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Related Concept Videos

Microbial Biosensors01:17

Microbial Biosensors

Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...

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Updated: Jul 1, 2026

Attaching Biological Probes to Silica Optical Biosensors Using Silane Coupling Agents
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Beyond the 2D Plane: Interfacing Microwave Resonators with Bioreceptor-Functionalized Hydrogel Micropillars for

Ghanimah N Abuhaimed1, Haoliang Lu1, Apala Banerjee2

  • 1BioMAD Lab, Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia.

ACS Applied Materials & Interfaces
|June 29, 2026
PubMed
Summary

A novel microwave biosensor using hydrogel micropillars enables sensitive, label-free detection of microRNAs for precision healthcare. This enzyme-free approach improves detection limits by 20-fold, offering a reusable and reproducible platform.

Keywords:
hydrogelslabel-free sensingmicroRNAmicrowave biosensorspeptide nucleic acidsreusable biosensorsplit ring resonators

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Area of Science:

  • Biomedical Engineering
  • Biosensing Technology
  • Nanotechnology

Background:

  • Conventional microRNA detection methods are often costly, time-consuming, and labor-intensive due to enzyme- or label-based workflows.
  • Microwave biosensors, specifically split-ring resonators (SRRs), offer label-free, noncontact detection but traditionally lack sufficient sensitivity for clinical applications.
  • Existing biosensor platforms often utilize planar interfaces, limiting probe loading and volumetric interaction.

Purpose of the Study:

  • To develop a highly sensitive, enzyme-free, and label-free microwave biosensing platform for detecting liquid biopsy biomarkers like microRNAs.
  • To enhance the sensitivity and efficiency of split-ring resonator (SRR) biosensors by integrating them with microfluidic channels and hydrogel micropillars.
  • To demonstrate a novel three-dimensional biosensing strategy for improved biomarker quantification in precision healthcare.

Main Methods:

  • Integration of SRRs with microfluidic channels containing bioreceptor-functionalized hydrogel micropillars for localized target hybridization.
  • Utilizing peptide nucleic acid (PNA) probes for stable and high-affinity binding to the target microRNA (miR-16-5p).
  • Measuring concentration-dependent shifts in the resonant frequency of the SRR capacitive gap, induced by changes in complex permittivity within the hydrogel.

Main Results:

  • Achieved approximately a 20-fold improvement in detection limit compared to conventional planar systems, reaching subnanomolar sensitivity.
  • Demonstrated label-free, enzyme-free detection of the cancer-associated biomarker miR-16-5p with single-nucleotide specificity.
  • Hydrogel micropillars enhanced probe loading and volumetric electromagnetic interaction, leading to superior performance and device reproducibility.

Conclusions:

  • The developed hydrogel-interfaced SRR biosensor represents a significant advancement in sensitive, selective, and label-free microRNA detection.
  • This 3D microwave biosensing strategy offers a generalizable platform for next-generation biosensors applicable to precision healthcare.
  • The enzyme-free, label-free, and reusable nature of the biosensor addresses limitations of current detection methods, paving the way for clinical utility.