1. Department of Fisheries & Oceans Canada, 501 University Crescent, Winnipeg, Manitoba R3T 2N6, Canada, Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada, Department of Chemistry, University of Winnipeg, Winnipeg, Manitoba R3B 2E9, Canada, Food Research Division, Health Products and Food Branch, Health Canada, Ottawa, Ontario K1A 0L2, Canada, and Warnell School of Forest Resources, University of Georgia, Athens, Georgia 30602