Electrowetting-based microfluidics for analysis of peptides and proteins by matrix-assisted laser desorption/ionization mass spectrometry.
A new technique for preparing samples for matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) is reported. The technique relies on electrowetting-on-dielectric (EWOD) to move droplets containing proteins or peptides and matrix to specific locations on an array of electrodes for analysis. Standard MALDI-MS reagents, analytes, concentrations, and recipes are demonstrated to be compatible with the technique. Mass spectra are comparable to those collected by conventional methods. Nonspecific adsorption of analytes to device surfaces is demonstrated to be negligible. The results suggest that EWOD may be a useful tool for automating sample preparation for high-throughput proteomics and other applications of MALDI-MS.
Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, USA.
Aaron R
AR
Wheeler
Hyejin
H
Moon
Chang-Jin
CJ
Kim
Joseph A
JA
Loo
Robin L
RL
Garrell
D004867:Equipment Design; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation / Q000379:methods*; D010455:Peptides / Q000032:analysis*; D011506:Proteins / Q000032:analysis*; D020543:Proteome / Q000032:analysis; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000295:instrumentation / Q000379:methods
D010455:Peptides; D011506:Proteins; D020543:Proteome