In this study, we developed a rapid colorimetric method for the detection of deltamethrin using gold nanoparticles modified with 2-mercapto-6-nitrobenzothiazole (Au NPs–MNBT): deltamethrin adhered onto the surface of Au NPs–MNBT and a core–shell structure formed with Au NPs–MNBT as the core and deltamethrin as the shell. The formation of the core–shell structure caused the change of solution color and UV-visible absorption spectra of Au NPs, which can be used to quantitatively detect deltamethrin by the naked eye and using a UV-Vis spectrophotometer. The effect of MNBT content, detection pH and reaction time on the detection of deltamethrin was studied in detail, and the selectivity and anti-interference ability of the probe were tested. The results showed that the probe can be used to detect deltamethrin rapidly and accurately from 13 kinds of other pesticides. The detection of deltamethrin was not affected when 5 times the concentration of other pesticides coexisted with deltamethrin. The detection limit of deltamethrin was observed to be 0.25 μM by the naked eye and 0.005 μM by UV-Vis spectroscopy. The extract solutions of small tomato and cherry were used to evaluate the feasibility of this detection method in actual samples and the results were consistent with that of gas chromatography-mass spectrometry, which proved that the developed method has actual sample application potential for deltamethrin detection.

中文翻译：

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基于2-巯基6-硝基苯并噻唑修饰的金纳米粒子的快速比色法检测溴氰菊酯

在这项研究中，我们开发了一种快速比色法，使用2-巯基-6-硝基苯并噻唑（Au NPs-MNBT）修饰的金纳米颗粒检测溴氰菊酯：溴氰菊酯附着在Au NPs-MNBT的表面和核-壳结构上以Au NPs-MNBT为核，溴氰菊酯为壳形成。核-壳结构的形成引起溶液颜色和金纳米颗粒的紫外可见吸收光谱的变化，可用于肉眼和使用紫外可见分光光度计定量检测溴氰菊酯。详细研究了MNBT含量，检测pH和反应时间对溴氰菊酯检测的影响，并测试了探针的选择性和抗干扰能力。结果表明，该探针可用于快速，准确地从13种其他农药中检测溴氰菊酯。与溴氰菊酯共存的其他农药浓度是其五倍时，溴氰菊酯的检测不受影响。肉眼观察到溴氰菊酯的检出限为0.25μM，通过UV-Vis光谱法观察为0.005μM。用小番茄和樱桃的提取液评价了该检测方法在实际样品中的可行性，其结果与气相色谱-质谱法相吻合，证明了所开发的方法在溴氰菊酯检测中具有实际的样品应用潜力。肉眼观察到溴氰菊酯的检出限为0.25μM，通过UV-Vis光谱法观察为0.005μM。用小番茄和樱桃的提取液评价了该检测方法在实际样品中的可行性，其结果与气相色谱-质谱法相吻合，证明了所开发的方法在溴氰菊酯检测中具有实际的样品应用潜力。肉眼观察到溴氰菊酯的检出限为0.25μM，通过UV-Vis光谱法观察为0.005μM。用小番茄和樱桃的提取液评价了该检测方法在实际样品中的可行性，其结果与气相色谱-质谱法相吻合，证明了所开发的方法在溴氰菊酯检测中具有实际的样品应用潜力。