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Related Experiment Videos

[Isolation of proteins with complex forming agents].

K D Schwenke, B Raab, B Ender

    Die Nahrung
    |January 1, 1975
    PubMed
    Summary

    Researchers developed methods to isolate proteins that are difficult to precipitate using tannin or poly-anions. These techniques achieve 100% protein yield and offer new possibilities for protein extraction and purification.

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    Area of Science:

    • Biochemistry
    • Protein Chemistry

    Background:

    • Isoelectric precipitation is a common method for protein isolation.
    • Some proteins, like vegetable albumins, cannot be effectively precipitated isoelectrically.
    • Alternative methods are needed for efficient isolation of these challenging proteins.

    Purpose of the Study:

    • To investigate methods for isolating proteins that are not amenable to isoelectric precipitation.
    • To explore the use of tannin and poly-anions for protein complex formation and isolation.
    • To optimize conditions for high-yield protein recovery.

    Main Methods:

    • Utilized vegetable albumins as model proteins.
    • Employed tannin and poly-anions (dextran sulfate, polyphosphates) to form protein complexes.
    • Investigated the influence of pH and electrolyte concentration on precipitation.
    • Developed methods for protein recovery from tannin and poly-anion complexes.

    Main Results:

    • Proteins were successfully isolated by forming complexes with tannin or poly-anions.
    • Precipitation with poly-anions depended on pH and electrolyte content.
    • Complete protein precipitation was achieved with tannin across a wide pH range.
    • 100% protein yields were obtained under optimized experimental conditions.
    • Effective methods for isolating protein from complexes using salt, thermal coagulation, or coffeine were demonstrated.

    Conclusions:

    • Complexation with tannin and poly-anions provides an effective alternative for isolating proteins resistant to isoelectric precipitation.
    • The described methods allow for high-yield recovery of valuable proteins.
    • These techniques offer new avenues for protein purification and analysis in various applications.

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