Sweet potato (Ipomoea batatas ) is a dicotyledonous plant that belongs to the family convolvulaceae. It is large starchy sweet-tasting tuberous root (root vegetable) (Woolfe 1992). The young leaves and shoots are sometimes eaten as green. Sweet potato is a native to the tropical regions in America (Ipomoea batatas native to tropical America), it is cultivated throughout the tropics and warm temperate regions of the world for its starchy roots, which can provide nutrition besides energy. It is a crop that thrives very well in both temperate and tropical climates (Woolfe 1992). The plant is a herbaceous perennial vine , bearing alternative heart-shaped or palmately lobed leaves and medium-sized sympetalous flowers .The edible tuberous root is long and tapered , ovoid or round with a skin colour ranging from yellow , orange ,red ,purple ,brown or beige and flesh colour ranging from white, red , pink, beige, yellow , orange and purple. Sweet potato varieties with white, pale or yellow flesh are less sweet and moist than those with red, pink or orange flesh (Gad and George 2009). Some cultivars with Orange/yellow fleshed are very rich in carotenoids and a good dietary source of B-carotene from which the human body synthesizes the vitamin A (Low and Van 2008). Sweet potato has a large potential to be used as a food in developing nations with limited resources because of its short maturity time and ability to grow under diverse climatic condition and on less fertile soil. Options for sweet potato products are numerous, and based on recent diagnostic assessments carried out in developing countries; dried chips, starch, and flour were identified as among the most promising (Collins, 1989).