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A prototype two-dimensional capillary electrophoresis system fabricated in poly(dimethylsiloxane).
Xiaoxi Chen1, Hongkai Wu, Chengde Mao
1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA.
Analytical Chemistry
|May 3, 2002
Summary
This study introduces a novel 2D gel electrophoresis method using capillaries. This microfluidic system enables sequential protein separation in orthogonal dimensions for advanced biochemical analysis.
Area of Science:
- Analytical Chemistry
- Biochemistry
- Microfluidics
Background:
- Traditional 2D gel electrophoresis is a powerful protein separation technique.
- Scaling down electrophoresis to microfluidic formats presents challenges in integration and manipulation.
Purpose of the Study:
- To develop a novel capillary-based 2D gel electrophoresis method.
- To demonstrate the feasibility of a microfluidic device for 2D protein separation.
Main Methods:
- A 1D capillary electrophoresis separation was performed, isolated from the second dimension.
- The 1D capillary was connected to an orthogonal array of 2D capillaries for the second separation.
- Poly(dimethylsiloxane) (PDMS) was used for fabricating 3D microfluidic components and reversible connections.
Main Results:
- The system successfully separated a mixture of fluorescein-conjugated carbonic anhydrase, fluorescein-conjugated BSA, and Texas Red-conjugated ovalbumin.
- PDMS membranes enclosed the gel and facilitated protein migration between capillary dimensions.
- Reversible connections were achieved using the elastomeric properties of PDMS.
Conclusions:
- A functional 2D capillary electrophoresis system was demonstrated.
- This microfluidic design offers a pathway for developing integrated devices for complex protein analysis.
- The use of PDMS is suitable for creating microfluidic platforms for multi-dimensional separations.