4.7 Article

An enzyme-free electrochemical biosensor based on target-catalytic hairpin assembly and Pd@UiO-66 for the ultrasensitive detection of microRNA-21

Journal

ANALYTICA CHIMICA ACTA
Volume 1138, Issue -, Pages 59-68

Publisher

ELSEVIER
DOI: 10.1016/j.aca.2020.09.022

Keywords

MicroRNA-21; Electrochemical biosensor; Pd@metal-organic frameworks; Catalytic hairpin assembly

Funding

  1. Priority Strategy Project of Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of Ministry of Education [ts2019003]
  2. Natural Science Foundation of Hebei Province [B2019201407, B2018201214]
  3. Science and Technology Research Project of Higher Education Institutions in Hebei Province [QN2020153]
  4. Advanced Talents Incubation Program of the Hebei University [801260201026]

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MicroRNA-21 (miR-21) has been widely investigated as important biomarkers for cancer diagnosis and treatment. Herein, a highly sensitive nonenzymatic electrochemical biosensor based on Pd@metal-organic frameworks (Pd@UiO-6 6) and target-catalytic hairpin assembly (CHA) with target recycling approach has been proposed for the detection of miR-21. The proposed biosensor integrates the efficient CHA strategy and excellent electrocatalytic performance of Pd@UiO-6 6 nanocomposites. The concentration of miRNA-21 is related to the amount of the adsorbed electrocatalyst, leading to the different electrochemical signals for readout towards paracetamol (AP). This biosensor shows a low limit of detection of 0.713 fM with the dynamic range of 20 fM -600 pM under the optimal experimental conditions, providing a powerful platform for detecting miR-21. Furthermore, the designed biochemical self-assembly strategy of this electrochemical biosensor is promising candidate for potential applications in the analysis of other important genetic biomarkers for early diagnosis of cancers. (C) 2020 Elsevier B.V. All rights reserved.

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