Which protein found in flour is responsible for elasticity?

Which protein found in flour is responsible for elasticity?

• A. Gliadin
• B. Glutenin
• C. Casein
• D. Albumin

Answer: (B)

The protein responsible for elasticity in flour is glutenin. Glutenin is one of the two main proteins found in wheat flour, the other being gliadin. While gliadin contributes to the extensibility of the dough, glutenin plays a critical role in its elasticity. When flour is mixed with water, these proteins absorb the water and undergo a process called hydration, which allows them to bond together and form gluten. This gluten matrix is essential for developing the structure required in baked goods, providing strength and the ability to stretch during fermentation and proofing.

Glutenin's ability to form strong elastic networks while maintaining some extensibility allows baked products, such as bread, to rise properly and have the desired texture. This elasticity is particularly important in breads and other yeasted products, where the dough needs to expand and hold its shape as gases are produced during fermentation.

While the other proteins mentioned—casein and albumin—are found in other food sources, they are not components of flour and do not contribute to dough elasticity in the same way glutenin does.