Sodium acid pyrophosphate (SAPP), or disodium dihydrogen pyrophosphate, its food grade is commonly used with sodium bicarbonate as a leavening agent in bakery products; also, it maintains the color in processed potatoes and also prevents struvite crystal in canned seafood. The European food additive number for it is E450(i). Generally, it is vegan and gluten free.
http://www.chinafooding.com/Sodium_acid_pyrophosphate
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