1. Dept. of Chemical and Biological Engineering; University of Sheffield; Mappin Street Sheffield S1 3JD U.K.
2. Dept. of Science; Nestlé Product Technology Centre; Haxby Road York YO31 8FZ U.K.
3. Dept. of Research and Development; Nestlé SA Headquarters; Avenue Nestlé 55 CH-1800 Vevey Switzerland