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Related Concept Videos

Real Time RT-PCR02:57

Real Time RT-PCR

Real-time reverse transcription-polymerase chain reaction, or Real-time RT-PCR, is an analytical tool used to determine the expression level of target genes. The method involves converting mRNA to complementary DNA with the help of an enzyme known as reverse transcriptase, followed by the PCR amplification of the cDNA. These two processes can be performed simultaneously in a single tube or separately as a two-step reaction.
The real-time quantification of the number of amplified products is...

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A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis
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A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis

Published on: September 10, 2014

Electrochemistry-based real-time PCR on a microchip.

Stephen S W Yeung1, Thomas M H Lee, I-Ming Hsing

  • 1Department of Chemical Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.

Analytical Chemistry
|December 20, 2007
PubMed
Summary
This summary is machine-generated.

This study introduces an electrochemical real-time polymerase chain reaction (ERT-PCR) on a microchip for rapid DNA analysis. The novel method offers faster detection compared to traditional techniques, promising for point-of-care diagnostics.

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Microfluidic Chip Fabrication and Method to Detect Influenza
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Area of Science:

  • Biotechnology
  • Analytical Chemistry
  • Microfluidics

Background:

  • Point-of-care diagnostics require rapid and portable DNA analysis tools.
  • Existing methods like fluorescence-based PCR can be time-consuming and require specialized equipment.
  • Decentralized applications in medical diagnostics and environmental monitoring necessitate innovative detection platforms.

Purpose of the Study:

  • To implement and optimize an electrochemical real-time polymerase chain reaction (ERT-PCR) on a silicon-glass microchip.
  • To enable simultaneous DNA amplification and electrochemical detection in a single device.
  • To evaluate the performance of the on-chip ERT-PCR system for rapid DNA analysis.

Main Methods:

  • Development of an on-chip ERT-PCR technique integrating oligonucleotide extension and electrochemical signal measurement.
  • Investigation of critical parameters including surface passivation and electrochemical scanning of electrodes.
  • Optimization of immobilized probe and polymerase concentrations for enhanced signal detection.

Main Results:

  • The on-chip ERT-PCR achieved a significantly lower onset thermal cycle (3-5) compared to fluorescence-based methods for high DNA concentrations.
  • Successful simultaneous amplification and electrochemical detection of DNA were demonstrated on the microchip.
  • Controlled reagent concentrations improved signal meaningfulness at lower initial template DNA concentrations.

Conclusions:

  • The developed ERT-PCR microchip platform facilitates rapid, simultaneous DNA amplification and detection.
  • This technology shows significant promise for advancing point-of-care testing and decentralized DNA analysis.
  • Further optimization can enhance sensitivity for a wider range of DNA concentrations.