1. Department of Food Science, University of Guelph, Guelph, Ontario, N1G 2W1 Canada, Université Paris-Sud XI, Centre d'Etudes Pharmaceutiques, Laboratoire de Physico-chimie des Systèmes Polyphasés, UMR CNRS 8612, Chatenay-Malabry, France, and Department of Physics, University of Waterloo, Waterloo, Ontario, N2L 3G1 Canada