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Related Experiment Video

Updated: Jul 4, 2026

Embedded Bioprinting of Tissue-like Structures Using κ-Carrageenan Sub-Microgel Medium
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Diffusion in kappa-carrageenan gel beads.

A L Nguyen1, J H Luong

  • 1Biotechnology Research Institute, National Research Council of Canada, Montreal, Quebec, Canada.

Biotechnology and Bioengineering
|August 1, 1986
PubMed
Summary

Glucose diffusion in kappa-carrageenan gel beads is influenced by concentration, temperature, and polymer levels. Other solutes like electrolytes can enhance or hinder glucose diffusion, impacting transport properties.

Area of Science:

  • Food Science
  • Biomaterials Science
  • Chemical Engineering

Background:

  • Carrageenan gels are widely used in food and pharmaceutical industries.
  • Understanding solute diffusion within these gels is crucial for product development and process optimization.
  • Previous studies have explored diffusion in hydrogels, but specific factors affecting carrageenan require further investigation.

Purpose of the Study:

  • To experimentally investigate the diffusion characteristics of various solutes into spherical kappa-carrageenan gel beads.
  • To determine the impact of glucose concentration, temperature, and polymer concentration on glucose diffusivity.
  • To assess the influence of co-present solutes (electrolytes, amino acids, proteins) on glucose diffusion.

Main Methods:

  • Diffusion experiments were conducted in a well-mixed, temperature-controlled vessel.

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  • Spherical kappa-carrageenan gel beads were prepared with varying polymer concentrations.
  • The diffusion coefficient of glucose was measured under different glucose concentrations, temperatures, and in the presence of other solutes.
  • The diffusion of larger molecules like bovine serum albumin was also assessed.

    • Main Results:

    • Glucose diffusivity was significantly affected by glucose concentration and temperature.
    • Diffusivity within the gel beads was lower compared to glucose in pure water.
    • An inverse relationship was observed between glucose diffusivity and kappa-carrageenan polymer concentration.
    • Electrolytes (ammonium sulfate, KCl, CaCl2) increased glucose diffusivity, while arginine and bovine serum albumin decreased it.
    • Bovine serum albumin did not diffuse into the gel beads, indicating significant mass transfer resistance.

    Conclusions:

    • Glucose diffusion in kappa-carrageenan gels is a complex process influenced by multiple factors.
    • Gel matrix properties (polymer concentration) and solution conditions (solute type, concentration, temperature) play critical roles.
    • The findings provide valuable insights for designing and controlling diffusion processes involving carrageenan-based systems.