Supported lipopolymer membranes as nanoscale filters: Simultaneous protein recognition and size-selection assays

Fernando Albertorio, Susan Daniel, Paul S. Cremer

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A technique for size-selective discrimination of protein analytes was developed by incorporating poly(ethylene glycol) (PEG) lipopolymers into supported lipid bilayers. The membranes also contained biotinylated lipids, which recognized both streptavidin and anti-biotin IgG. By employing various PEG lipopolymer concentrations, clear discrimination against anti-biotin (Mw = 150000 Da) binding could be observed, which became more pronounced at higher polymer densities. On the other hand, streptavidin (Mw = 52800) binding to the membrane remained unaffected even at PEG concentrations that were well into the mushroom-to-brush phase transition. These observations were exploited to create an on-chip ligand-receptor binding assay that favored streptavidin binding over anti-biotin by several orders of magnitude in the presence of the lipopolymer. Control experiments revealed that the two proteins are bound to similar extents from a multi-protein analyte solution in the absence of PEG.

Original languageEnglish (US)
Pages (from-to)7168-7169
Number of pages2
JournalJournal of the American Chemical Society
Issue number22
StatePublished - Jun 7 2006


All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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