1. Food Research Institute (CSIR), P.O. Box M.20, Accra, Ghana.
2. USDA-ARS Southern Regional Research Center, 1100 Robert E. Lee Blvd., New Orleans, LA 70124.
3. Corresponding author. E-mail: cgrimm@srrc.ars.usda.gov
4. Food Management and Marketing Group, Natural Resources Institute University of Greenwich at Medway Chatham Maritime; Kent, ME4 4TB, England.