Fermentation and maturation in pizza dough

Two processes, one dough

When dough rests, two families of changes run side by side:

• fermentation, driven by yeast, which produces the gas and part of the aroma;
• maturation, driven mostly by the flour’s own enzymes, which breaks the dough’s large molecules into simpler ones and improves flavour and texture.

People often talk about one without the other. That is a mistake: in a dough, isolating one from the other is both impossible and wrong. Still, understanding each one helps you steer the whole.

Fermentation: the yeast at work

The yeast used for pizza is a microscopic fungus, Saccharomyces cerevisiae. It feeds on the simple sugars in the dough and produces:

So yeast does more than make dough rise. Through its acids and by-products, it also takes part in maturation and flavour development. Dosage and the different kinds of yeast are covered on the yeast types page.

Acidity in preferments

When fermentation is long and intense, as in a preferment, it builds up noticeable acidity. In a biga, that acidity rises with the amount of yeast, the storage temperature, the amount of water (which amplifies both fermentation and maturation) and time. A poolish produces a different, mainly acetic profile. This acidity is not just about taste: it adds elasticity and strength to the final dough.

Maturation: the enzymes at work

Maturation covers two things: all the enzymatic processes that break the dough’s complex molecules into simpler ones, and all the reactions that improve its flavour and texture. Two families of enzymes do most of the work.

Amylases and damaged starch

Amylases, alpha and beta, break down starch. In doing so they release simple sugars for the yeast (alcoholic fermentation) and for bacteria (lactic fermentation). In other words, maturation feeds fermentation.

There is a limit: they can only attack the starch damaged during milling, roughly 5 to 9 % of the total. Some flours are also "slow" from an enzyme point of view. That is where malt comes in: it brings extra sugars and amylases. I use it, at about 1 % powder or 2 % syrup, with enzymatically slow flours, long fermentations and preferments. A preferment, by fermenting heavily, leaves the dough poorer in sugars and enzyme activity.

Proteases, amino acids and gluten

Proteases break the flour’s proteins down into simple building blocks, amino acids. These "free" amino acids are responsible for much of the dough’s aroma and flavour, notably through the Maillard reaction.

Proteases, along with other molecules, also break down part of the gluten. The direct effect on structure: the dough becomes more extensible over time. A long final proof favours extensibility too, and the longer the rest, the stronger the flour you need to keep some body. More on this in gluten strength and extensibility.

The link with baking

In the oven, two reactions decide the result: full gelatinisation of the starch, for a properly baked, light crust, and the Maillard reaction, for colour. Maillard depends on how much sugar and how many amino acids the dough contains, and that depends on fermentation and maturation. A dough whose fermentation and maturation have not released enough sugars and amino acids will therefore brown less well. The rest happens during baking a Neapolitan pizza.

Temperature controls everything

Both fermentation and maturation are proportional to temperature: as it rises, everything speeds up; as it drops, rising time gets longer.

That is the whole point of a controlled temperature: slowing every reaction down to stretch the rest, gain consistency and give aromas time to develop. It is also why a room-temperature pause before the cold is essential, so fermentation really gets started. Times and temperatures for each stage are in bulk fermentation, balling and final proof and why temperature drives dough.

Other factors affect the speed of both processes: hydration, since more water speeds up fermentation and maturation, and salt, which slows down yeast, enzymes and bacteria.

Why you cannot separate them

Amylases supply the sugars the yeast eats. Yeast produces acids that shape both flavour and structure. Proteases release the amino acids that, together with the remaining sugars, fuel Maillard in the oven, while making the gluten more extensible. And temperature sets the pace of it all.

In a dough, each process feeds the other. That is why I always talk about fermentation and maturation, and why I judge a dough on the balance between volume, structure and flavour, never on a single criterion.