Nanoslit membrane-integrated fluidic chip for protein detection based on size-dependent particle trapping

Area of Science:

• Microfluidics and Nanotechnology
• Biomolecular Detection
• Particle Manipulation

Background:

• Accurate detection of micro-/nano-particles is crucial for biological and clinical applications.
• Existing methods often face challenges in sensitivity and specificity for small particle concentrations.
• Need for integrated systems capable of both particle concentration and sensitive detection.

Purpose of the Study:

• To fabricate and characterize a nanoslit membrane-integrated fluidic chip (Nanoslit-Chip).
• To demonstrate the chip's capability for size-selective trapping and concentration of micro-/nano-particles.
• To apply the Nanoslit-Chip for sensitive detection of biological molecules via particle aggregation.

Main Methods:

• Fabrication of a uniform nanoslit fluid channel array on a silicon dioxide membrane.
• Utilizing size-selective trapping to concentrate fluorescence-labeled particles.
• Demonstrating separation of particles with different sizes (1.8 μm vs. 450 nm).
• Applying target-induced particle aggregation for protein detection and quantification.

Main Results:

• Successful fabrication of the Nanoslit-Chip with uniform nanoslit arrays.
• Efficient concentration of micro-/nano-particles into a monolayer for enhanced fluorescence detection.
• Demonstrated size-selective separation of particles (1.8 μm from 450 nm).
• Achieved sensitive detection of proteins using the target-induced aggregation method.

Conclusions:

• The Nanoslit-Chip effectively traps and concentrates particles of desired sizes.
• The chip enables sensitive and quantitative detection of biological molecules.
• This technology holds significant potential for advanced biological and clinical diagnostic devices.