pH sensitive adsorption of polypeptide/sodium dodecyl sulfate mixtures |
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Authors: | Penfold J Tucker I Thomas R K Taylor D J F Zhang X L |
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Affiliation: | ISIS, Rutherford Appleton Laboratory, Didcot, OXON, OX11 0QX. j.penfold@rl.ac.uk |
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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. |
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