Highly sensitive detection of 2,4,6-trinitrotoluene(TNT) using poly(vinylamine-co-N-vinylformamide)based surface plasmon resonance (SPR) immunosensor

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Abstract

In this paper, we describe the fabrication of a novel poly-(vinylamine-co- Nvinylformamide) (poly-(VAm-co-NVF))-based surface plasmon resonance (SPR) sensor chip supported by a self-assembled monolayer (SAM) of alkanethiol and its use in the highly sensitive detection of 2,4,6-trinitrotoluene (TNT), which is a typical explosive. 2,4-dinitrophenyl-glycine (DNP-GIy) was immobilized to amino groups on the side chain of poly-vinylamine (poly-VAm) on the sensor surface. The fabricated surface showed a high response for flow of anti-TNT antibodies. However, it was found that the response included the nonspecific adsorption of anti-TNT antibodies, because unreacted amino groups of the poly-VAm were positively charged and it caused nonspecific adsorption due to electrostatic interaction. Then, the number of amino groups was reduced by making low-hydrolyzed poly-N-vinylformamideipoly-NVF), i.e., poly(VAm-co-NVF) -poly-NVF is a precursor of poly-VAm, and nonspecific adsorption was controlled. The limit of detection (LOD) of TNT was 28 ppt using the sensor chip fabricated with 23% hydrolyzed poly-(VAm-co-NVF) by inhibition assay.

Original languageEnglish
Pages (from-to)45-56
Number of pages12
JournalSensors and Materials
Volume25
Issue number1
Publication statusPublished - 2013

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All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Materials Science(all)

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