https://www.aceingredients.com/products/e450i-sodium-acid-pyrophosphate-sapp.html E450i Sodium Acid Pyrophosphate (SAPP) Sodium acid pyrophosphate 450 (SAPP) is often used in roasted foods to control the fermentation speed and shorten fermentation time. It can be used in isntant noodles, cakes, and crackers.