Customizable Nichrome Wire Heaters for Molecular Diagnostic Applications.
Juhee Lim1, Won Han1, Le Tran Huy Thang1
1Industry 4.0 Convergence Bionics Engineering, Pukyong National University, Busan 48513, Republic of Korea.
Biosensors
|March 27, 2024
Summary
This study presents a novel, cost-effective method for creating custom heaters using nichrome wire for point-of-care testing (POCT). This technique enables portable nucleic acid detection devices for applications like pathogen identification.
Area of Science:
- Biomedical Engineering
- Molecular Diagnostics
- Materials Science
Background:
- Accurate sample heating is crucial for nucleic acid extraction and amplification in molecular detection.
- Traditional thermal cycling systems are bulky, expensive, and lab-bound, limiting their use in point-of-care settings.
- There is a need for portable, cost-effective heating solutions for molecular diagnostics outside traditional laboratory environments.
Purpose of the Study:
- To introduce a versatile and customizable heating technique for point-of-care molecular diagnostics.
- To demonstrate the fabrication of tailored heaters using patterned nichrome wire on carbon black-polydimethylsiloxane (PDMS) casts.
- To validate the applicability of these custom heaters for nucleic acid amplification techniques in portable devices.
Main Methods:
- Developed a fabrication method for custom heaters by arranging protrusions on a PDMS cast and patterning nichrome (NiCr) wire.
- Created a 2D heater with three temperature zones for a portable polymerase chain reaction (PCR) device.
- Designed and tested a 3D heater for loop-mediated isothermal amplification (LAMP) in a microtube format.
- Utilized cost-effective and shape-unconstrained materials for heater fabrication.
Main Results:
- Successfully fabricated both 2D and 3D customized heaters with precise temperature control.
- Demonstrated the utility of a 2D heater for portable thermocycling in detecting *Escherichia coli* (E. coli) O157:H7 DNA via PCR.
- Showcased the effectiveness of a 3D heater for pathogen DNA detection using loop-mediated isothermal amplification (LAMP).
Conclusions:
- The proposed nichrome wire patterning technique offers a cost-effective and versatile solution for creating custom heaters.
- This heating method is suitable for point-of-care testing (POCT) applications, enabling portable molecular diagnostics.
- The successful DNA amplification demonstrates the potential of this technique for rapid pathogen detection in diverse settings.
