Acylation has been shown to be an effective toolfor improving surface functional properties of plant proteins.Soy bean protein has been extensively modified throughchemical and enzvmatic treatments.Their effectiveness lies intheir high nutritional value and low cost,which promotetheir use as ingredients for the formulation of food products.This paper reports a complete review of chemical modificationof various proteins from plant and animal sources,The nutri-tive and toxicological aspects throug