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Related Concept Videos

Labeling DNA Probes03:31

Labeling DNA Probes

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DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
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A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis
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Micro-capillary-based evanescent field biosensor for sensitive, label-free DNA detection.

Yun Liu, Shimeng Chen, Qiang Liu

    Optics Express
    |September 15, 2015
    PubMed
    Summary

    We developed a novel micro-capillary biosensor for sensitive, label-free DNA detection. This cost-effective device enables rapid, real-time analysis of specific DNA sequences at room temperature.

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    Area of Science:

    • Biomedical Engineering
    • Analytical Chemistry
    • Molecular Biology

    Background:

    • Accurate detection of specific DNA sequences is crucial for various scientific and diagnostic applications.
    • Existing methods for DNA analysis can be costly, time-consuming, and require complex laboratory setups.

    Purpose of the Study:

    • To develop and demonstrate a high-sensitivity, cost-effective biosensor for rapid, label-free detection of specific DNA sequences.
    • To enable real-time monitoring of DNA hybridization and mismatch detection using a single device.

    Main Methods:

    • Fabrication of a micro-capillary-based biosensor with functionalized ssDNA probe sequences on the tubing wall.
    • Utilizing evanescent field principles for label-free detection of DNA hybridization.
    • Monitoring real-time wavelength shift responses to hybridization events.

    Main Results:

    • Demonstrated label-free DNA detection and hybridization monitoring at room temperature.
    • Successfully performed analyte concentration measurement and nucleotide mismatch detection with the single device.
    • The biosensor exhibited high sensitivity for low-concentration analytes in micro-samples.

    Conclusions:

    • The micro-capillary evanescent field biosensor offers a cost-effective, rapid, and sensitive solution for DNA sequence analysis.
    • Its compact design and ease of use make it suitable for on-site, real-time detection in diverse fields.
    • The technology supports applications in life sciences, pharmaceutical chemistry, medical diagnostics, and criminal investigation.