Tetrasodium pyrophosphate (TSPP), also called tetrasodium disphosphate or sodium pyrophosphate, is a synthetic ingredient that can be used as an acid regulator, sequestrant, protein modifier, coagulant, and a dispersing agent in food with the European food additive number E450(iii). It is gluten free and vegan.
http://www.chinafooding.com/Tetrasodium_pyrophosphate
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