title: pH sensitive adsorption of polypeptide/sodium dodecyl sulfate mixtures.
abstract: Neutron reflectivity and surface tension have been used to investigate the pH sensitivity of the adsorption of poly-L-lysine hydrobromide and sodium dodecyl sulfate mixtures at the air-solution interface. The surface tension variation with surfactant concentration is complex, and between the critical aggregation concentration and critical micellar concentration there is a marked increase in the surface tension. The neutron reflectivity results show that this is associated with a depletion of the surface of polypeptide/surfactant complexes. The variations in the adsorption and surface tension with pH are attributed to changes in the polypeptide conformation at the interface and in solution.
authors.affiliation: ISIS, Rutherford Appleton Laboratory, Didcot, OXON, OX11 0QX. j.penfold@rl.ac.uk
authors.forename: J
authors.initials: J
authors.lastname: Penfold
authors.forename: I
authors.initials: I
authors.lastname: Tucker
authors.forename: R K
authors.initials: RK
authors.lastname: Thomas
authors.forename: D J F
authors.initials: DJ
authors.lastname: Taylor
authors.forename: X L
authors.initials: XL
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D009502:Neutrons; D011107:Polylysine / Q000737:chemistry*; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*; D012996:Solutions; D014867:Water / Q000737:chemistry
chemical_list: D012996:Solutions; D014867:Water; D011107:Polylysine; D012967:Sodium Dodecyl Sulfate