Characterization of proton transport across a waveguide-supported lipid bilayer

Todd W. McBee, Liying Wang, Chenhao Ge, Brooke M. Beam, Ana Moore, Devens Gust, Thomas Moore, Neal R. Armstrong, S. Scott Saavedra

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


Cellular energy transduction processes are often driven by transmembrane ion gradients, and numerous artificial biomembrane systems have been developed that allow for chemically or light-induced charge transport into/out of liposomes. Liposomal architectures, however, are not readily interfaced to a solid-state transducer. Formation of an ion gradient across a planar-supported membrane, "wired" to a substrate electrode, may ultimately allow utilization of the potential energy to drive other electrochemical processes. Described here is a novel conductive polymer/planar waveguide assembly that provides for highly sensitive transduction of proton transport across a planar-supported lipid bilayer (PSLB). A quinone proton shuttle is embedded in the PSLB, which is coupled to the planar optical waveguide electrode through a pH-sensitive, self-assembled conductive polymer film. Interfacial potential and absorbance changes in the conductive polymer film provide for sensitive characterization of transmembrane proton transport. The general and flexible nature of this architecture makes it adaptable to many different types of transmembrane transport chemistries, particularly light-activated systems.

Original languageEnglish (US)
Pages (from-to)2184-2185
Number of pages2
JournalJournal of the American Chemical Society
Issue number7
StatePublished - Feb 22 2006

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry
  • Biochemistry
  • Colloid and Surface Chemistry


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