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Related Experiment Videos

Rapid contrasting of extracellular elements in thin sections.

K P Dingemans1, M A van den Bergh Weerman

  • 1Department of Pathology, University of Amsterdam, The Netherlands.

Ultrastructural Pathology
|November 1, 1990
PubMed
Summary

This study introduces a simple tannic acid prestaining method to enhance contrast in extracellular tissue components for electron microscopy. This technique also improves intracellular glycogen electron density and can be used as an elastin stain.

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Area of Science:

  • Electron Microscopy
  • Biochemistry
  • Histology

Background:

  • Standard electron microscopy staining methods poorly contrast extracellular components.
  • Extracellular elements often remain electron-lucent or fail to react with stains.
  • Improved contrast is needed for detailed analysis of extracellular matrix and tissue structures.

Purpose of the Study:

  • To develop a method for uniformly high contrast of extracellular tissue components in electron microscopy.
  • To enhance the electron density of intracellular glycogen.
  • To evaluate tannic acid as a prestaining agent for electron microscopy.

Main Methods:

  • A brief prestaining of grids with diluted tannic acid in distilled water was employed.
  • The method was applied to various tissue samples for electron microscopy examination.

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  • Different concentrations of tannic acid were tested to assess their effect on electron density.

    • Main Results:

    • The tannic acid prestaining method rendered uniformly high contrast to extracellular tissue components.
    • Intracellular glycogen electron density was significantly enhanced.
    • Higher concentrations of tannic acid increased electron density, particularly for elastin, indicating its utility as an elastin stain.

    Conclusions:

    • Tannic acid prestaining is a simple, rapid, and versatile method for improving electron microscopy contrast of extracellular elements.
    • The technique offers an additional benefit of enhancing intracellular glycogen visibility.
    • This method is suitable for routine application across diverse tissue samples and can serve as a specific elastin stain.