Hordein

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Hordein is a glycoprotein, present in barley and some other cereals, together with gliadin and other glycoproteins as gluten.

Some people are sensitive to hordein due to disorders such as celiac disease or gluten intolerance.

Along with gliadin (the gluten found in wheat), hordein is present in many foods and also may be found in beer. Hordein is usually the main problem for coeliacs wishing to drink beer.

Coaliacs are able to find specialist breads that are low in hordein, gliadin and other problematic glycoproteins, just as they can find gluten free beer which either uses ingredients that do not contain gluten, or otherwise has the amounts of gliadin or hordein present controlled to stated limits.