title: Formation of supported phospholipid bilayers via co-adsorption with beta-D-dodecyl maltoside.
abstract: We have investigated the formation of supported model membranes via the adsorption of phospholipid-surfactant mixtures at the Si-water interface by specular neutron reflection. The adsorption of mixed micelles of the nonionic surfactant beta-D-dodecyl maltoside and DOPC or POPC was determined as a function of bulk concentration, and using d25-beta-D-dodecyl maltoside, the composition of DOPC and POPC bilayers was determined. Bilayer thicknesses of 39+/-3 A for DOPC and 41+/-3 A for POPC agree well with data from bulk lamellar phases for both lipids, and the average area per lipid molecule can be varied from 62 to 115 A2 by varying the bulk concentrations used. The amount of surfactant in the bilayer is very sensitive to the bulk volume-to-surface area ratio, but it can be fully eliminated by ensuring a sufficiently large dilution/rinsing volume of the solution.
authors.affiliation: Oxford University, Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, United Kingdom. hanna.vacklin@chem.ox.ac.uk
authors.forename: Hanna P
authors.initials: HP
authors.lastname: Vacklin
authors.forename: F
authors.initials: F
authors.lastname: Tiberg
authors.forename: R K
authors.initials: RK
authors.lastname: Thomas
mesh_terms: D000327:Adsorption; D020285:Cryoelectron Microscopy; D005960:Glucosides / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D008051:Lipid Bilayers / Q000737:chemistry*; D008823:Micelles; D010713:Phosphatidylcholines / Q000737:chemistry; D010743:Phospholipids / Q000737:chemistry*
chemical_list: D005960:Glucosides; D008051:Lipid Bilayers; D008823:Micelles; D010713:Phosphatidylcholines; D010743:Phospholipids; C040358:dodecyl maltoside; C017251:1,2-oleoylphosphatidylcholine; C028694:1-palmitoyl-2-oleoylphosphatidylcholine