Gluten
Gluten is a network of proteins that forms when wheat flour is mixed with water. Two proteins, glutenin and gliadin, link together into stretchy, elastic strands that trap gas, which is what lets bread rise and gives baked goods their chew.
What gluten is made of
Dry flour doesn't contain gluten as such. It contains two groups of storage proteins:
- Glutenin: long, coiled molecules that provide elasticity, the springiness that makes dough bounce back.
- Gliadin: smaller, compact molecules that provide extensibility, the ability to stretch without tearing.
Add water and these proteins unfold and bond with each other, mostly through disulfide bridges and weaker hydrogen bonds. Mixing and kneading organize them into sheets and strands. That combined network is gluten.
What gluten does in baking
- Traps gas: carbon dioxide from yeast or chemical leaveners inflates the gluten network like tiny balloons.
- Gives structure: when baked, gluten sets around 70–80 °C / 160–175 °F alongside starch, locking in shape.
- Creates texture: strong gluten means chewy bagels and crusty bread; weak gluten means tender cakes and flaky pastry.
Protein content by flour
| Flour | Protein |
|---|---|
| Cake flour | 7–9% |
| Pastry flour | 8–10% |
| All-purpose flour | 10–12% |
| Bread flour | 12–14% |
| Vital wheat gluten | 70–80% |
Canadian all-purpose flour tends toward the higher end (about 12–13%) because it is milled from hard wheat.
What strengthens or weakens gluten
Strengthens: kneading, water, salt (tightens the network), time, and acidic or vitamin C dough conditioners in small amounts.
Weakens: fat (coats proteins), sugar (competes for water), excess acid or alkali, bran particles in whole-wheat flour, and protease enzymes in fresh pineapple or papaya.
Learn more about how mixing builds it in gluten development.
Gluten and health
People with celiac disease react to gluten proteins, even in trace amounts, and must avoid wheat, barley and rye. Others have non-celiac gluten sensitivity or a wheat allergy. Gluten itself is not harmful to people without these conditions.
Gluten-free baking
Without gluten, doughs can't trap gas well. Gluten-free recipes use blends of rice, sorghum and starch flours with binders like xanthan gum (about 1/2 tsp per 140 g cup of flour for cakes, 1 tsp for bread) or psyllium husk.
Questions
Which grains contain gluten?
Wheat (including spelt, durum, semolina, kamut and farro), barley and rye. Oats don't contain gluten naturally but are often cross-contaminated unless labelled gluten-free.
Which flour has the most gluten?
Bread flour and high-gluten flour, at about 12–14% protein. All-purpose flour is around 10–12%, and cake flour about 7–9%.
Does cooking destroy gluten?
No. Heat sets gluten into a firm structure but does not remove it, so baked goods made with wheat are not safe for people with celiac disease.
What can replace gluten in gluten-free baking?
Binders like xanthan gum, psyllium husk, eggs and starches mimic some of gluten's stretch and structure, though no single ingredient fully replaces it.