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Tuning Biosensor Cross-Reactivity Using Aptamer Mixtures.

Yingzhu Liu1, Haixiang Yu1, Obtin Alkhamis1

  • 1Department of Chemistry and Biochemistry, Florida International University, 11200 SW Eighth Street, Miami, Florida 33199, United States.

Analytical Chemistry
|March 18, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel aptamer mixture strategy to precisely control biosensor cross-reactivity for detecting synthetic cathinones. This method enhances specificity against interferents, offering a versatile platform for various diagnostic and monitoring applications.

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Area of Science:

  • Biotechnology and Biosensor Engineering
  • Molecular Recognition and Aptamer Technology
  • Analytical Chemistry and Chemical Sensing

Background:

  • Tuning biosensor cross-reactivity for specific ligand families while maintaining specificity against interferents is challenging due to limitations in suitable bioreceptors.
  • Existing aptamer engineering techniques like sequence mutation or truncation offer limited control over biosensor responsiveness.

Purpose of the Study:

  • To present a novel strategy for controlling biosensor cross-reactivity using defined mixtures of aptamers with distinct binding properties.
  • To demonstrate the application of this strategy for the specific detection of synthetic cathinones with customized responses to target ligands and interferents.

Main Methods:

  • Employed dual-aptamer mixtures in colorimetric dye-displacement assays to tune binding spectra by altering aptamer molar ratios.
  • Validated the strategy using a dual-aptamer electrochemical sensor to demonstrate generality.
  • Utilized high-throughput sequencing to identify multiple aptamers for target families.

Main Results:

  • Optimized dual-aptamer assays achieved broad detection of synthetic cathinones with significantly reduced response to interferents.
  • The developed assays exhibited superior sensing performance compared to those using individual aptamers.
  • Demonstrated precise customization of biosensor responsiveness, surpassing previous aptamer engineering methods.

Conclusions:

  • The aptamer mixture strategy offers a generally applicable method for generating highly specific and customizable aptamer biosensors.
  • This approach significantly advances the engineering of aptamer-based biosensors for diverse applications, including medical diagnostics, environmental monitoring, and drug detection.