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Sodium Tripolyphosphate/Pentasodiumtriphosphate I.H.C. Chempharm Sodium Tripolyphosphate/Pentasodiumtriphosphate is an inorganic compound with formula Na5P3O10. It is the sodium salt of the polyphosphate penta-anion, which is the conjugate base of triphosphoric acid. STPP is a preservative for seafood, meats, poultry, ...展开 Sodium Tripolyphosphate/Pentasodiumtriphosphate is an inorganic compound with formula Na5P3O10. It is the sodium salt of the polyphosphate penta-anion, which is the conjugate base of triphosphoric acid. STPP is a preservative for seafood, meats, poultry, and animal feeds. It is common in food production as E number E451. In foods, STPP is used as an emulsifier and to retain moisture. Many governments regulate the quantities allowed in foods, as it can substantially increase the sale weight of seafood in particular. The United States Food and Drug Administration lists STPP as "generally recognized as safe." 收起