The Science Behind Village Bakery: Dough Fermentation and Bread Baking

Yeast Fermentation and CO2 Production

During dough fermentation, yeast cells consume sugars to produce energy through anaerobic respiration. This process generates carbon dioxide (CO2) as a byproduct. The CO2 forms bubbles in the dough, causing it to rise and become light and airy.

The rate of fermentation is influenced by factors such as temperature, pH, and the presence of nutrients like sugars. Yeast activity peaks at around 30°C, but can still occur over a wide range from 15°C to 40°C.

Heat Transfer in Wood-Fired Brick Ovens

In a wood-fired brick oven, heat is transferred primarily through conduction and radiation. The bricks act as thermal mass, absorbing the heat from the fire and slowly releasing it into the dough. This slow release of heat helps to create an even bake and promotes Maillard browning on the surface.

The evaporation front, where water transitions from liquid to gas, also plays a crucial role in heat transfer. As water evaporates, it carries away latent heat, which can affect the overall temperature distribution within the dough.

Bread Baking and Maillard Browning

During baking, the proteins and reducing sugars in the dough undergo a series of chemical reactions known as the Maillard reaction. This process creates complex flavor compounds and gives bread its distinctive brown color and rich aroma.

The timing and temperature of baking are critical for achieving optimal results. The Heisler charts provide a useful guide to determine the appropriate bake time based on the loaf size, with t ~ L^2/α where t is the bake time, L is the characteristic length (e.g., diameter or height), and α is the thermal diffusivity.

Starch Setting and Oven Spring

As bread bakes, the starch granules in the dough gelatinize. This process sets the structure of the bread, giving it its final texture. Oven spring is a phenomenon where the dough expands further during baking due to the release of CO2 trapped within the loaf.

Controlling these processes requires balancing factors such as oven temperature, humidity, and baking time to achieve the desired crumb structure and crust color.

Frequently asked questions

Try it live

Everything above runs in your browser — open Village Bakery: Dough Fermentation, Oven Heat and Bread Baking Lab and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.