Lessons E08 The pH of Sourdough | Microbiology, Fermentation & Whole Grain
Send us a question or voice memo! pH is one of the topics I’m asked about most often, but the number on a meter is only one part of understanding fermentation. In Lessons E08 of Saving Bread, I break down what is happening inside a sourdough culture and explain how I use pH in my own baking and production. We talk about the relationship between yeast and lactic acid bacteria, the enzymes naturally present in flour, how starch becomes available to microorganisms during fermentation, why organic acids cause pH to fall, and what happens to dough structure as fermentation continues. I also walk through the actual pH ranges I use for my country bread and higher whole grain doughs, from levain maturity through bulk fermentation, shaping, cold retard, and baking. These are not universal targets. They are examples of how I use pH alongside dough temperature, time, flour choice, expansion, structure, and experience to make fermentation decisions. In this episode: • What yeast and lactic acid bacteria are doing during sourdough fermentation • How amylase and other flour enzymes affect fermentation • What pH actually measures • pH versus total titratable acidity, or TTA • Why whole grain flour has greater buffering capacity • How I evaluate levain maturity • Protease activity and changes in dough strength • My pH checkpoints for country bread and high whole grain bread • Why fermentation continues after dough enters the refrigerator • Why a lower pH does not necessarily mean a bread will taste more sour • What sourdough fermentation does and does not do to gluten • Why pH targets should be developed around your own flour, formula, temperature, and process You do not need a pH meter to make good bread. For me, it has become a useful way to record fermentation, repeat results, and connect measurable data with what I can already see and feel in the dough. The goal is not to chase one perfect number. It is to better understand the dough in front of you. Resources mentioned in this episode Hanna Instruments Bread & Dough pH Tester Hanna HI981038 Bread & Dough pH Tester San Francisco Baking Institute San Francisco Baking Institute Modern Bread and Viennoiserie at SFBI Modern Bread and Viennoiserie course Follow Allison and Matriarch Bread on Instagram: @matriarchbread Follow Saving Bread wherever you listen to podcasts.
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