Monostarch phosphate

Monostarch phosphate is a modified starch produced by reacting native starch — typically derived from corn, potato, wheat, or tapioca — with phosphoric acid or phosphate salts, esterifying a single phosphate group onto each starch molecule. This chemical modification significantly improves the starch's performance as a thickening and gelling agent: monostarch phosphate creates thicker, more viscous pastes than unmodified starch at equivalent concentrations, shows improved stability during heating and cooling cycles, and resists retrogradation (the tendency of native starch gels to become rubbery and opaque on cooling). It is widely used in soups, sauces, gravies, and processed foods requiring stable thickening.

JECFA evaluated monostarch phosphate in 1981 as part of its comprehensive assessment of modified food starches and classified the ADI as "not specified." This determination reflects the view that modified food starches are chemically and metabolically similar to their native starch counterparts and do not present toxicological concerns at levels used in food. The phosphate groups added during modification are present at low levels and come from phosphate — an essential dietary mineral — making the modification nutritionally inconsequential.

Monostarch phosphate is approved throughout the EU and in most global food markets as a food thickener and texturiser. It appears on ingredient labels as monostarch phosphate, starch sodium phosphate (when sodium is the counter-ion), or E1410. For consumers with wheat allergy or coeliac disease, the source grain of any modified starch is important: EU labelling regulations require declaration of the grain source when wheat, rye, barley, or oats are used. Corn- or potato-derived monostarch phosphate is gluten-free and appropriate for coeliac consumers.