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Oil/Alkanethiol Layers for the Study of Emulsified Protein Conformation by Surface Plasmon Resonance Using Monoclonal
1Unité d'Immunochimie, S.R.V., Institut National de la Recherche Agronomique, Centre de Clermont-Ferrand-Theix, St. Genes Champanelle, 63122, France
A method combining surface plasmon resonance and epitope mapping was developed to study the protein conformation at the oil/water interface of an emulsion. The conformation of beta-lactoglobulin stabilizing dodecane/water and miglyol/water interfaces was investigated using five anti-beta-lactoglobulin monoclonal antibodies. The developed method allows us to specifically recognize the emulsified beta-lactoglobulin at the surface of a sensor chip with good repeatability; i.e., standard deviations range between 0.7 and 3.6%. Considering that the monoclonal antibodies, recognizing conformational epitopes, still bind to beta-lactoglobulin at oil/water interfaces, it is concluded that the protein retains a globular conformation. It is shown that the inhibition-binding values of two pairs of Mabs are different for beta-lactoglobulin stabilizing dodecane/water and miglyol/water interfaces. This indicates that the conformations of emulsified beta-lactoglobulin are slightly different according to the nature of the oil phase. Copyright 2000 Academic Press.
A method combining surface plasmon resonance and epitope mapping was developed to study the protein conformation at the oil/water interface of an emulsion. The conformation of beta-lactoglobulin stabilizing dodecane/water and miglyol/water interfaces was investigated using five anti-beta-lactoglobulin monoclonal antibodies. The developed method allows us to specifically recognize the emulsified beta-lactoglobulin at the surface of a sensor chip with good repeatability; i.e., standard deviations range between 0.7 and 3.6%. Considering that the monoclonal antibodies, recognizing conformational epitopes, still bind to beta-lactoglobulin at oil/water interfaces, it is concluded that the protein retains a globular conformation. It is shown that the inhibition-binding values of two pairs of Mabs are different for beta-lactoglobulin stabilizing dodecane/water and miglyol/water interfaces. This indicates that the conformations of emulsified beta-lactoglobulin are slightly different according to the nature of the oil phase. Copyright 2000 Academic Press.
