Protein separation by electrophoretic-electroosmotic focusing on supported lipid bilayers

Chunming Liu, Christopher F. Monson, Tinglu Yang, Hudson Pace, Paul S. Cremer

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


An electrophoretic-electroosmotic focusing (EEF) method was developed and used to separate membrane-bound proteins and charged lipids based on their charge-to-size ratio from an initially homogeneous mixture. EEF uses opposing electrophoretic and electroosmotic forces to focus and separate proteins and lipids into narrow bands on supported lipid bilayers (SLBs). Membrane-associated species were focused into specific positions within the SLB in a highly repeatable fashion. The steady-state focusing positions of the proteins could be predicted and controlled by tuning experimental conditions, such as buffer pH, ionic strength, electric field, and temperature. Careful tuning of the variables should enable one to separate mixtures of membrane proteins with only subtle differences. The EEF technique was found to be an effective way to separate protein mixtures with low initial concentrations, and it overcame diffusive peak broadening to allow four bands to be separated simultaneously within a 380 μm wide isolated supported membrane patch.

Original languageEnglish (US)
Pages (from-to)7876-7880
Number of pages5
JournalAnalytical Chemistry
Issue number20
StatePublished - Oct 15 2011

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry


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