Resting time, also known as autolyse, allows the flour to fully hydrate, which promotes gluten development and enzyme activity, resulting in a more extensible and flavorful dough.
Resting time, often referred to as autolyse in sourdough baking, is a crucial step that significantly impacts gluten development. When flour and water are mixed and allowed to rest before adding the starter and salt, several important processes occur. First, the flour particles fully hydrate. This hydration allows the gluten proteins, gliadin and glutenin, to begin aligning and forming the gluten network. Second, enzymes present in the flour, such as amylase and protease, become active. Amylase breaks down starches into simpler sugars, providing food for the yeast and contributing to the dough's sweetness and browning. Protease breaks down some of the gluten proteins, making the dough more extensible and easier to handle. This resting period results in a smoother, more elastic dough with improved structure and flavor. The length of the resting time can vary depending on the type of flour and the desired characteristics of the final loaf, but typically ranges from 20 minutes to several hours.
Don't add salt during the autolyse. Salt inhibits enzyme activity and tightens the gluten structure, which defeats the purpose of the resting period. Add salt after the autolyse, when you incorporate the starter.