中文摘要：一旦有机磷农药被广泛作为除草剂、杀虫剂甚至于恐怖分子化学战剂使用，将会对公共卫生、环境、食品和国土安全造成严重威胁，因此，迫切需要一个可原位检测污染物且敏捷可靠地化学传感器。本文提供了一个基于石墨烯杂化纳米复合材料且具有四种传感单元的游离酶阻抗电子舌进行有机磷农药检测。该电子舌系统能够识别纳摩尔浓度水平的有机磷农药，可以对有机磷农药混合物进行分析和监测。此外，传感单元具有高比表面积、高稳定性、重现性好、灵敏度高且能够识别浓度低至0.1 nmol/L农残等优点。因此，该电子舌系统可作为快速、简单、低成本检测低浓度范围有机磷农药的有效工具。
外文摘要：Organophosphate (OP) compounds impose significant strains on public  health, environmental/food safety and homeland security, once they have been widely used as pesticides and insecticides and also displaypotential to be employed as chemical warfare agents by terrorists. In this context, the development of sensitive and reliable chemical sensors that would allow in-situ measurements of such contaminants is highly pursued. Here we report on a free-enzyme impedimetric electronic tongue (e-tongue) used in the analysis of organophosphate pesticides comprising four sensing units based on graphene hybrid nanocomposites. The nanocomposites were prepared by reduction of graphene oxide in the presence of conducting polymers (PEDOT:PSS and polypyrrole) and gold nanoparticles (AuNPs), which were deposited by drop casting onto gold interdigitated electrodes. Impedance spectroscopy measurements were collected in triplicate for each sample analyzed, and the electrical resistance data were treated by Principal Component Analysis (PCA), revealing that the system was able to discriminate OPs at nanomolar concentrations. In addition, the electronic tongue system could detectOPs in real samples, where relations between the principal components and the variation of pesticides in a mixture were established, proving to be useful to analyze and monitor mixtures of OP pesticides. The materials employed provided sensing units with high specific surface area and high conductivity, yielding the development of a sensor with suitable stability, good reproducibility, and high sensitivity towards pesticide samples, being able to discriminate concentrations as low as 0.1 nmol L-1 Our results indicate that the e-tongue system can be used as a rapid, simple and low cost alternative in the analyses of Ops pesticide solutions below the concentration range permitted by legislation of some countries.
 
外文关键词：Electronic tongue, Impedance spectroscopy, Organophosphate pesticides, Reduced graphene oxide, Nanocomposite
作者：Facure, Murilo H. M.; Mercante, Luiza A.; Mattoso, Luiz H. C.; Correa, Daniel S.
作者单位：Embrapa Instrumentat, LNNA, BR-13560970 Sao Carlos, SP, Brazil.
期刊名称：TALANTA
期刊影响因子：4.035
出版年份：2017
出版刊次：3
点击下载：采用基于石墨烯杂化纳米复合材料的电子舌检测痕量有机磷农药