Handheld Purification-Free Nucleic Acid Testing Device for Point-of-Need Detection of Malaria from Whole Blood

Area of Science:

• Biomedical Engineering
• Molecular Diagnostics
• Parasitology

Background:

• The World Health Organization aims to eliminate malaria in resource-limited economies.
• Effective malaria control requires accessible, low-cost, sensitive, and specific screening tools.

Purpose of the Study:

• To present a feasibility study of a handheld nucleic acid testing device for malaria detection.
• To enable on-chip automated sample preparation for Plasmodium falciparum detection.

Main Methods:

• A piezo pump pressure-driven microfluidic cartridge was developed for sample preparation.
• A purification-free protocol using two reagents was employed for whole blood sample preparation.
• Loop-mediated isothermal amplification (LAMP) was used to detect parasite genomic DNA, with fluorescence monitoring for real-time quantification.

Main Results:

• The device achieved a sensitivity of approximately 0.42 parasite/μL of whole blood.
• This sensitivity is sufficient for detecting asymptomatic malaria parasite carriers.
• The system integrates sample preparation and nucleic acid amplification on a single microfluidic cartridge.

Conclusions:

• The developed handheld device demonstrates feasibility for sensitive malaria detection.
• The on-chip automated sample preparation simplifies the testing process.
• This technology has the potential to improve malaria screening accessibility in resource-limited settings.