The Science of Gluten Development in Sourdough: Why Strong Dough Makes Better Bread

Gluten gets talked about a lot in baking circles, usually in one of two ways: either people are avoiding it, or people are obsessing over it. If you are in the second camp (which, if you are reading a sourdough blog on a Monday evening, you probably are), then understanding what gluten actually does inside your dough is one of the most useful things you can learn. Not in a textbook way, but in a practical, hands-on, why-did-my-loaf-go-flat kind of way.

Spring is a genuinely good time to get into this stuff. The kitchen is warming up, bulk ferments are moving faster, and if you have been baking through winter with sluggish, stiff doughs, you might be noticing your dough behaving a bit differently now. A lot of that comes back to gluten, how it develops, and how temperature and time affect it. So let us get into it.

What Gluten Actually Is

Flour contains two proteins called glutenin and gliadin. On their own, they sit there doing not much. Add water, and they start to bond together into long, elastic networks. That network is gluten. It is what gives dough its stretchy, chewy character, and crucially, it is what traps the carbon dioxide produced by your starter during fermentation. No gluten network, no structure. No structure, no oven spring. No oven spring, sad flat loaf.

The strength and extensibility of that network depends on a few things: how much protein is in your flour, how much water you add, how you handle the dough, and how long you give it. Those four variables are basically the whole game.

Hydration and Gluten: The Relationship Is Complicated

Higher hydration doughs are often held up as the gold standard in sourdough circles, and they do produce gorgeous open crumbs when everything goes right. But there is a trade-off. Water is both essential for gluten formation and, in large amounts, a plasticiser that weakens the network. More water means more extensibility (the dough stretches easily) but less elasticity (it does not spring back as firmly). That is why 80% hydration doughs can feel like they are basically alive and impossible to shape if your gluten development is not properly sorted first.

The lesson here is not to chase high hydration for its own sake. Build the gluten network properly at whatever hydration you are working with, and the dough will tell you whether it is ready.

How Folding Actually Builds Structure

When you mix flour and water, some gluten forms almost immediately through a process called autolyse. But those early bonds are weak and disorganised. The physical act of folding the dough, whether that is stretch and fold, coil fold, or lamination, does two things. It aligns the gluten strands in layers, and it introduces tension that encourages further bonding. Think of it like stacking sheets of cling film: one layer does not do much, but twenty aligned layers together become surprisingly tough.

This is why the timing of your folds matters. Early in bulk fermentation, the dough is extensible but weak, so folds build structure fast. Later in bulk, the dough is more developed and gas has started to accumulate, so aggressive handling will degas it and damage the structure you have built. There is a reason you ease off the folds in the second half of bulk.

On a practical note, I find coil folds work really well in spring because the dough warms up faster and the folds feel cleaner. The dough has a kind of liveliness to it that you just do not get in January when the kitchen is cold and everything takes forever.

Fermentation and Gluten Degradation: The Part People Miss

Here is where it gets interesting. The same fermentation process that makes sourdough taste good, produces the CO2 that makes it rise, and creates all those complex organic acids, also slowly degrades gluten over time. The bacteria and wild yeast in your starter produce enzymes called proteases, which break down protein bonds. A little of this is beneficial: it makes the dough more extensible and improves flavour. Too much, and your gluten network literally falls apart.

This is why over-fermented dough has that sticky, almost gluey feel and refuses to hold any shape. The gluten has been enzymatically digested to the point where it cannot do its job. It also explains why spring baking requires a bit more attention than winter baking. A bulk ferment that took ten hours at 18°C in February might be done in six hours at 22°C in April. The enzymes are working faster, the yeast is more active, and if you are not paying attention, you can tip from perfectly developed to over-fermented before you realise it.

Flour Type and Why It Changes Everything

Whole wheat and rye flours add a complexity that goes beyond protein percentage. They contain bran particles that physically cut through gluten strands like little scissors. This is why adding a significant proportion of whole wheat to a dough often produces a denser crumb, not because whole wheat lacks gluten, but because the bran interferes with the network. Many bakers sieve out some of the bran, or use a longer autolyse to soften it before mixing. You can also compensate by adding a small amount of vital wheat gluten, though honestly, starting with a quality strong white flour and adding whole wheat gradually as you build experience is the more forgiving approach.

If you are experimenting with flour types this spring and finding your doughs behaving unexpectedly, it is genuinely useful to have somewhere to ask those questions in real time. The DoughRise Coach is good for exactly this: you can describe what your dough is doing, get personalised troubleshooting, and actually understand what to change next time rather than just guessing. It is like having a knowledgeable baking mate on call, without having to text someone at 11pm asking why your levain smells weird.

What Good Gluten Development Actually Feels Like

All of the science is useful, but baking is ultimately a tactile skill. Well-developed gluten has a specific feel that you learn to recognise. The dough is smooth and slightly tacky but not sticky. It holds its shape when you set it down rather than spreading. When you stretch a small piece between your fingers, it forms a thin, translucent membrane before tearing. That last test, the windowpane test, is one of the most reliable ways to check gluten development at any stage of your bake.

A strong windowpane means your gluten can hold gas. A weak one means more work is needed, or in some cases, that the dough has been over-fermented and the network is already breaking down. Context matters.

Happy baking! Find everything you need at doughrise.store

Photo by Benjamin Jauregui on Unsplash