SERS-based sandwich bioassay protocol of miRNA-21 using Au@Ag core-shell nanoparticles and a Ag/TiO2 nanowires substrate

Le Peng, Jun Zhou, Zhaoheng Liang, Yaping Zhang, Lucia Petti, Tao Jiang, Chenjie Gu, Danting Yang, Pasqule Mormile

Research output: Journal PublicationArticlepeer-review

10 Citations (Scopus)

Abstract

Based on surface-enhanced Raman scattering (SERS) technology, Au@Ag@4MBA@5′-NH2-ssDNA probes and a Ag/TiO2@3′-NH2-ssDNA substrate were prepared and constructed into a sandwich structure to develop a high sensitivity bioassay of miRNA-21. The Au@Ag@4MBA@5′-NH2-ssDNA probes were prepared by immobilizing 5′-NH2-ssDNA onto the surfaces of 4MBA-labelled Au@Ag core-shell nanoparticles, and the Ag/TiO2@3′-NH2-ssDNA substrate was prepared by immobilizing 3′-NH2-ssDNA on the surface of Ag/TiO2 nanowires SERS-active substrates. The experimental results showed that the SERS-based sandwich bioassay of miRNA-21 presented a low limit of detection of 0.75 fM and a broad dynamic range from 1.0 fM to 1.0 nM. Also, the test data for the SERS-based sandwich bioassay were not only consistent with that of the real-time fluorescence quantitative polynucleotide chain reaction (RT-qPCR) method but also displayed higher detection sensitivity. It was shown that the SERS-based sandwich bioassay of miRNA-21 has importance for use in potential applications involving diagnosing clinical cancer patients.

Original languageEnglish
Pages (from-to)2960-2968
Number of pages9
JournalAnalytical Methods
Volume11
Issue number23
DOIs
Publication statusPublished - 21 Jun 2019

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering (all)
  • Engineering (all)

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