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Pepsin diffusion in dairy gels depends on casein concentration and microstructure
J Thévenot1, C Cauty1, D Legland2
1STLO, UMR 1253, INRA, Agrocampus Ouest, Rennes, France.
Food Chemistry
|January 11, 2017
Summary
This study quantifies pepsin diffusion in dairy gels for the first time, revealing its dependence on casein concentration and microstructure. These findings are crucial for understanding food digestion in the stomach.
Area of Science:
- Food Science
- Biophysics
- Dairy Science
Background:
- Gastric digestion research primarily focused on acid diffusion, neglecting pepsin diffusion dynamics.
- Limited data exists on how pepsin moves within food matrices during digestion.
Purpose of the Study:
- To quantify pepsin diffusion in rennet gels.
- To investigate the relationship between gel microstructure and pepsin diffusion.
- To provide essential data for mathematical models of gastric food degradation.
Main Methods:
- Utilized fluorescence recovery after photobleaching (FRAP) to measure diffusion coefficients (D) of fluorescein isothiocyanate (FITC)-pepsin.
- Varied casein concentrations to create rennet gels with distinct protein aggregate structures.
- Employed electron microscopy image analysis to characterize gel microstructures.
Main Results:
- Pepsin diffusion coefficients (D) were successfully measured in rennet gels.
- Pepsin diffusion was found to be dependent on casein concentration and the resulting gel microstructure.
- Polymer science models can effectively assess diffusion in dairy gels.
Conclusions:
- This study pioneers the quantification of pepsin diffusion in dairy products.
- Understanding pepsin diffusion is vital for modeling gastric digestion and food breakdown.
- Data generated can inform more accurate predictions of food degradation in the stomach.
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