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Single Droplet Digital Polymerase Chain Reaction for Comprehensive and Simultaneous Detection of Mutations in Hotspot Regions
Published on: September 25, 2018
In-house validation of a droplet digital PCR system using a multifactorial experimental design
Christopher Weidner1, Sophia Edelmann1, Emilie Dagand2
1Department Method Standardisation, Reference Laboratories, Resistance to Antibiotics, Federal Office of Consumer Protection and Food Safety (BVL), P.O. Box 110260, 10832, Berlin, Germany.
Analytica Chimica Acta
|May 30, 2025
Summary
Digital PCR (dPCR) offers robust nucleic acid quantification for food safety. Validation using factorial design confirmed system accuracy, with master mix and droplet volume being critical factors.
Area of Science:
- Molecular Biology
- Analytical Chemistry
- Food Science
Background:
- Digital PCR (dPCR) is crucial for nucleic acid quantification.
- Applications in food and feed safety analysis are expanding.
- Method validation is required by international standards (e.g., ISO/IEC 17025).
Purpose of the Study:
- Develop and apply a validation and statistical modeling approach for dPCR systems.
- Assess the Bio-Rad QX200 Droplet dPCR (ddPCR) system.
- Ensure accurate quantification for food and feed safety applications.
Main Methods:
- Factorial experimental design for dPCR validation.
- Statistical modeling based on the Poisson process.
- Application to the Bio-Rad QX200 ddPCR system.
Main Results:
- Most tested factors (operator, primers, enzymes) did not affect DNA quantification, showing system robustness.
- ddPCR master mix and droplet volume significantly impact DNA copy concentration accuracy.
- The "Supermix for Probes (no dUTP)" confirmed system accuracy across the working range.
Conclusions:
- The Bio-Rad QX200 ddPCR system demonstrates high precision, sensitivity, uniformity, and robustness.
- Procedures to enhance droplet stabilization improve statistical analysis acceptance.
- The developed validation and modeling concept is adaptable to other digital PCR technologies.
