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The mystery of the frozen M-K medium

J McGee, J D Lanier

    Ophthalmic Surgery
    |September 1, 1980
    PubMed

    Insights

    To prevent freezing of donor corneal tissue in M-K medium during transport, use partially melted ice. This ensures the medium stays at the optimal 4°C for up to 24 hours in insulated containers.

    Area of Science:

    • Ophthalmology
    • Biomedical Engineering
    • Cryobiology

    Background:

    • Donor corneal tissue preservation is critical for transplantation.
    • M-K medium is a standard storage solution for ocular tissues.
    • Maintaining a specific temperature range (4°C) is essential for tissue viability.

    Purpose of the Study:

    • To investigate optimal methods for transporting donor corneal material in M-K medium.
    • To prevent freezing injury to corneal tissue during cold storage and transport.
    • To ensure the integrity of M-K medium during transit.

    Main Methods:

    • Corneal tissue transport simulation using M-K medium in insulated containers.
    • Utilizing different ice conditions (solid, partially melted) for temperature maintenance.
    • Monitoring M-K medium temperature over a 24-hour period.

    Main Results:

    • Solid ice colder than 0°C in insulated containers can cause M-K medium to freeze.
    • Partially melted ice with a glistening, wet surface maintains a stable 4°C.
    • M-K medium at 4°C remained viable for approximately 24 hours when stored with partially melted ice.

    Conclusions:

    • Proper ice preparation is crucial for preventing freezing of M-K medium.
    • Partially melted ice is recommended for maintaining the optimal temperature for donor corneal storage.
    • This method ensures the safe transport and storage of donor corneal material for transplantation.

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