[1] Dept. of Chem. Eng. and Appl. Chem., University of Toronto, Toronto, Ont. M5S 3E5, Canada
[2] Norwegian Inst. for Food Research, MATFORSK, Osloveien 1, N-1430 Ås, Norway
[3] Environmental and Resource Studies, Trent University, Peterborough, Ont. K9J 7B8, Canada