title: Controlling ionic conductivity in lipid polyelectrolyte composite capsules by cholesterol.
abstract: The effect of cholesterol on the formation and properties of bilayer lipid membranes deposited on polyelectrolyte multilayered capsules was studied. The permeability of lipid/cholesterol coated capsules for NaCl was derived from osmotic response experiments and ranged from 1.45 x 10(-8) to 2.9 x 10(-8) m.s(-1), which corresponds to a lipid layer conductivity of (0.7-1.4) x 10(-8) S.m(-1). These conductivity values were in good agreement with the value of 0.8 x 10(-8) S.m(-1) obtained by electrorotation and were by 3 orders of magnitude lower than those found earlier for lipid layers on polyelectrolyte capsules in the absence of cholesterol.
authors.affiliation: Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Golm/Potsdam, Germany. radostina.georgieva@mpikg-golm.mpg.de
authors.forename: Radostina
authors.initials: R
authors.lastname: Georgieva
authors.forename: Sergio E
authors.initials: SE
authors.lastname: Moya
authors.forename: Hans
authors.initials: H
authors.lastname: Bäumler
authors.forename: Helmuth
authors.initials: H
authors.lastname: Möhwald
authors.forename: Edwin
authors.initials: E
authors.lastname: Donath
mesh_terms: D015060:1,2-Dipalmitoylphosphatidylcholine; D002214:Capsules; D002784:Cholesterol / Q000737:chemistry*; D004553:Electric Conductivity; D004573:Electrolytes / Q000737:chemistry*; D007477:Ions; D008051:Lipid Bilayers; D008055:Lipids / Q000737:chemistry*; D008081:Liposomes / Q000737:chemistry; D018613:Microscopy, Confocal; D008958:Models, Molecular; D008968:Molecular Conformation; D019279:Resin Cements; D014227:Triazines
chemical_list: D002214:Capsules; D004573:Electrolytes; D007477:Ions; D008051:Lipid Bilayers; D008055:Lipids; D008081:Liposomes; D019279:Resin Cements; D014227:Triazines; D015060:1,2-Dipalmitoylphosphatidylcholine; D002784:Cholesterol; C011907:melamine