Fermentation, Proofing, and Baking Technology
Fermentation, proofing and baking technology covers how yeast and bacteria produce gas and flavour, how to control the rate, and how the oven turns proofed dough into a finished product.
Fermentation
Yeast converts sugars to carbon dioxide and ethanol; lactic and acetic bacteria in sourdough produce acids that strengthen and flavour. Salt, temperature and inoculation percentage set the pace. Preferments: poolish at 100% hydration, biga at 50–60%, both adding flavour and tolerance.
Proofing
Final proof is usually 24–28 °C at 75–85% relative humidity. The poke test - a light, flour-dusted finger press that springs back slowly and incompletely - beats a timer. Underproofed dough tears at the side; overproofed dough collapses and loses oven spring.
Baking
Oven spring comes from expanding gas and steam before the crust sets. Steam in the first 8–12 minutes keeps the surface flexible; dry heat then browns the crust through Maillard reactions and caramelization. Carryover baking continues after unloading.
Worked example
A dough ferments in 4 hours at 20 °C. Fermentation roughly doubles per 8–10 °C rise, so at 28–30 °C it needs about 2 hours. If production needs a 12-hour window instead, chill to 4–6 °C after bulk and retard; cold slows yeast far more than enzyme activity, so flavour keeps developing.
Traps
Judging proof by time alone; proofing above 30 °C so butter in laminated doughs melts; not tempering dough from the retarder before shaping; and opening the oven early, which drops the temperature and stalls oven spring.