Nutritionally, soybean protein is an excellent com-plement to lysine-limited cereal protein, hence the basis for the use of soy flour as an economical pro-tein supplement in biscuit, bread, pasta and other cereal products (Hegstad 2008). The protein con-tent of the biscuits increased from 5.0 to 14.2% (Fig.1) with the increase in soybean flour from 0 to 25%.
The increase in protein content could be due to the increase in the proportion of soybean in the flour blend. Soybean is a high protein legume and incorporation of soy flour inevitable increase the protein content in the biscuits. Addition of soy flour increase the protein, fat and the essential amino acids content thereby has a greater potential in overcoming protein-calorie malnutrition in the world (Akubor and Ukwuru 2005).