1Department of Biochemistry, Faculty of Agriculture, Zagazig University, Zagazig 44519, Egypt 2 Institut fur Lebensmittelchemie, Hamburg University, Grindelallee 117, 20146 Hamburg, Germany 3Cellulosic Biofuel Network, Soils and Crops Research and Development Center, Agriculture and Agri-Food Canada, Canada 4 Institute for Lipid Research, Federal Research Center for Nutrition and Food, Germany 5Food Sciences and Technology Department, College of Agricultural Studies, Sudan University of Science & Technology, P.O. Box 71 Khartoum North, Sudan