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Mathematical and numerical model to study two-dimensional free flow isoelectric focusing
Kisoo Yoo1, Jaesool Shim2, Jin Liu1
1School of Mechanical and Materials Engineering, Washington State University , Pullman, Washington 99164-2920, USA.
Biomicrofluidics
|November 8, 2014
Summary
Free flow isoelectric focusing (FFIEF) enables continuous protein separation in microfluidic chips. A new channel design using cross-stream flow significantly enhances separation resolution for efficient bioprocessing.
Area of Science:
- Biotechnology
- Analytical Chemistry
- Microfluidics
Background:
- Conventional isoelectric focusing (IEF) faces limitations in sample extraction and continuous processing.
- Free flow isoelectric focusing (FFIEF) offers a solution by applying a flow field perpendicular to the electric field.
Purpose of the Study:
- To develop a mathematical model for FFIEF to optimize microfluidic chip design for continuous protein separation.
- To investigate the influence of electric and flow fields on protein separation efficiency.
Main Methods:
- A finite volume numerical scheme was implemented to simulate 2D FFIEF in a microfluidic chip.
- The model was validated against experimental pH gradients and pI marker behavior.
- Numerical simulations were performed to predict the separation of serum albumin and cardiac troponin I.
Main Results:
- The developed model accurately predicts pH gradient formation and pI marker behavior in FFIEF.
- Simulation results demonstrate the effect of the electric field on continuous protein separation.
- A novel channel design incorporating cross-stream flow improved separation resolution threefold compared to a straight channel.
Conclusions:
- The validated mathematical model provides insights into FFIEF for microfluidic chip design.
- The proposed channel design significantly enhances protein separation resolution, enabling more efficient bioprocessing.
- FFIEF is a promising technique for continuous and high-resolution separation of biomolecules.
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