Assessing the effect of different natural dissolved organic matters on the cytotoxicity of titanium dioxide nanoparticles with bacteria

作     者：Xiaojia He Donee' McAlliser Winfred G. Aker Huey-min Hwang 

作者机构：Department of Biology Jackson State University Jackson MS 39217 USA Environmental Science Ph.D. Program Jackson State University Jackson MS 39217 USA 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2016年第28卷第10期

页      面：230-236页

核心收录：

学科分类：07[理学] 09[农学] 0903[农学-农业资源与环境] 0713[理学-生态学] 

基　　金：supported by the National Science Foundation-Centers of Research Excellence in Science and Technology (NSF-CREST) (No. HRD-0833178) the National Institutes of Health (NIH) Research Initiative for Scientific Enhancement (RISE) Program (No. 5R25GM067122) 

主　　题：TiO2 nanoparticlesHumic acid Tannic acid CytotoxicityROS 

摘      要：Titanium dioxide nanoparticles （TiO2 NPs） are among the most widely manufactured nanomaterials on a global scale. However, prudent and vigilant surveillance, incumbent upon the scientific community with the advent of new technologies, has revealed potentially undesirable effects of TiO2 NPs on biological systems and the natural environment during their application and discharge. Such effects are likely best evaluated by first assessing the fate of the TiO2 NPs in natural environments. In this study, the effects of terrestrial humic acid （HA） and tannic acid （TA）, two major members of the collective： dissolved organic matter （DOM）, on the cytotoxicity of TiO2 NPs to Escherichia coli were investigated in the presence and absence of natural sunlight. Qualitative （transmission electron microscopy （TEM）） and quantitative （LCso） analyses were employed in this study. In addition, the production of reactive oxygen species （ROS） in the form of .OH was further assessed-as HA or TA increased the production of ROS decreased. The inhibition of bacterial viability in the light treatment groups, with respective treatment organics at concentrations of 10 ppm, was less in TA than in terrestrial HA. SAS was used to analyze the treatment effect of individual factors of light irradiation, DOM, and concentration of TiO2 NPs.