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Related Experiment Video

Updated: Jan 28, 2026

Detection of a CDH1 Rare Transcript Variant in Fresh-frozen Gastric Cancer Tissues by Chip-based Digital PCR
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A self-digitization chip integrated with hydration layer for low-cost and robust digital PCR.

Yongfeng Ning1, Xu Cui1, Chao Yang1

  • 1Key Laboratory of Optoelectronic Technology and Systems, Ministry of Education, Defense Key Disciplines Lab of Novel Micro-Nano Devices and System Technology, Chongqing University, Chongqing, 400044, China.

Analytica Chimica Acta
|February 21, 2019
PubMed
Summary

This study introduces a novel microfluidic digital PCR (dPCR) device for affordable and reliable nucleic acid quantification. The innovative design ensures zero water loss, enabling precise DNA detection in 10,000 picoliter reactors.

Keywords:
Digital polymerase chain reactionHydration reservoirMicrofluidicsSelf-digitizationVacuum accumulator

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Area of Science:

  • Biotechnology
  • Molecular Diagnostics
  • Microfluidics

Background:

  • Quantitative nucleic acid detection is crucial for molecular diagnostics.
  • Existing digital PCR (dPCR) platforms can be costly and complex.
  • Evaporation loss during thermal cycling affects assay accuracy.

Purpose of the Study:

  • To develop a low-cost, robust microfluidic digital PCR (dPCR) device.
  • To achieve zero-water-loss during dPCR thermal cycling.
  • To enable sensitive and accurate absolute quantification of nucleic acids.

Main Methods:

  • Integration of a vacuum accumulator and hydration reservoir using polydimethylsiloxane (PDMS) film.
  • Design of a microfluidic chip with 10,000 picoliter reaction chambers.
  • Utilizing PDMS permeability for vacuum energy storage and evaporation compensation.

Main Results:

  • The device achieved reliable single-DNA-molecule amplification and detection.
  • Zero-water-loss was confirmed across all reaction chambers during thermal cycling.
  • Accurate absolute quantification of T790M DNA (10-10^4 copies/μL) with a 10^4 dynamic range was demonstrated.

Conclusions:

  • The developed self-discretization dPCR chip offers a simple, robust, and cost-effective solution for quantitative nucleic acid assays.
  • The zero-water-loss feature enhances assay reliability and accuracy.
  • The device is suitable for low-cost molecular diagnostics in resource-limited settings.