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Related Experiment Videos

Two-dimensional diffraction study of ice crystallisation in polymer gels.

Norio Murase1, Satoru Abe, Hiroshi Takahashi

  • 1Department of Biotechnology, School of Science and Engineering, Tokyo Denki University, Hatoyama, Hiki-gun, Saitama 350-0394, Japan. nmurase@b.dendai.ac.jp

Cryo Letters
|June 25, 2004
PubMed
Summary

Ice crystallization in Sephadex gels forms small crystals, not glass transitions. Gel crosslinking density influences ice crystal size and dimensions during freezing.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Biomaterials

Background:

  • Understanding ice crystallization in hydrogels is crucial for cryopreservation and freeze-drying applications.
  • Crosslinked dextran (Sephadex) gels are widely used in chromatography and drug delivery, making their behavior under freezing conditions relevant.

Purpose of the Study:

  • To investigate the process of ice crystallization within crosslinked dextran (Sephadex) gels.
  • To determine the relationship between gel crosslinking density and the characteristics of formed ice crystals.
  • To clarify the thermal events observed during the rewarming of frozen Sephadex gels.

Main Methods:

  • Simultaneous measurement using two-dimensional X-ray diffraction (XRD) and differential scanning calorimetry (DSC).
  • Analysis of XRD patterns to characterize ice crystal size and morphology.

Related Experiment Videos

  • Interpretation of DSC thermograms to identify thermal transitions during rewarming.

    • Main Results:

    • XRD patterns revealed the formation of small ice crystals (<10 microns) in Sephadex G25 gels during freezing.
    • DSC analysis indicated that the endothermic peak prior to the main exotherm corresponds to the melting of these small ice crystals, not a glass transition.
    • The crosslinking density of the Sephadex gel significantly influenced the size and dimensions of the ice crystals formed.

    Conclusions:

    • Ice crystallization in Sephadex gels produces small crystals, and the observed endotherm is due to their melting.
    • The degree of crosslinking in dextran gels is a critical factor controlling ice crystal formation.
    • These findings provide insights into the physical behavior of hydrogels under cryogenic conditions.