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Ionic diffusion in frozen starch gels.

S Charoenrein1, D S Reid

  • 1Department of Food Science and Technology, University of California, Davis 95616.

Advances in Experimental Medicine and Biology
|January 1, 1991
PubMed
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Food quality changes during freezing depend on ice crystal structure. Faster freezing creates smaller ice crystals, impacting ion diffusion rates and food quality at different temperatures. This research used a starch gel model.

Area of Science:

  • Food Science
  • Physical Chemistry
  • Materials Science

Background:

  • Food quality is affected by freezing conditions and storage temperatures.
  • Understanding ion diffusion in frozen food models is crucial for predicting quality changes.
  • A frozen starch gel system was used to model frozen food matrices.

Purpose of the Study:

  • To investigate the impact of freezing rates and temperatures on ion diffusion in a frozen starch gel model.
  • To correlate effective diffusion rates with the unfrozen portion and ice crystal structure.
  • To understand the movement of zinc ions (Zn+2) within frozen food models.

Main Methods:

  • Utilized a frozen starch gel model to represent a frozen food matrix.
  • Determined effective diffusion rates of zinc ions (Zn+2) at -8°C and -15°C.

Related Experiment Videos

  • Analyzed ion diffusion using atomic absorption and sample structure via scanning electron microscopy.

    • Main Results:

    • Effective diffusion rates correlated with the unfrozen portion of the starch gel.
    • Ion movement was primarily observed in the unfrozen regions surrounding ice crystals.
    • Significant differences in diffusion rates were noted between fast- and slow-frozen samples at -15°C.
    • Zinc ion diffusion was slower at -15°C compared to -8°C.

    Conclusions:

    • The unfrozen portion of frozen food is the primary pathway for ion diffusion.
    • Ice crystal size and orientation, influenced by freezing rates, affect ion diffusion.
    • Storage temperature significantly impacts the rate of ion diffusion in frozen foods.