Food emulsifiers ,are a kind of food additive which derive from all kinds of oil ,which are used to assist the stabilization and formation of emulsions by reducing surface tension at the oil–water interface.An emulsifier is well known for its emulsifying effects in different fields to function , like in modifies oil crystal to prevents water spattering in cooking;stabilize foam and to make smooth texture in ice cream and also to keeps its shape;To react with proteins to make a smooth easy-rising dough in bread or act on starch to make bread soft.