the effect of chubak extract on sponge cake as an egg white substitute

chubak extract because of its high saponin content, is a unique agent in production stable foam meantime has high pharmaceutical properties. the purpose of current research is to gain these advantages of chubak extract in sponge cake production. for this purpose 25, 50 and 75% of egg white in sponge cake was substituted with this extract and the effects of such substitution on physicochemical and rheological properties of batter and physical and sensorial properties of sponge cakes were evaluated. the results showed that substitution of 75% egg white with chubak extract has no significant effect on specific gravity and flow index behaviour (p > 0.05) but caused a significant decrease on ph and consistency coefficient (p 0.05) and even sensory grant properties of chewiness was enhanced (p > 0.05) and had better effects in comparance with blank sample in moisture preservation and retrogradation retardation during storage times, but caused a significant decrease in sensory grant properties of taste (p < 0.05). this research demonstrated that there is a probable substitution of 50% egg white with chubak extract in sponge cake formulation and thereupon it is possible to produce a functional food product with desirable quality and lower cost.