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Related Experiment Videos

Freeze-drying of histocompatibility typing sera.

V P Perry, C A Kroener, J L Martin

    Developments in Biological Standardization
    |October 1, 1976
    PubMed
    Summary

    Freeze-drying histocompatibility sera using a new unit preserves typing factors for over five years when stored below 4°C. Residual moisture below 2% is critical for maintaining serum solubility and efficacy.

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    Area of Science:

    • Biotechnology
    • Immunology
    • Biochemistry

    Background:

    • Histocompatibility typing sera are crucial for tissue typing and transplantation.
    • Effective preservation methods are needed to maintain the stability and efficacy of these sera over time.
    • Freeze-drying (lyophilization) is a common technique for stabilizing biological products.

    Purpose of the Study:

    • To describe a novel unit designed for the freeze-drying of histocompatibility typing sera.
    • To evaluate the impact of residual moisture and storage temperature on the long-term stability of freeze-dried histocompatibility sera.
    • To determine optimal storage conditions for maintaining the integrity of tissue typing factors.

    Main Methods:

    • A specialized freeze-drying unit with a 50-hour cycle was employed, processing approximately 3,200 3-ml vials.
    • Condensers were maintained below -60°C using dry ice-alcohol baths, and shelf-cooling baths controlled product temperature.
    • A 5-year study assessed the effect of residual moisture and storage temperatures (+4°C, +37°C, and higher) on serum stability.

    Main Results:

    • Freeze-dried histocompatibility sera with residual moisture below 2% retained significant tissue typing factors after 5 years of storage at +4°C.
    • Serum solubility was completely lost in samples stored at +37°C or higher for the same 5-year period.
    • The freeze-drying unit achieved a final residual moisture content of less than 2%.

    Conclusions:

    • The developed freeze-drying unit and process effectively preserve histocompatibility typing sera.
    • Maintaining a residual moisture content below 2% is essential for the long-term stability of freeze-dried sera at refrigerated temperatures (+4°C).
    • Storage at elevated temperatures (+37°C and above) leads to irreversible loss of serum function and solubility.

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