil model bacterium. Cu2+ (6.25-50 μgmL-1) alone produced toxicity to bacteria as evidenced by the decreased cell viability and deceased α-amylase production. The addition of TiO2 (50 μgmL-1) enhanced the Cu2+-induced decrease in cell viability but elevated amylase activity. TiO2 did not markedly affect the growth rate and lag period. A primary cause of TiO2 increasing Cu2+ toxicity is presumed to be associated with hydroxyl radical formation, while increased amylase activity is considered to arise from Cu2+ facilitating TiO2 degradation ability. ? 2010 Taylor & Francis.