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BP: Fachverband Biologische Physik

BP 3: Biopolymers and Biomaterials I (with CPP)

BP 3.4: Vortrag

Montag, 14. März 2011, 11:30–11:45, ZEU 222

Influence of temperature on the morphology of casein micellar films — •Ezzeldin Metwalli¹, Alexander Diethert¹, Joseph Adelsberger¹, Robert Cubitt², Ulrich Kulozik³, and Peter Müller-Buschbaum¹ — ¹TU München, Physik Department, LS Funkt. Mat., James-Franck-Str. 1, 85748 Garching, Germany — ²ILL, 6 rue Jules Horowitz, b.p. 156, 38042 Grenoble, France — ³TU München, Chair for Food Proc. Eng. and Dairy Tech., 85354 Weihnstephan, Germany

Casein micelles for non-food applications such as coatings, adhesives and cosmetics are the main drive to study casein micelles structure in the thin film format. The effect of temperature on the structure of casein micelle films is investigated using grazing incidence small angle neutron scattering (GISANS). GISANS has proved sensitivity to micellar structure due to a high contrast imparted by an outer shell of D₂O on the objects [1]. At different temperatures, various average micelle sizes with large size distribution are due to an aggregation behavior of the casein proteins. For freshly prepared samples, the average micelle size is increasing from about 80 to 120 nm with increasing temperatures from 5 to 35 ^∘C. Aged casein micelles films for 100 days at room temperature indicate a continuous structural reorganization. The continuous aggregation between hydrated micelles in the film to reach equilibrated structures explains the high stability of casein-based coatings and adhesives by the ability to adapt itself to varying environmental conditions. [1] E. Metwalli et al., Langmuir 25, 4124 (2009)