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Related Experiment Videos

Some microbiological aspects of inedible rendering processes.

P I Hansen, K Olgaard

    Zentralblatt Fur Bakteriologie, Mikrobiologie Und Hygiene. 1. Abt. Originale B, Hygiene
    |December 1, 1984
    PubMed
    Summary

    This study determined thermal death graphs and heat transmission for rendering processes. Optimized rendering conditions, like particle size and temperature, can ensure bacterial safety in inedible products.

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    Area of Science:

    • Food science and technology
    • Microbiology
    • Chemical engineering

    Background:

    • Inedible rendering processes require robust bacteriological safety standards.
    • Existing rendering legislation needs updating based on scientific data.
    • Understanding microbial inactivation under rendering conditions is crucial.

    Purpose of the Study:

    • To establish a scientific basis for updated rendering legislation.
    • To determine thermal death characteristics of key bacterial spores.
    • To investigate heat transmission in animal tissues during rendering.

    Main Methods:

    • Determined thermal death (TD)-graphs for Bacillus cereus and Clostridium perfringens spores.
    • Developed heat transmission equations for animal tissues, particularly bones.
    • Validated theoretical calculations with experimental data using inoculated steel tubes inserted in bones.

    Main Results:

    • Predrying (45 min) followed by cooking (125°C for 15 min) ensures destruction of non-sporeforming bacteria and Bacillus anthracis spores in 70 mm bone particles.
    • Reducing particle size to <40 mm improves reduction of heat-resistant clostridia spores.
    • Sterility in wet rendering systems (with moisture) is achieved at 110-120°C, while fat-only cooking requires ~140°C.

    Conclusions:

    • Rendering processes can be optimized for bacteriological safety through controlled particle size and thermal treatment.
    • Moisture presence significantly enhances microbial inactivation during rendering.
    • The findings support the development of flexible and modern rendering legislation.

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