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Related Experiment Videos

Solubility and diffusion of nitrogen in maltodextrin/protein tablets.

Annemarie Schoonman1, Job Ubbink, Chris Bisperink

  • 1Nestlé Research Center, CH-1000 Lausanne 26, Switzerland.

Biotechnology Progress
|February 2, 2002
PubMed
Summary

Nitrogen gas solubility and release from maltodextrin-caseinate tablets depend on matrix free volume and microstructure. Gas release below the glass transition temperature follows Fickian diffusion, allowing prediction of nitrogen retention.

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Area of Science:

  • Food science and material science
  • Physical chemistry of polymers and amorphous solids

Background:

  • Understanding gas transport in amorphous solid matrices is crucial for food processing and packaging.
  • Maltodextrin and sodium caseinate mixtures form amorphous matrices with tunable properties.

Purpose of the Study:

  • To investigate nitrogen gas transport properties in compacted amorphous maltodextrin-sodium caseinate tablets.
  • To determine the influence of temperature, water activity, and processing conditions on gas solubility and release.

Main Methods:

  • Dissolving nitrogen gas into tablets under elevated temperature and pressure.
  • Measuring gas release over time at various temperatures and water activities.
  • Analyzing gas solubility based on matrix free volume and packing density.

Related Experiment Videos

  • Modeling gas release using Fickian diffusion principles.

    • Main Results:

    • Nitrogen solubility is primarily governed by the free volume of the amorphous matrix.
    • Gas release below the glass transition temperature is well-described by Fickian diffusion.
    • The effective diffusion coefficient is sensitive to tablet microstructure and porosity.
    • A model correlating tablet structure with gas release rate was developed.

    Conclusions:

    • Thermal and pressure treatments during gas loading influence matrix free volume and nitrogen solubility.
    • Gas diffusion in these tablets is predictable using Fickian models below the glass transition temperature.
    • The study provides a framework for predicting nitrogen retention in amorphous solid systems.