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首页> 外文期刊>Biosensors & Bioelectronics: The International Journal for the Professional Involved with Research, Technology and Applications of Biosensers and Related Devices >Rapid and sensitive in-situ detection of polar antibiotics in water using a disposable Ag-graphene sensor based on electrophoretic preconcentration and surface-enhanced Raman spectroscopy
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Rapid and sensitive in-situ detection of polar antibiotics in water using a disposable Ag-graphene sensor based on electrophoretic preconcentration and surface-enhanced Raman spectroscopy

机译：使用基于电泳预浓缩和表面增强拉曼光谱的一次性Ag-石墨烯传感器快速灵敏地原位检测水中的极性抗生素

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摘要

A disposable Ag-graphene sensor was developed for rapid and sensitive in-situ detection of polar antibiotics in water using electrophoretic preconcentration (EP) and surface-enhanced Raman spectroscopy (SERS). The Ag-graphene sensor was fabricated by depositing Ag-graphene nanocomposites synthesized through a facile one-pot method on the disposable screen-printed electrodes (SPEs) and characterized by transmission electron microscopy (TEM) and atomic force microscopy (AFM). SERS properties and detection applicability of the developed sensor were systematically investigated. It is shown that the polar antibiotics can be selectively adsorbed on the oppositely charged sensors after applying different potentials during the EP procedure, and the SERS signals of antibiotics with an effective amplification can be achieved with proper time of preconcentration. Moreover, the Ag-graphene sensor could facilitate the molecule adsorption through weak π-π interactions between graphene and antibiotics, further improving the sensitivity of SERS detection. Under the optimum EP conditions, the representative SERS spectra of a mixed solution containing four different antibiotics can be obtained within 10. min, and each antibiotic is easily distinguished by its characteristic peaks with a sub-nM detection level. The results demonstrate that the proposed disposable Ag-graphene sensor based on EP-SERS can be used for rapid and sensitive in-situ detection of polar antibiotics in aqueous samples without a pre-separation step.
机译：开发了一种一次性使用的Ag-石墨烯传感器，可使用电泳预浓缩（EP）和表面增强拉曼光谱（SERS）快速灵敏地原位检测水中的极性抗生素。通过将通过简便的一锅法合成的Ag-石墨烯纳米复合材料沉积在一次性丝网印刷电极（SPEs）上，并通过透射电子显微镜（TEM）和原子力显微镜（AFM）对其进行表征，从而制造出Ag-石墨烯传感器。系统地研究了开发的传感器的SERS特性和检测适用性。结果表明，在EP程序中施加不同的电位后，极性抗生素可以选择性地吸附在带相反电荷的传感器上，并且可以在适当的预浓缩时间下获得具有有效放大作用的抗生素的SERS信号。此外，Ag-石墨烯传感器可通过石墨烯与抗生素之间的弱π-π相互作用促进分子吸附，从而进一步提高SERS检测的灵敏度。在最佳EP条件下，可以在10分钟内获得包含四种不同抗生素的混合溶液的代表性SERS光谱，并且每种抗生素都可以通过其特征峰（亚nM检测水平）轻松区分。结果表明，提出的基于EP-SERS的一次性Ag-石墨烯传感器可用于快速，灵敏的原位检测水性样品中的极性抗生素而无需预先分离的步骤。

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