The functional properties that can be ascribed to the soybean proteins are solubility, water absorption and binding, viscosity, gelation, cohesion-adhesion, elasticity, emulsification, fat absorption, flavor binding and color control. Among the plant proteins, soybean proteins are the most studied (and thus the best understood plant protein) and are often used in comparison with other plant proteins in order to evaluate their functional properties (Mcwatters and Cherry, 1977).