title: Interaction of DPPC monolayers with soluble surfactants: electrostatic effects of membrane perturbants.
abstract: We studied the effects of four soluble surfactants on DPPC monolayers to elucidate the action of these membrane perturbants. The presence of nonionic N-9 and amphoteric C31G strongly affected the pure DPPC isotherm, while anionic SDS and cationic DTAB had little effect. The impact of surfactant on DPPC domain shape in the liquid condensed-liquid expanded coexistence region showed the opposite result. Neutral surfactants had minimal effect on the shape of DPPC domains; charged surfactants, on the other hand, induced a new shape transition at high surface pressures previously unreported for DPPC domains. All of these results are discussed with particular attention given to electrostatic effects at the interface.
authors.affiliation: Department of Chemical Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA.
authors.forename: C W
authors.initials: CW
authors.lastname: McConlogue
authors.forename: D
authors.initials: D
authors.lastname: Malamud
authors.forename: T K
authors.initials: TK
authors.lastname: Vanderlick
mesh_terms: D015060:1,2-Dipalmitoylphosphatidylcholine / Q000737:chemistry*; D003902:Detergents; D008567:Membranes, Artificial; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry; D012995:Solubility; D055672:Static Electricity; D013501:Surface-Active Agents / Q000737:chemistry*; D013696:Temperature
chemical_list: D003902:Detergents; D008567:Membranes, Artificial; D013501:Surface-Active Agents; D015060:1,2-Dipalmitoylphosphatidylcholine; D012967:Sodium Dodecyl Sulfate