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Baking Science
7 min read
The Science of Gluten in Sourdough: What's Actually Happening Inside Your Dough
Discover the real science behind gluten in sourdough — how it forms, why it matters, and what it means for your crumb, crust, and every bake you do.
Photo by Benjamin Jauregui on UnsplashSpring is a funny time for sourdough bakers. The kitchen is warming up, your starter is suddenly fizzing away with a bit more energy, and if you are anything like me, you are pulling out recipes you shelved over winter and wondering why your dough feels completely different to how you remember it. A slightly warmer bench, a bit more ambient humidity, and everything behaves just a touch differently.
When that happens, most bakers blame the starter or the flour. But a lot of the time, the thing that is actually changing is the gluten. And because gluten is one of those words that gets thrown around constantly without anyone really explaining what it is or what it does, I want to break it down properly here. Not in a textbook way, just in a useful, practical way that actually changes how you handle your dough.
What Gluten Actually Is (It Is Not What Most People Think)
Gluten is not an ingredient. You will not find it listed on a bag of flour. What you will find are two proteins: glutenin and gliadin. On their own, they just sit there. The moment water hits them and you start mixing or working the dough, they link together and form gluten, this vast, tangled network of elastic strands running through your dough.
That network is what gives bread dough its stretch and its structure. Without it, you would have a batter, not a dough. It is the thing that traps the gas your fermentation produces and lets the loaf expand without just collapsing into a flat disc on your bench.
What this means for your bake
Gluten development starts the moment flour meets water, before you have even thought about kneading. Even a simple autolyse rest, just flour and water mixed together and left alone, begins building that network. This is why rested dough almost always feels silkier and more extensible than freshly mixed dough.
Two Properties That Define Everything: Extensibility and Elasticity
Well-developed gluten has two qualities that seem to contradict each other, and balancing them is basically the whole game in sourdough baking.
Elasticity is the dough's desire to spring back. Stretch it out and it wants to return to its original shape. That is glutenin doing its thing. Extensibility is the opposite: the dough's ability to stretch out without tearing. That comes from gliadin.
You want both. Too much elasticity and your dough fights you during shaping, tears during scoring, and the loaf cannot expand properly in the oven. Too much extensibility and you have a slack, floppy mass that spreads sideways instead of rising upwards. The right balance gives you dough that stretches smoothly during a coil fold, holds its shape when you set it down, and opens beautifully along your score in the oven.
What this means for your bake
If your dough is constantly snapping back and tearing when you try to shape it, you need more rest time, not more working. Bench rest is not optional padding in a recipe. It genuinely relaxes the gluten and makes the dough extensible enough to shape properly. Five minutes more bench rest often fixes what people think is a technique problem.
How Fermentation Changes the Gluten Network
This is the bit most people miss. Gluten development is not just about mixing and folding. Fermentation actively changes the structure of your gluten network over the course of bulk fermentation, and it does so in ways that can work for you or against you depending on how you manage it.
As your starter gets to work, it produces organic acids, mainly lactic and acetic acid. These acids strengthen gluten bonds up to a point, which is part of why a long cold proof often produces a better loaf than a quick room-temperature one. The extended acidic environment helps the network firm up.
But push fermentation too far, and those same acids start to break the network down. Over-fermented dough feels sticky, slack, and almost gummy. It tears instead of stretching. The gas has nowhere to hold, the structure collapses, and you end up with a flat, dense loaf with a gummy crumb. Sound familiar? That is not a shaping problem. That is a gluten degradation problem, caused by going too long in bulk.
What this means for your bake
Watch your dough, not just the clock. In spring and summer, bulk fermentation moves faster. The dough that needed eight hours on your bench in January might be done in five or six by May. If it starts feeling very soft, almost slack, and your stretch-and-fold sets are losing tension rather than building it, that is your signal to move on to shaping.
Why Coil Folds and Stretch-and-Folds Actually Work
People sometimes wonder whether the folding you do during bulk fermentation is strictly necessary, or just a sourdough ritual. The science is pretty clear: it matters.
When you perform a coil fold or a set of stretch-and-folds, you are doing two things simultaneously. You are physically aligning the gluten strands into a more organised network, and you are degassing the dough slightly and redistributing the temperature so fermentation stays consistent throughout the mass rather than running hotter in the middle.
That organised network is what gives you the tension you feel in a well-shaped loaf, the kind that holds a tight round on the bench and rises upward rather than outward. The difference between a loaf with good oven spring and one that just spreads is often down to how well that internal gluten structure was built during bulk.
I usually put on something long in the background when I am doing a bulk ferment at home, a few hours of house music works perfectly, because the rhythm of checking in every 30 to 45 minutes for a fold set actually suits the pace of it. There is something satisfying about feeling the dough tighten up across three or four sets.
What this means for your bake
Four sets of coil folds across the first two hours of bulk fermentation is a solid general approach. After that, let the dough rest undisturbed. Over-folding later in bulk can knock out the gas you have built up and actually weaken structure rather than strengthen it. Build tension early, then leave it alone.
Flour Protein Content Changes Everything
Not all flour builds the same gluten network. Strong bread flour, typically 12 to 14 percent protein, builds a robust, extensible network that can handle long fermentation and high hydration. All-purpose or plain flour at 10 to 11 percent protein builds a softer network, better suited to lower hydration doughs or enriched breads.
Whole wheat and rye flours add extra complexity. The bran particles in whole grain flours physically cut through gluten strands as they develop, which is why 100 percent whole wheat dough feels nothing like strong white bread flour dough. This is also why whole grain loaves tend to be denser: the gluten network simply cannot hold as much gas because it keeps getting interrupted by those sharp bran edges.
A simple fix is to sift some of the bran out, or more practically, blend your whole grain flour with strong white flour. Fifty-fifty is a good starting point if you want whole grain flavour with reasonable structure.
If you are working through this kind of thing and want proper guidance rather than trial and error, the DoughRise Coach is genuinely useful here. It gives you personalised bake plans and unlimited AI coaching messages, so when your dough behaves unexpectedly, you have somewhere to go with a specific question and get a real answer rather than sifting through generic advice.
The Practical Upshot
Understanding gluten will not instantly make you a better baker, but it will make you a better diagnostician. When something goes wrong, and it will, knowing whether the issue is under-developed structure, over-fermented gluten, the wrong flour, or just a bench rest that was five minutes too short means you can actually fix it next time instead of just hoping it comes out better.
Spring is a great time to pay attention to all of this. Your doughs are going to behave differently over the next few months. That is not a problem, it is just the season doing its thing. Lean into it.
Quick Questions
Can you over-develop gluten in sourdough by folding too much?
Yes, though it is more common to over-ferment than to over-fold. Too many fold sets late in bulk fermentation can degas the dough and actually reduce oven spring. Build tension in the first half of bulk, then let the dough rest.
Why does my dough feel strong after folding but then get slack before I shape it?
That is usually a sign fermentation has gone a bit too far. The organic acids produced by your starter eventually break down gluten bonds rather than strengthening them. If your dough feels noticeably weaker and stickier towards the end of bulk, move to shaping sooner next time.
Does gluten development matter if I am making a low-hydration dough?
Absolutely. Lower hydration doughs actually need good gluten development even more in some ways, because there is less water to create extensibility naturally. Proper mixing and adequate rest time are just as important as they are in a high-hydration loaf.
Happy baking! Find everything you need at doughrise.store
Photo by Benjamin Jauregui on Unsplash