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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 7: POSTER: INTERNAL SYMPOSIUM Scattering Experiments

CPP 7.3: Poster

Montag, 26. März 2007, 16:00–18:00, Poster B

Structural investigation of casein micelles in thin films — •E. Metwalli¹, R. Gebhardt¹, A. Tolkach², J.-F. Moulin¹, V. Körstgens¹, S.V. Roth³, R. Cubitt⁴, and P. Müller-Buschbaum¹ — ¹Physikdepartment E13, TU München, 85747 Garching. — ²Chair for Food Process Engineering and Dairy Technology, TU München, Weihenstephan — ³HASYLAB at DESY, Hamburg — ⁴Institut Laue-Langevin, Grenoble, France

Casein micellar films on solid supports have interesting applications in labeling of glass containers and adhesion technology. Gaining structural information on these films will help to optimize the appropriate physical properties for the desired application. Casein micelles thin films were applied from aqueous solutions on pre-cleaned glass slides by spin coating technique. The effect of transglutaminase enzyme concentrations on the thin film structures was investigated using atomic force microscopy (AFM) and grazing incidence small-angle X-ray scattering (GISAXS). The AFM images can only give information on the top surface structure with low statistical significance. In contrary, GISAXS provides information on the in-plane structures of the casein thin film with much higher statistical significance. The GISAXS data on the thin films were compared with those obtained by dynamic light scattering from the solution phase. The swelling behavior of some selected casein films in deuterated water vapor was also investigated using grazing incidence small-angle neutron scattering (GISANS). The results were discussed and compared with various proposed models on the casein micelle structures.