Tethered bilayer lipid membranes based on monolayers of thiolipids mixed with a complementary dilution molecule. 1. Incorporation of channel peptides

Lizhong He, Joseph W.F. Robertson, Jing Li, Iris Kärcher, Stefan M. Schiller, Wolfgang Knoll, Renate Naumann

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Abstract

Tethered bilayer lipid membranes (tBLMs) are described based on the self-assembly of a monolayer on template stripped gold of an archea analogue thiolipid, 2,3-di-o-phytanyl-sn-glycerol-1-tetraethylene glycol-D, L-aα-lipoic acid ester lipid (DPTL), and a newly designed dilution molecule, tetraethylene glycol-D,L-α-lipoic acid ester (TEGL). The tBLM is completed by fusion of liposomes made from a mixture of diphytanoylphosphatidyl choline (DPhyPC), cholesterol, and 1,2-diphytanoyl-sn-glycero-3-phosphate (DPhyPG) in a molar ratio of 6:3:1. Melittin and gramicidin are incorporated into these tBLMs as shown by surface plasmon resonance (SPR) and electrochemical impedance spectroscopy (EIS) studies. Ionic conductivity at 0 V vs Ag|AgCl, 3 M KCl, measured by EIS measurements are comparable to the results obtained by other research groups. Admittance plots as a function of potential are discussed on a qualitative basis in terms of the kinetics of ion transport through the channels.

Original languageEnglish
Pages (from-to)11666-11672
Number of pages7
JournalLangmuir
Volume21
Issue number25
DOIs
Publication statusPublished - 6 Dec 2005

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