Protein Denaturation and Texture Analysis for Chicken

Significance of the Topic

The texture and protein denaturation behavior of chicken breast significantly influence its sensory quality, juiciness and mouthfeel. Understanding how heating time and temperature affect the structural changes in muscle proteins and the resulting mechanical properties supports optimization of cooking processes in food production and culinary applications.

Study Objectives and Overview

This study evaluates the relationship between protein denaturation and textural properties of fried chicken breasts subjected to varying heat‐retention times. Differential scanning calorimetry (DSC) was used to identify thermal transitions of muscle proteins, while a precision universal testing machine assessed hardness and elasticity under different post‐frying holding durations.

Methodology

• Chicken breasts were seasoned and fried until the core temperature reached 70 °C, then held at that temperature for 0 min, 1 h, 2 h or 4 h.
• Samples were shock‐frozen, thawed, and examined by DSC at a heating rate of 10 °C/min in sealed aluminum pans.
• Texture analysis employed orthogonal shear tests with a 1 kN load cell, tooth‐shaped probe, 750 mm/min speed, 5 mm indentation, and two compression cycles.

Used Instrumentation

• Shimadzu DSC system for thermal analysis of protein denaturation.
• AGS-X universal testing machine with TRAPEZIUMX software for texture measurements.
• Shock freezer for rapid sample stabilization.

Results and Discussion

• DSC profiles of raw chicken revealed three endothermic peaks at approx. 57 °C, 64 °C and 78 °C, corresponding to denaturation of myosin, connective tissue, and actin, respectively.
• After heat retention, the actin denaturation peak (~77 °C) remained for up to 1 h but disappeared after 2 h and 4 h, indicating progressive protein unfolding and moisture loss.
• Texture tests showed hardness increasing from 8.9 N (0 min) to 32.8 N (4 h) and elasticity rising from 1.33 to 5.72 over the same intervals, reflecting firmer, drier meat with prolonged holding.

Benefits and Practical Applications

• Provides quantitative data linking thermal treatment to textural quality, aiding process engineers in optimizing frying and holding protocols.
• Helps food manufacturers balance juiciness and firmness for consistent product quality.
• Offers benchmarks for designing cooking equipment and setting quality control parameters in industrial kitchens.

Future Trends and Applications

• Integration of real‐time thermal imaging and DSC data with predictive modeling to tailor cooking curves.
• Use of advanced rheological measurements and microstructural imaging to correlate nanoscale protein changes with sensory attributes.
• Development of automated cooking systems that adjust holding times based on continuous texture feedback.

Conclusion

The combined DSC and texture analysis demonstrated that extended heat retention leads to complete protein denaturation and markedly increased hardness and elasticity in fried chicken. These insights can guide optimized cooking and holding strategies to achieve desired sensory qualities.