Biomarker Analysis on a Power-free Microfluidic Chip Driven by Degassed Poly(dimethylsiloxane)

Area of Science:

• Biomarker analysis
• Microfluidic chip technology
• Medical engineering

Background:

• Point-of-care testing (POCT) is crucial for early disease diagnosis, but microfluidic chips require external pumps and valves.
• A power-free microfluidic pumping method using degassed poly(dimethylsiloxane) (PDMS) was developed to overcome these limitations.

Purpose of the Study:

• To describe the working principle of degas-driven power-free microfluidic chips.
• To review applications of these chips for biomarker analysis.
• To highlight advancements in sensitivity for protein and nucleic acid detection.

Main Methods:

• Utilized degas-driven power-free microfluidic chips for biomarker analysis.
• Employed sandwich immunoassay for protein analysis and sandwich hybridization for nucleic acid analysis.
• Implemented laminar flow-assisted dendritic amplification (LFDA) to enhance detection sensitivity.

Main Results:

• Achieved biomarker analysis with small sample volumes (∼1 μL) and short analysis times (∼20 min).
• LFDA improved the limit of detection (LOD) by three orders of magnitude for both proteins and nucleic acids.
• Typical LOD values for proteins and nucleic acids were reduced to around 1 pM using LFDA.

Conclusions:

• Degas-driven microfluidic chips provide a promising platform for power-free POCT.
• LFDA significantly enhances the sensitivity of biomarker detection on microfluidic chips.
• This technology facilitates early diagnosis of diseases like cancer through rapid and sensitive biomarker analysis.