Sodium Acid Pyrophosphate (SAPP) is a multifunctional food additive that serves as an acidulant, leavening agent, and stabilizer. It is a white, crystalline powder with good solubility in water. SAPP is commonly used in bakery products, such as cakes, bread, and pastries, to help them rise and achieve a desirable texture. As a stabilizer, SAPP regulates the pH level of food, preventing discoloration and maintaining the desired color. It also acts as a chelating agent, improving the quality and shelf life of various food products.