1. Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, 6700 EK Wageningen, The Netherlands, Food Physics Group, Wageningen University, Bomenweg 2, 6703 HD Wageningen, The Netherlands, and Laboratory of Biochemistry, Wageningen University, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands