1. Department of Food Science and Technology, Faculty of Agriculture; University of Khartoum; Shambat 14413 Sudan
2. Elfeij Technical College; Postal Code 3542 Wad medani Sudan
3. Faculty of Agriculture; University of Zalingie; PO Box 6 Zalingie Sudan
4. Department of Food Science and Nutrition, College of Food and Agricultural Sciences; King Saud University; PO Box 2460 Riyadh 11451 Kingdom of Saudi Arabia