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Semipermeable membrane techniques in quantitative enzyme histochemistry.

A E Meijer

    Ciba Foundation Symposium
    |January 1, 1979
    PubMed
    Summary
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    Enzyme diffusion during histochemical staining is prevented using a semipermeable membrane. This method enhances enzyme activity localization and is suitable for quantitative studies.

    Area of Science:

    • Histochemistry
    • Enzymology
    • Biochemistry

    Background:

    • Enzymes can diffuse out of tissue sections during histochemical incubation, leading to inaccurate localization and quantification.
    • Standard fixation methods and the addition of macromolecular substances to incubation media offer only partial solutions to enzyme diffusion.

    Purpose of the Study:

    • To introduce and evaluate a novel histochemical technique that prevents enzyme diffusion from tissue sections.
    • To assess the suitability of this method for quantitative histochemical studies of enzyme activity.

    Main Methods:

    • A semipermeable membrane with a molecular weight cutoff of 20,000 Daltons was interposed between the tissue section and the incubation solution.
    • This membrane allows small molecules (substrates, reaction components) to pass through but retains larger enzyme molecules within the tissue.

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    Main Results:

    • The semipermeable membrane effectively prevented the diffusion of enzymes from tissue sections during histochemical incubation.
    • Substrates and other necessary reagents could freely diffuse through the membrane, enabling successful staining reactions.
    • The technique demonstrated suitability for histochemical demonstration of oxidoreductases, transferases, hydrolases, and isomerases.

    Conclusions:

    • The interposition of a semipermeable membrane is a highly effective method for preventing enzyme diffusion in histochemistry.
    • This technique preserves enzyme localization and shows promise for quantitative histochemical analysis of enzyme activity.