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Related Experiment Video

Updated: Jan 31, 2026

A Loop-mediated Isothermal Amplification LAMP Assay for Rapid Identification of Bemisia tabaci
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LampPort: a handheld digital microfluidic device for loop-mediated isothermal amplification (LAMP).

Liang Wan1,2, Jie Gao1, Tianlan Chen1

  • 1State Key Laboratory of Analog and Mixed-Signal VLSI, University of Macau, Macao SAR, China.

Biomedical Microdevices
|January 9, 2019
PubMed
Summary
This summary is machine-generated.

We developed a handheld digital microfluidic device for DNA detection using loop-mediated isothermal amplification (LAMP). This portable system eliminates bulky optical equipment, enabling rapid, low-cost point-of-care disease diagnostics.

Keywords:
Digital microfluidic systemHandheld deviceLoop-mediated isothermal amplification (LAMP)Naked-eye visualisation

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Area of Science:

  • Biomedical Engineering
  • Molecular Diagnostics
  • Microfluidics

Background:

  • Point-of-care (POC) diagnostics require portable devices for rapid disease pathogen detection.
  • Traditional nucleic acid amplification testing relies on bulky optical detection systems, hindering portability.
  • Digital microfluidic (DMF) technology offers potential for miniaturizing diagnostic platforms.

Purpose of the Study:

  • To develop a handheld, detection system-free digital microfluidic (DMF) device for DNA detection.
  • To integrate droplet manipulation and real-time temperature control into a portable platform.
  • To enable naked-eye detection of DNA amplification products, enhancing POC utility.

Main Methods:

  • Developed a handheld DMF device with integrated droplet manipulation and temperature control.
  • Utilized electrowetting forces for precise 2-μl sample loading on DMF chips, minimizing reagent use.
  • Incorporated loop-mediated isothermal amplification (LAMP) on-chip, followed by naked-eye detection using SYBR Green I.
  • Tested the device using the blood parasite Trypanosoma brucei as a model system.

Main Results:

  • The handheld DMF device demonstrated comparable performance to a commercial thermal cycler.
  • Achieved a detection limit of 40 copies per reaction for the target DNA.
  • The integrated system successfully enabled naked-eye detection of amplified DNA products.
  • The device design prevented aerosol contamination by containing reaction droplets.

Conclusions:

  • The developed low-cost, compact DMF device eliminates the need for bulky optical systems in DNA detection.
  • This system is well-suited for point-of-care (POC) testing, offering rapid and effective disease pathogen determination.
  • The handheld, automatic nature of the device enhances its applicability in resource-limited settings.