Relationship between nitrogen functionality and wheat flour dough rheology: Extensional and shear approaches

Area of Science:

• Agricultural Science
• Food Science
• Biochemistry

Background:

• Nitrogen fertilization is crucial for wheat yield but raises environmental concerns regarding greenhouse gas emissions.
• Nitrogen significantly influences wheat grain protein content and composition, affecting food quality, security, and dough rheology.
• Understanding nitrogen's impact on wheat protein is vital for optimizing crop management and food processing.

Purpose of the Study:

• To review the relationship between nitrogen fertilization, wheat protein content, and gliadin-to-glutenin ratios.
• To assess how protein content and gliadin-to-glutenin ratios influence dough rheological properties (shear and extensional).
• To elucidate nitrogen's direct role in wheat flour dough behavior during processing.

Main Methods:

• Critical assessment of recent studies on nitrogen fertilization in wheat.
• Analysis of the effects of varying protein content and gliadin-to-glutenin ratios on dough rheology.
• Review of literature linking nitrogen uptake to changes in wheat protein quantity and composition.

Main Results:

• Nitrogen uptake by wheat increases grain protein content and alters the gliadin-to-glutenin ratio.
• Higher wheat protein content generally correlates with increased gliadin-to-glutenin ratios.
• Increased protein content and gliadin-to-glutenin ratios result in more extensible wheat flour doughs.

Conclusions:

• Nitrogen fertilization directly impacts wheat protein content and composition, influencing dough rheology.
• Dough extensibility is enhanced by higher protein content and gliadin-to-glutenin ratios, a common outcome of nitrogen fertilization.
• This relationship underscores nitrogen's critical role in wheat quality and processing characteristics, despite confounding factors.