1. Institute of Human Nutrition and Food Science, University of Kiel, Olshausenstrasse 40, D-24118 Kiel, Germany, Department of Food Science and Technology, University of California, Davis, California 95616, Institute of Physical and Theoretical Chemistry, University of Potsdam, Kantstr. 55, D-14513 Teltow, Germany, and Max Planck Institute for Colloids- and Interface Research, Kantstr. 55, D-14513 Teltow, Germany