pH value and TTA in flour, dough, and bread

Importance of the Topic

Acidity and pH in flour, dough, and bread influence flavor, aroma, texture, and shelf life. Precise monitoring from raw materials through baking ensures consistent product quality and reliable storage stability.

Aims and Study Overview

This work evaluates standardized methods according to AOAC and AACC protocols for measuring pH and total titratable acidity (TTA) in white flour, bread dough, sourdough (wheat and rye), and baked breads. It demonstrates the routine applicability of a compact titration system combined with a portable pH meter.

Methodology

Raw samples were weighed and dispersed in CO₂-free water. Dough and bread samples were homogenized and allowed to equilibrate for 30 minutes. The supernatant was used for immediate pH measurement. TTA was determined by titration to the first equivalence point using 0.1 mol/L NaOH.

Instrumentation Used

• Eco Titrator Acid/Base with integrated magnetic stirrer and preconfigured titration methods
• 913 pH Meter with maintenance-free Ecotrode Gel electrode and integrated Pt1000 temperature sensor
• Polytron homogenizer for sample size reduction

Key Results and Discussion

• Measured pH values (n=6): white flour ~6.19; bread dough ~7.09; wheat sourdough ~5.64; rye sourdough ~4.87; white bread ~5.50; whole wheat bread ~6.10 (relative SD ≤0.3%).
• TTA values per 10 g sample (0.1 mol/L NaOH): white flour ~2.72 mL; dough ~4.18 mL; wheat sourdough ~5.07 mL; rye sourdough ~6.70 mL; white bread ~4.55 mL; whole wheat bread ~3.34 mL (relative SD ≤5.5%).
• Titration curves displayed well-defined endpoints, supporting accurate acidity quantification in all sample types.

Benefits and Practical Applications

Accurate determination of pH and TTA enables bakers and food analysts to standardize fermentation processes, optimize sensory attributes, and predict shelf life. The compact titrator and portable pH meter facilitate rapid quality control in both laboratory and on-site bakery environments.

Future Trends and Potential Applications

Real-time inline sensors for pH and acidity, coupled with automated titration and data analytics, promise enhanced process control and deeper insight into fermentation dynamics. This integration will benefit artisanal and industrial baking alike.

Conclusion

The combination of the Eco Titrator and the 913 pH Meter provides a robust, GLP-compliant solution for precise pH and titratable acidity measurements in flour, dough, and bread. Their ease of use, compact design, and preinstalled methods make them ideal for routine quality assurance in bakeries.

Reference

• AOAC 943.02 Determination of pH in flour
• AOAC 981.12 pH measurement of dough and bread
• AACC 02-31.01 Total Titratable Acidity in Flour and Dough