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Summary
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An ice-confinement strategy enhances DNA assays by reprogramming interfacial mass transport. This method enables ultrasensitive microRNA detection, improving biosensing performance.

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Area of Science:

  • Biotechnology and Biosensing
  • Surface Chemistry and Nanotechnology

Background:

  • Diffusion-reaction coupling at solid-liquid interfaces limits molecular assay performance, especially for surface-based DNA assays.
  • Existing methods struggle with efficient mass transport and reaction control at interfaces.

Purpose of the Study:

  • To develop an ice-confinement strategy to reprogram mass transport at solid-liquid interfaces for enhanced molecular assays.
  • To achieve ultrasensitive detection of microRNA (miRNA) by optimizing interfacial reaction kinetics.

Main Methods:

  • Utilized directional freezing to create an ice-confined liquid layer at the solid-liquid interface.
  • Employed in situ electrochemistry and finite-element modeling to analyze DNA oligonucleotide behavior.
  • Integrated PEGylated passivation to modify the electrical double layer and enhance binding.

Main Results:

  • Directional freezing concentrated DNA oligonucleotides, shifting reactions from diffusion-controlled to surface-confined.
  • Ice confinement lowered interfacial energy barriers and enabled kinetic trapping of overequilibrium binding states.
  • Achieved ultrasensitive miRNA detection down to 100 aM within 30 minutes, with suppressed amplification leakage.

Conclusions:

  • The ice-confinement strategy effectively modulates interfacial kinetics through phase-transition-enabled physical confinement.
  • This approach significantly enhances biosensing capabilities, offering broad applicability across substrates and signal outputs.
  • The strategy holds promise for advancing surface engineering and molecular diagnostics.