what is gluten in?
For food products made from gluten, see Wheat gluten (food) . Sources of gluten: Clockwise from top: high-gluten wheat flour, European spelt, barley, rolled rye flakes. Gluten (from Latin gluten,  glue ) is a protein composite found in wheat and related grains, including barley and rye.Gluten gives elasticity to dough, helping it rise and keep its shape and often gives the final product a chewy texture.luten is extracted from flour by kneading the flour, agglomerating the gluten into an elastic network, a dough, and then washing out the starch. Starch granules disperse in cold/low-temperature water, and the dispersed starch is sedimented and dried.