A Novel Solution-auto-introduction Electrophoresis Microchip Based on Capillary Force.

Area of Science:

• Analytical Chemistry
• Microfluidics
• Biotechnology

Background:

• Traditional electrophoresis microchips often require external connectors for buffer introduction, limiting portability.
• Improving the portability of microchip electrophoresis devices is crucial for field applications.

Purpose of the Study:

• To develop a novel, portable electrophoresis microchip with an integrated solution-auto-introduction system.
• To enhance microchip performance through surface modification and optimized buffer introduction.

Main Methods:

• Fabrication of electrophoresis microchips utilizing capillary force for buffer auto-introduction.
• Employment of poly(vinyl alcohol) (PVA)-sponge and nano-sponge as suction pumps.
• Surface modification of microchannels with PVA to improve buffer dynamics and detection.

Main Results:

• PVA coating doubled the running buffer introduction velocity in microchannels.
• PVA-coated microchips demonstrated a 20-40% improvement in detection result repeatability.
• PVA-coated microchips exhibited significantly lower signal noise compared to native microchips.

Conclusions:

• The developed solution-auto-introduction electrophoresis microchip successfully eliminates external connectors for buffer introduction.
• PVA surface modification enhances microchip electrophoresis performance, offering a new approach for portable detection instruments.