Fully integrated rapid microfluidic device translated from conventional 96-well ELISA kit

Area of Science:

• Biomedical Engineering
• Analytical Chemistry
• Point-of-Care Diagnostics

Background:

• Conventional enzyme-linked immunosorbent assay (ELISA) requires large sample volumes and long incubation times, limiting its use in point-of-care settings.
• Traditional 96-well plate ELISA necessitates batch processing, hindering immediate patient-specific results.
• Existing methods face challenges in precise reagent control and minimizing assay duration.

Purpose of the Study:

• To develop an integrated active microfluidic device for point-of-care testing (POCT).
• To enhance the performance of enzyme-linked immunosorbent assay (ELISA) by individualizing 96-well functionality.
• To enable rapid, sensitive, and low-volume quantification of biomarkers.

Main Methods:

• Integration of a programmable, disposable on-chip pump and valve system into a microfluidic device.
• Precise control of microfluidic reagents, reaction time, and volume for optimized ELISA protocols.
• Application of the device for quantifying cardiac troponin I (cTnI) using minimal sample volume.

Main Results:

• Successful implementation of a microfluidic device enabling individualized 96-well ELISA operation.
• Achieved highly sensitive detection of cardiac troponin I (cTnI) at 4.88 pg/mL.
• Demonstrated reduced reagent consumption and significantly shortened assay time (15 min per step) compared to conventional methods.
• Obtained an improved limit of detection (LOD) over traditional 96-well platforms.

Conclusions:

• The developed microfluidic device effectively transforms conventional ELISA into a rapid POCT format.
• The device offers enhanced sensitivity, reduced reagent use, and faster assay times for biomarker quantification.
• This technology holds significant potential for improving diagnostic capabilities in point-of-care settings.