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SPEED: an integrated, smartphone-operated, handheld digital PCR Device for point-of-care testing
Haoqing Zhang1,2,3, Xiaocheng Liu1, Xinlu Wang1
1Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospace; School of Mechanical Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an, Shaanxi 710072 PR China.
Microsystems & Nanoengineering
|May 21, 2024
Summary
This study details SPEED, a smartphone-based digital polymerase chain reaction (dPCR) device. The validated design offers a portable and efficient platform for various deoxyribonucleic acid analyses.
Area of Science:
- Biotechnology
- Molecular Biology
- Medical Devices
Background:
- Digital polymerase chain reaction (dPCR) offers high sensitivity and precision for nucleic acid quantification.
- Existing dPCR platforms can be bulky and expensive, limiting accessibility.
- Smartphone-based solutions present an opportunity for portable and cost-effective dPCR.
Purpose of the Study:
- To elaborate on the design, fabrication, and data analysis of the SPEED smartphone-based dPCR device.
- To present the technical specifications and operational principles of the SPEED system.
- To validate the performance of the SPEED device for deoxyribonucleic acid target detection.
Main Methods:
- Fabrication of dPCR chips on silicon substrates with partition diameters from 50 μm to 5 μm, organized into six blocks.
- Implementation of a temperature control system using a high-power density Peltier element and optimized PCR protocols.
- Development of an optical system with LED light sources, filters, and mirrors, coupled with an advanced image processing algorithm for data analysis.
Main Results:
- Successful fabrication of dPCR chips with varying partition sizes on a silicon substrate.
- Demonstration of efficient thermal cycling and optical signal management within the device.
- Validation of the SPEED device using various deoxyribonucleic acid targets, confirming its analytical capabilities.
Conclusions:
- The SPEED device represents a viable smartphone-based dPCR platform.
- The design and fabrication details provide a foundation for further development and application.
- The validated performance indicates broad applicability across multiple scientific and diagnostic fields.
