With its golden crust, honeycomb crumb, and subtly tangy flavor, sourdough bread is much more than just a baked good. It is ultimately the result of a living ecosystem, shaped by yeast and bacteria working in symbiosis. Among the many factors that influence the quality of this bread, pH plays a key role. So what pH should you aim for to achieve a balanced, digestible, and flavorful sourdough bread? BRO tells you everything you need to know in this new article!
Understanding the role of pH in sourdough bread
The fermentation of sourdough bread relies on the interaction between yeast and lactic acid bacteria. Among other things, these produce lactic acid and acetic acid, which help to lower the pH of the dough. As a reminder, pH measures the acidity of an environment on a scale of 0 to 14: the lower the number, the more acidic the environment.
In the case of sourdough, this acidity is not simply a by-product, but a key regulator of the fermentation process. It influences the growth of microorganisms, enzymatic activity, gluten structure, and bread preservation.
Thus, pH is an indicator of the health of the sourdough, but also an essential control lever for the baker. So, what should the pH of sourdough bread be? Here’s the answer!
What pH level should you aim for in sourdough bread?
In reality, the optimal pH of a mature sourdough starter is between 3.8 and 4.3, depending on the flours used, the frequency of refreshments, and the fermentation temperature. For the bread dough itself, after kneading and before baking, the pH is generally between 4.0 and 4.8. However, once the bread is baked, the final pH of sourdough bread should stabilize between 3.5 and 4.3, giving the crumb its characteristic slight acidity.
Be careful, though, as this figure should never be interpreted in isolation. A pH that is too low, below 3.5, may indicate excessive fermentation, with acidity dominating at the expense of aroma. Conversely, a pH that is too high may indicate a weak, inactive, or even unstable sourdough, resulting in dense, poorly risen bread with little character.
In addition, it should be noted that pH varies depending on several factors:
- The type of flour: wholemeal or semi-wholemeal flours contain more minerals (ash), which influences the buffering capacity of the dough and therefore its resistance to acidification.
- The frequency of refreshments: a sourdough that is refreshed too infrequently becomes more acidic, whereas a sourdough that is refreshed daily remains milder.
- Temperature: the higher the temperature, the faster the fermentation, but also the more acidic it is.
A balanced sourdough bread can be recognized by its organoleptic qualities as well as its stability over time. The pH is the invisible thread that connects these dimensions: taste, texture, preservation, and digestibility.
Would you like to learn how to control this parameter? BRO supports professionals in reading and managing these parameters through training dedicated to sourdough bread making, so that you can clearly understand the interactions involved in the fermentation process and master every step of the production process.
The pH of sourdough bread is not an arbitrary number, but an indicator of the bread’s balance. Aiming for a value between 3.5 and 4.3 will help you achieve a lively, aromatic, and healthy bread. So, to achieve this level of precision, don’t hesitate to sign up for BRO’s sourdough bread training course!
