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Related Experiment Video

Updated: Feb 11, 2026

Cryopreservation of Mouse Embryos by Ethylene Glycol-Based Vitrification
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Mouse Embryo Cryopreservation by High-Osmolality Vitrification.

Keiji Mochida

    Cold Spring Harbor Protocols
    |May 3, 2018
    PubMed
    Summary

    High-osmolality vitrification (HOV) offers a simple, effective method for embryo cryopreservation. This technique allows embryos to survive storage in liquid nitrogen and temporary holding at -80°C, enhancing handling and transport flexibility.

    Area of Science:

    • Embryology
    • Cryobiology
    • Reproductive Medicine

    Background:

    • Conventional vitrification involves nonequilibrium conditions and supercooling.
    • Equilibrium vitrification methods offer potential improvements in cryopreservation.

    Purpose of the Study:

    • To present a refined equilibrium vitrification protocol using high osmolality.
    • To evaluate the efficacy and advantages of the high-osmolality vitrification (HOV) method.

    Main Methods:

    • Development of an equilibrium vitrification solution with high cryoprotectant concentration and osmolality.
    • Application of the HOV method to embryos for cryopreservation.
    • Testing survival rates after storage in liquid nitrogen and temporary holding at -80°C.
    • Comparison with conventional vitrification methods.

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    Modified MicroSecure Vitrification: A Safe, Simple and Highly Effective Cryopreservation Procedure for Human Blastocysts
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    Main Results:

    • The HOV method allows vitrified embryos to survive storage in liquid nitrogen (-196°C) and temporary holding at -80°C for at least 5 months.
    • HOV provides high postwarming survival rates, comparable to conventional vitrification.
    • Advantages include reduced damage during handling, flexibility for temporary storage at -80°C, easier sample arrangement, and transportability using dry ice.
    • An alternative protocol using straws instead of cryotubes is presented.

    Conclusions:

    • High-osmolality vitrification is a simple and effective method for embryo cryopreservation.
    • HOV enhances the practicality and safety of embryo cryopreservation, offering significant advantages over conventional methods.