A highly sensitive,dual-signal assay based on rhodamine B covered silver nanoparticles for carbamate pesticides |
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| Authors: | Qing-Jiao Luo Yong-Xin Li Meng-Qian Zhang Ping Qiu Yong-Hui Deng |
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| Institution: | a Department of Chemistry, Nanchang University, Nanchang 330031, China;
b Department of Chemistry, State Key Laboratory of Molecular Engineering of Polymers, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, State Key Laboratory of ASIC & System, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai 200433, China |
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| Abstract: | A highly sensitive sensor for determination of carbamate pesticides based rhodamine B (RB) modified silver nanoparticle (RB-AgNPs) was developed. Compared with the classical method, it combined colorimetric with fluorescence for detecting carbamate pesticides in complex solutions. Carbamate pesticides can inhibit the activity of acetylcholinesterase (AChE), thus preventing the generation of thiocholine. On the other hand, thioncholine can transform the yellow RB-AgNPs solutions gray color and unquenches the fluorescence of RB simultaneously. Once the activity of AChE was inhibited by the pesticide, the color of the RB-AgNPs solution remains yellow and the fluorescence of RB molecules remains quenched. Under optimized experimental conditions, carbaryl was detected in a concentration range from 0.1 ng/L to 8.0 ng/L with a detection limit of 0.023 ng/L (it was detected by fluorescence spectra). This simple method is suitable for determination of carbamate pesticides in complex samples, such as tomato, apple and river water. |
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| Keywords: | RB-AgNPs AChE Colorimetric Fluorometric Cabamate pesticides |
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