1.0  INTRODUCTION

Cassava is a major staple crop in Nigeria, as cassava and its product are found in daily meals of Nigeria.

Currently, cassava is undergoing a transition from a mere subsistent crop found on the field of peasants to a commercial crop grown in plantations. Cassava is drought tolerant, staple food crop grown in tropics and subtropical areas. Cassava is to African peasant farmers what rice is to Asian farmer or wheat and potatoes are to European farmers (El-Sharkawy, 2003).

Although raw cassava roots contain significant vitamin C, it is well sensitive to eat and easily leaches into water and therefore almost all of the processing techniques seriously affect its content (Julie et al, 2009).

In the subtropical region of southern China, cassava is the fifth largest crop in term of production, after rice, sweet potato, sugar cane and maize. China is also the largest export market for cassava produced in Vietnam and Thailand. Over 60% of cassava production in China is concentrated in a single province, Guangxi, averaging over 7 million tons annually (Frederick, 2008).

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