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Related Experiment Video

Updated: Jul 29, 2026

Formulations for Freeze-drying of Bacteria and Their Influence on Cell Survival
08:55

Formulations for Freeze-drying of Bacteria and Their Influence on Cell Survival

Published on: August 3, 2013

Rubber closures for freeze-dried products.

G H Hopkins

    Developments in Biological Standardization
    |October 1, 1976
    PubMed
    Summary

    Selecting appropriate container-closure systems is vital for preserving biological products. Elastomeric materials require specific design and properties, especially for freeze-dried products, to ensure efficacy during storage and administration.

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    Area of Science:

    • Pharmaceutical Science
    • Materials Science

    Background:

    • Container-closure systems are critical for maintaining the efficacy of biological and pharmaceutical products.
    • Elastomeric materials are commonly used, but their suitability depends on specific product requirements.

    Purpose of the Study:

    • To review general requirements for container-closure systems.
    • To discuss the suitability of natural and synthetic elastomers for these systems.
    • To address specialized requirements for freeze-dried products.

    Main Methods:

    • Review of general closure system requirements.
    • Discussion of elastomer properties (MVT, gas transmission).
    • Analysis of elastomer performance at low temperatures, including glass transition points.

    Main Results:

    • Elastomers must provide an effective barrier against moisture vapor transmission.
    • Closure design must allow water vapor outgassing during lyophilization while remaining secure.
    • Elastomer glass transition points are crucial for low-temperature performance.

    Conclusions:

    • Proper selection and design of elastomeric container-closure systems are essential for preserving labile pharmaceutical products, particularly those that are freeze-dried.
    • Material properties like moisture vapor transmission and low-temperature flexibility are key considerations.

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