Altering the fat content affects flavor release in a model yogurt system

Area of Science:

• Food Science
• Sensory Science
• Analytical Chemistry

Background:

• Understanding flavor release from dairy products is crucial for food product development.
• Yogurt's texture and composition, particularly fat content, are known to influence sensory perception.
• Real-time analysis of volatile compounds offers insights into dynamic flavor release mechanisms.

Purpose of the Study:

• To investigate the impact of varying fat content on the real-time release of flavor volatiles from yogurt.
• To correlate instrumental measurements of volatile release with sensory perception of flavor.
• To elucidate the relationship between yogurt rheology and flavor volatile dynamics.

Main Methods:

• Yogurts with different fat percentages (0.2%, 3.5%, 10%) were analyzed.
• Flavor volatile release was monitored in real-time using atmospheric pressure ionization mass spectrometry (API-MS) of nasal air.
• Rheological properties (viscosity, particle size) and sensory assessments were conducted.

Main Results:

• Low-fat yogurts (0.2%) exhibited faster and higher intensity volatile release compared to higher fat content yogurts.
• Increasing fat content correlated with higher viscosity and lower particle size.
• Lipophilic compounds' maximum volatile intensity was affected by fat content, but timing and persistence were not.
• Sensory analysis confirmed differences in flavor intensity and speed of onset, but not duration.

Conclusions:

• Fat content significantly influences the kinetics and intensity of flavor volatile release from yogurt.
• The interplay between yogurt's physical properties (fat, viscosity) and volatile release impacts flavor perception.
• API-MS provides a valuable tool for real-time characterization of flavor release in complex food matrices.