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DNA Nanostructure-Based Magnetic Beads for Potentiometric Aptasensing.

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  • 1Key Laboratory of Coastal Environmental Processes and Ecological Remediation and Shandong Provincial Key Laboratory of Coastal Environmental Processes, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Yantai, Shandong 264003, P. R. China.

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|June 6, 2015
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Summary

This study introduces a novel potentiometric sensing platform for detecting any charged molecule. DNA nanostructures on magnetic beads change surface charge upon target binding, enabling sensitive detection of endocrine disruptors like bisphenol A.

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Area of Science:

  • Analytical Chemistry
  • Nanotechnology
  • Biosensing

Background:

  • Potentiometric sensing offers a sensitive detection method but is limited by analyte charge.
  • Developing a universal platform for detecting diverse molecules, regardless of charge, is crucial.
  • DNA nanostructures provide a versatile tool for molecular recognition and signal transduction.

Purpose of the Study:

  • To develop a simple, general, and sensitive potentiometric sensing platform applicable to any molecule class.
  • To utilize DNA nanostructures and magnetic beads for signal amplification and easy separation.
  • To demonstrate the platform's efficacy using an endocrine disruptor, bisphenol A, as a model analyte.

Main Methods:

  • Self-assembly of DNA nanostructures on magnetic beads via aptamer incorporation and hybridization chain reaction.
  • Induction of DNA nanostructure disassembly upon target analyte binding, altering magnetic bead surface charge.
  • Detection of surface charge changes using a polycation-sensitive membrane electrode with protamine as an indicator.

Main Results:

  • The proposed potentiometric method demonstrated high sensitivity for bisphenol A detection.
  • A wide linear range of 0.1 to 100 nM and a low detection limit of 80 pM (3σ) were achieved.
  • The sensing strategy proved effective for detecting an endocrine disruptor.

Conclusions:

  • A versatile and sensitive potentiometric sensing platform based on DNA nanostructures has been successfully developed.
  • This strategy enables the detection of various targets irrespective of their charge.
  • The platform lays the foundation for developing advanced potentiometric sensors for highly sensitive and selective analyte detection.