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Related Experiment Videos

Applying state diagrams to food processing and development.

Y Roos1, M Karel

  • 1Dept. of Food Chemistry and Technology, University of Helsinki, Finland.

Food Technology
|December 1, 1991
PubMed
Summary

The physical state of amorphous food materials, particularly the glass transition temperature (Tg), significantly impacts food properties and stability. Understanding Tg helps predict and prevent deteriorative changes during processing and storage.

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Area of Science:

  • Food science and technology
  • Physical chemistry of food systems
  • Materials science

Background:

  • The physical state of food components is crucial for processing, storage, and consumption.
  • Water removal (evaporation, freezing) and carbohydrate melts often lead to an amorphous food state.
  • The amorphous state is characterized by a glass transition temperature (Tg), marking a shift from glassy to rubbery states.

Purpose of the Study:

  • To investigate phase transitions in amorphous food materials.
  • To correlate the glass transition temperature (Tg) with various food properties.
  • To understand the influence of the amorphous state on food stability and deterioration.

Main Methods:

  • Experimental studies on phase transitions of amorphous food materials.
Keywords:
NASA Discipline Life Support SystemsNASA Discipline Number 61-10NASA Program CELSSNon-NASA Center

Related Experiment Videos

  • Relating glass transition temperature (Tg) to composition, viscosity, stickiness, collapse, and recrystallization.
  • Utilizing state diagrams with experimental and calculated data.

    • Main Results:

    • The glass transition temperature (Tg) is a key indicator of physical and physico-chemical changes in amorphous foods.
    • Increased molecular mobility and free volume above Tg accelerate deteriorative changes.
    • Diffusion-limited reactions are influenced by the physical state near Tg.

    Conclusions:

    • The physical state, especially around Tg, is critical for controlling deteriorative reactions in amorphous foods.
    • State diagrams effectively characterize water content, temperature, and time-dependent phenomena.
    • Understanding these transitions is vital for optimizing food processing and extending shelf life.