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Digital Microfluidics for Automated Proteomic Processing
Published on: November 6, 2009
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A conjoint multi metal-ion iminodiacetic acid monolith microfluidic chip for structural-based protein
Ashish Khaparde1, S Lokesh Kumar1, M A Vijayalakshmi1
1Centre for Bioseparation Technology (CBST), Vellore Institute of Technology (VIT), Vellore, Tamil Nadu, 632014, India.
Electrophoresis
|October 23, 2021
Summary
This study presents a novel, reusable microfluidic chip for efficient protein pre-fractionation. The device successfully separates human plasma proteins with high recovery, demonstrating its potential in biochemical analysis.
Area of Science:
- Biotechnology
- Analytical Chemistry
- Materials Science
Background:
- Microfluidic devices offer miniaturized platforms for complex separation tasks.
- Developing cost-effective and efficient fabrication methods for microfluidic chips is crucial for broader adoption.
- Immobilization of specific ligands within microfluidic channels enables targeted analyte capture.
Purpose of the Study:
- To design and fabricate a polydimethylsiloxane (PDMS)-based multichannel microfluidic chip using a simple, accessible method.
- To immobilize iminodiacetic acid (IDA) onto microfluidic monoliths for metal ion chelation.
- To evaluate the chip's performance in pre-fractionating human plasma proteins based on surface topography.
Main Methods:
- Fabrication of a PDMS microfluidic chip via UV-initiated in situ polymerization of a methacrylate-based monomer mixture.
- Immobilization of iminodiacetic acid (IDA) on aldehyde-functionalized monoliths using Schiff base chemistry.
- Chelation of transition metal ions (Co(II), Zn(II), Ni(II), Cu(II)) onto IDA-functionalized microfluidic channels.
- Pre-fractionation of human plasma proteins (fibrinogen, immunoglobulin, transferrin, human serum albumin) using the affinity microfluidic chip.
Main Results:
- Successful fabrication of a PDMS microfluidic chip with integrated monoliths in under 40 minutes.
- Confirmation of iminodiacetic acid immobilization via FT-IR spectroscopy.
- Demonstration of high chip permeability (9.40 × 10⁻¹³ m²) and porosity (32.8%).
- Effective pre-fractionation of four human plasma proteins with approximately 95% recovery.
- Reusability of the multimonolith microchip for at least three adsorption-desorption cycles.
Conclusions:
- A simple and rapid fabrication method for PDMS-based microfluidic chips was established.
- The developed affinity microfluidic chip demonstrates efficient pre-fractionation of plasma proteins.
- The chip's reusability and high protein recovery highlight its potential for analytical and diagnostic applications.
