一种新的用于痕量草甘膦的双识别和双功能纳米表面适配体分子印迹聚合物探针,具有 SERS/RRS/Abs 三模技术。

A new di-recognition and di-functional nanosurface aptamer molecularly imprinted polymer probe for trace glyphosate with SERS/RRS/Abs trimode technique.

机构信息

School of Public Health, Guilin Medical University, Guilin, 541199, China; Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin, 541006, China.

School of Public Health, Guilin Medical University, Guilin, 541199, China; Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin, 541006, China.

出版信息

Biosens Bioelectron. 2024 Oct 1;261:116487. doi: 10.1016/j.bios.2024.116487. Epub 2024 Jun 10.

Abstract

A new di-recognition nitrogen-doped carbon dot nanosurface aptamer molecularly imprinted polymer (CD@MIPApt) nanocatalytic di-functional probe was prepared by microwave irradiation. The probe was utilized nitrogen-doped silver carbon dots (CD) as the matrix, glyphosate (Gly) as the template molecule, α-methyl acrylate as the monomer, ethylene glycol dimethacrylate as the cross-linker, and aptamer as the biorecognition element. It could not only recognize Gly but also exhibits catalytic amplification function. It was found that CD@MIPApt catalyzed the redox reaction of polyethylene glycol 400 (PEG400)-AgNO to generate silver nanoparticles (AgNPs). The AgNPs indicator component exhibit the effects of surface-enhanced Raman scattering (SERS), resonance Rayleigh scattering (RRS) and surface plasmon resonance absorption (Abs). In the presence of Gly, it binds to the surface imprinted site of CD@MIPApt, to reduce AgNPs generation due to the catalytic activity of CD@MIPApt decreasing. Thus, the SERS/RRS/Abs signal values decreased linearly. The linear ranges of SERS/RRS/Abs assay were 0.1-2.5 nM, 0.25-2.75 nM and 0.5-5 nM respectively. The detection limits were 0.034 nM, 0.071 nM and 0.18 nM Gly.

摘要

一种新型的直接识别氮掺杂碳点纳米表面适体分子印迹聚合物(CD@MIPApt)纳米催化双功能探针,通过微波辐射制备。该探针以氮掺杂银碳点(CD)为基质,草甘膦(Gly)为模板分子,α-甲基丙烯酸酯为单体,乙二醇二甲基丙烯酸酯为交联剂,适体作为生物识别元件。它不仅可以识别 Gly,还具有催化放大功能。研究发现,CD@MIPApt 可以催化聚乙二醇 400(PEG400)-AgNO 的氧化还原反应,生成银纳米粒子(AgNPs)。AgNPs 指示剂成分表现出表面增强拉曼散射(SERS)、共振瑞利散射(RRS)和表面等离子体共振吸收(Abs)的效应。在 Gly 存在的情况下,它与 CD@MIPApt 的表面印迹位点结合,由于 CD@MIPApt 的催化活性降低,AgNPs 的生成减少。因此,SERS/RRS/Abs 信号值呈线性降低。SERS/RRS/Abs 测定的线性范围分别为 0.1-2.5 nM、0.25-2.75 nM 和 0.5-5 nM。检测限分别为 0.034 nM、0.071 nM 和 0.18 nM Gly。

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