Sodium trimetaphosphate (STMP) is an inorganic compound with the chemical formula Na5P3O10. It is a white, crystalline powder that is soluble in water and has a high content of phosphorus. Sodium trimetaphosphate is used as a sequestering agent, emulsifying agent, and thickener in food processing. It is also used as a dispersant in ceramics and as a flame retardant in plastics.
In the esterification of starch
Sodium trimetaphosphate is a type of phosphorus-containing compound that can act as a cross-linking agent in the esterification of starch. The cross-linking of starch molecules using sodium trimetaphosphate can increase the strength and stability of the swollen granules of the modified starch, making it more resistant to viscosity breakdown under mechanical shear, acid conditions, or high temperature. The extent of the cross-linking reaction and the type of starch used can affect the specific characteristics and properties of the modified starch. The use of sodium trimetaphosphate in the esterification of starch can result in modified starches with improved functional properties compared to unmodified native starches.