What is it?
A chemically modified starch made by treating natural starch (from maize, potato, wheat, tapioca or rice) with propylene oxide and a phosphate crosslinking agent. The two modifications work together: the hydroxypropyl groups make it stable across a wide temperature range, and the distarch phosphate crosslinks hold the starch granules together under heat, acid, shear and freeze-thaw cycling.
What does it do?
Acts as a thickener, stabiliser and texturiser. The modifications prevent the starch from breaking down or becoming watery when food is cooked, chilled, frozen or acidified. The result is a smooth, consistent texture in the finished product that holds up during processing and on the shelf.
Where you will see it
Widely used in low-fat or fat-free products where starch replaces fat to give creaminess. Common in canned soups, pasta sauces, pot noodles, salad dressings, cream-style desserts, yoghurts, processed cheese, baby foods and ready meals. On UK ingredient labels it appears as 'modified starch' or as 'hydroxypropyl distarch phosphate', sometimes preceded by the source plant (e.g. 'modified maize starch').