What Is Sodium Tripolyphosphate?

Sodium tripolyphosphate (STPP) is a white, crystalline powder that belongs to the class of inorganic compounds known as polyphosphates. Its chemical formula is Na5P3O10 and it contains five sodium ions (Na+) and three phosphate ions (PO43-).

STPP is commonly used as a food additive, especially in processed meats, seafood, and dairy products, as well as in detergents, water treatment, and other industrial applications. It functions as a sequestrant, chelating agent, and buffering agent, helping to maintain pH levels, bind metal ions, and prevent spoilage.

In terms of safety, STPP is generally recognized as safe by regulatory agencies such as the US Food and Drug Administration (FDA), but excessive intake may cause gastrointestinal distress or interfere with mineral absorption. Therefore, it is important to follow recommended usage levels and guidelines.