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The effect of flour water absorption on dough fermentation rate and bread volume
Date: 2025-07-16Read: 0
The water absorption of flour is a core parameter in dough preparation, which directly affects the formation of gluten network, yeast activity, and fermentation gas retention capacity, ultimately determining the volume and texture of bread. Research has shown that water absorption significantly affects fermentation rate and bread quality by regulating the physicochemical properties of dough, and its mechanism of action can be analyzed from the following three aspects.
1、 The effect of water absorption on dough fermentation rate
The essence of dough fermentation is the process in which yeast breaks down sugars to produce CO ₂ and alcohol, and the amount of water absorbed regulates the fermentation rate through a triple mechanism:
Gluten network permeability: Moderate water absorption (usually 55%~65% of flour weight) can form a dense and elastic gluten network, providing sufficient moisture for yeast metabolism and avoiding rapid gas release. Experiments have shown that for every 1% increase in water absorption, the dough fermentation rate (measured by CO ₂ release) increases by about 2% to 3%.
Yeast active environment: Insufficient water absorption (<50%) can lead to dough being too dry, yeast cells becoming dehydrated and dormant, and fermentation rate decreasing; If the water absorption is too high (>70%), it dilutes the sugar concentration and reduces the metabolic efficiency of yeast. Within the optimal water absorption range, yeast enzyme activity reaches its peak and fermentation rate steadily increases.
Temperature conduction efficiency: High water absorption dough has a larger heat capacity, more uniform fermentation temperature, and avoids local overheating that inhibits yeast activity. Comparative experiments have shown that dough with a water absorption of 60% has a 15% to 20% shorter fermentation time than dough with a water absorption of 50%.
2、 The mechanism of water absorption on bread volume
The volume of bread depends on the retention capacity of CO ₂ produced during fermentation, while water absorption determines gas retention efficiency by affecting gluten strength and pore structure
Gluten starch interaction: When the water absorption reaches 60% to 65%, gluten and starch particles form a "skeleton filling" structure, which can support gas expansion while avoiding excessive shrinkage. Insufficient water absorption can lead to loose gluten network and easy gas release; If the water absorption is too high, the dough viscosity will be too high and the gas distribution will be uneven.
Pore uniformity: During the fermentation of high water absorbing dough, the distribution of bubbles is finer (microscopic observation shows a 20%~30% reduction in bubble diameter), and after baking, a uniform pore structure is formed, resulting in a 10%~15% increase in bread volume.
Gas holding stability: Dough with optimized water absorption (62%) has higher pore wall strength and improved resistance to cracking during the baking stage (180 ℃), resulting in a final volume increase of 25% to 30% compared to low water absorption (55%) bread.
3、 Practice optimization suggestions
In actual production, it is necessary to consider the protein content of flour (high protein)Water absorption of flourCan increase by 3%~5%) and dynamically adjust the amount of water added based on environmental temperature and humidity. For example, in low temperature environments during winter, increasing water absorption (+2%) appropriately can compensate for the decrease in yeast activity; When making toast with high gluten flour, controlling the water absorption to 63%~65% can balance the fermentation rate and volume growth.
Water absorption of flourBy regulating the gluten network, yeast activity, and stomatal structure, it becomes the core factor affecting bread fermentation and quality. Accurate control of water absorption (usually 60%~65% of flour weight), combined with process parameter optimization, can significantly improve bread volume and uniformity, providing theoretical basis for industrial production.