摘要
介绍了一种基于大肠杆菌(Escherichia coli)的CellSense生物传感器毒性分析系统,对其毒性分析条件进行了初步优化,并探讨了其在重金属离子生物急性毒性分析中的应用性能.结果表明,以p-苯醌为电子传递介质时,基于大肠杆菌的CellSense生物传感器具有良好的毒性分析特性,测试得Hg2+、Cu2+、Zn2+和Ni2+四种金属离子的EC50分别为1.1、6.5、66.0和119.0μg·mL-1;呼吸基质的pH低于6.0和盐度(NaCl)高于3%(w/w)时,对E.coli的活性产生一定的抑制作用.
A cost-effective strategy using an amperometric biosensor with Escherichia coli (E. coli ) that provides a rapid toxicity determination of toxicants is described. The Cellsense biosensor system comprises a biological component immobilized in intimate contact with a transducer which converts the biochemical signal into a quantifiable electrical signal. It is showed that CeUSense biosensor with E. coli has a good performance when p-benzoquinone is chosen as redox mediator. The 50% effective concentrations (EC50)values of Hg^2+, Cu^2+, Zn^2+ and Ni^2+ are 1.1, 6.5, 66.0 and 119.0μg.mL^-1, respectively, which are in accordance with the results of conventional bacterial counting method. When the respiratory substrates pH is lower than about 6.0 and salinity(NaCl) is higher than 3%(w/w), the activity of E. coli is inhibited significantly.
出处
《生态毒理学报》
CAS
CSCD
2009年第1期108-113,共6页
Asian Journal of Ecotoxicology
基金
国家自然科学基金项目(No.20707014)
教育部留学回国人员科研启动基金
关键词
微生物传感器
介质
毒性
重金属
microbial biosensor
mediator
toxicity
heavy metal
作者简介
贺莹(1985-),女,硕士研究生;
通讯作者(Correspondingauthor),E-mail:wangxj@tongji.edu.cn 王学江(1974-),男,同济大学环境科学与工程学院副教授,硕士生导师,主要从事水污染控制技术和新型生物传感器环境监测技术研究.Tel:021—65982695.