1. Food Research Program, Pacific Agri-Food Research Centre, Agriculture and Agri-Food Canada, Summerland, British Columbia, Canada V0H 1Z0; Department of Food Science, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2; and Estación Experimental Agropecuaria Balcarce, Instituto Nacional de Tecnología Agropecuaria, 7620 Balcarce, Buenos Aires, Argentina