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Related Experiment Videos

Quartz crystal microbalance (QCM) affinity biosensor for genetically modified organisms (GMOs) detection.

Ilaria Mannelli1, Maria Minunni, Sara Tombelli

  • 1Dipartimento di Chimica, Università degli Studi di Firenze, Polo Scientifico-Via della Lastruccia 3, Sesto Fiorentino-Florence 50019, Italy.

Biosensors & Bioelectronics
|December 18, 2002
PubMed
Summary

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A new DNA piezoelectric sensor detects genetically modified organisms (GMOs) using DNA hybridization on a quartz crystal microbalance (QCM). This method offers sensitive and specific GMO detection for food screening.

Area of Science:

  • Biosensors
  • Molecular Biology
  • Analytical Chemistry

Background:

  • Genetically modified organisms (GMOs) require reliable detection methods.
  • Existing GMO detection techniques can be complex and time-consuming.
  • DNA-based detection offers specificity for identifying genetic modifications.

Purpose of the Study:

  • To develop and optimize a DNA piezoelectric sensor for GMO detection.
  • To evaluate different probe immobilization strategies for enhanced sensitivity and specificity.
  • To assess the sensor's performance with various DNA samples, including real-world food samples.

Main Methods:

  • Immobilization of single-stranded DNA (ssDNA) probes onto a quartz crystal microbalance (QCM) sensor.
  • Monitoring DNA hybridization between immobilized probes and target DNA sequences (35S promoter and Nos terminator).

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  • Optimization using synthetic oligonucleotides and validation with plasmid DNA, certified reference materials (CRM), and PCR-amplified samples.

    • Main Results:

    • Both thiol-dextran and thiol-derivatised probe immobilization methods enabled sensitive GMO detection.
    • The DNA piezoelectric sensor demonstrated specificity for target GMO sequences.
    • Analytical parameters such as sensitivity, reproducibility, and lifetime were investigated and found suitable for screening.

    Conclusions:

    • The developed DNA piezoelectric sensor is a sensitive and specific tool for GMO detection.
    • The sensor provides a valuable method for screening food samples for the presence of GMOs.
    • This technology can contribute to improved food safety and regulatory compliance.