A highly sensitive, dual-signal assay based on rhodamine B covered silver nanoparticles for carbamate pesticides
| Autor: | Yonghui Deng, Meng-Qian Zhang, Yong-Xin Li, Qing-Jiao Luo, Ping Qiu |
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| Rok vydání: | 2017 |
| Předmět: |
Detection limit
Chromatography Chemistry 010401 analytical chemistry 02 engineering and technology General Chemistry Pesticide 021001 nanoscience & nanotechnology 01 natural sciences Acetylcholinesterase Fluorescence Silver nanoparticle 0104 chemical sciences chemistry.chemical_compound Thiocholine Carbaryl Rhodamine B 0210 nano-technology |
| Zdroj: | Chinese Chemical Letters. 28:345-349 |
| ISSN: | 1001-8417 |
| DOI: | 10.1016/j.cclet.2016.10.024 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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