Two-dimensional protein separation with advanced sample and buffer isolation using microfluidic valves.
Methods are described to achieve more efficient multidimensional protein separation in a microfluidic channel. The new methods couple isoelectric focusing (IEF) with high ionic strength electrophoretic separations by active microvalve control in a microchip. Several experiments demonstrating independent 2D separation were performed, and critical parameters for optimal chip performance were identified, including channel passivation, electroosmosis control, and IEF linearity control. This strategy can be used for integration of different heterogeneous separation techniques, such as IEF, capillary electrophoresis, and liquid chromatography. This new device can be ideal for preseparation and preconcentration of complex biomolecule samples for a streamlined biomolecule analysis using mass spectrometry.
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. ycwang@mit.edu
Ying-Chih
YC
Wang
Man Ho
MH
Choi
Jongyoon
J
Han
D002021:Buffers; D015180:Electrophoresis, Gel, Two-Dimensional / Q000379:methods; D013058:Mass Spectrometry / Q000379:methods; D046210:Microfluidic Analytical Techniques / Q000379:methods; D011506:Proteins / Q000302:isolation & purification*
D002021:Buffers; D011506:Proteins