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DNA isolation protocols can be fast and straightforward or complex and time-consuming depending on the type and quality of DNA required for further processing. For example, plasmid DNA extraction is a bit more complicated than genomic DNA extraction because of the need for an appropriate lysis method to separate plasmid DNA from gDNA during isolation. However, for specific applications, such as long-range DNA sequencing that require a good yield of high- quality DNA samples, we need to follow...
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Fast and robust sample self-digitization for digital PCR.

Xu Cui1, Lei Wu2, Yin Wu1

  • 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
|March 24, 2020
PubMed
Summary
This summary is machine-generated.

A novel self-digitization (SD) chip enables rapid, low-cost digital PCR (dPCR) by quickly partitioning samples into many compartments. This microfluidic method efficiently digitizes over 90% of sample volume for sensitive molecular assays.

Keywords:
Detachable PDMS coverDigital PCRHigh-density microwellsLow wasteSelf-digitization

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Area of Science:

  • Biotechnology
  • Microfluidics
  • Molecular Diagnostics

Background:

  • Digital PCR (dPCR) offers high sensitivity but often requires complex, time-consuming sample preparation.
  • Existing microfluidic methods for dPCR sample partitioning can be slow and may not efficiently utilize the entire sample volume.

Purpose of the Study:

  • To develop a facile, rapid, and low-cost sample partitioning method for digital PCR (dPCR) assays.
  • To create a microfluidic device capable of high-order sample discretization with minimal sample waste.

Main Methods:

  • A self-digitization (SD) chip with parallel microfluidic channels and cylindrical wells was designed.
  • A detachable, degassed PDMS slab was used as a vacuum source for automated sample partitioning.
  • Sample digitization was achieved via air flushing, followed by oil sealing, avoiding lengthy oil flushing steps.

Main Results:

  • The SD chip achieved rapid sample discretization in minutes, partitioning over 90% of the sample volume.
  • The method generated large arrays of small, equal-volume sample compartments without external pumps or valves.
  • The utility of the SD chip was successfully demonstrated in a digital PCR assay.

Conclusions:

  • The developed SD chip provides a fast, efficient, and low-waste solution for sample partitioning in dPCR.
  • This method simplifies dPCR workflows and is particularly beneficial for applications with limited sample material.
  • The self-contained vacuum system and rapid sealing process offer significant advantages over conventional microfluidic techniques.