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Related Experiment Videos

Tissue fixation with phenol-formaldehyde for routine histopathology.

D Hopwood1, W Slidders, G R Yeaman

  • 1Department of Pathology, Ninewells Hospital and Medical School, Dundee, Scotland, UK.

The Histochemical Journal
|April 1, 1989
PubMed
Summary

Adding phenol to formaldehyde fixative significantly improves tissue preservation for histology and electron microscopy. This enhanced fixation method, buffered phenol-formaldehyde, offers better cellular detail and reduces processing time and artifacts.

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Area of Science:

  • Histopathology
  • Biochemistry
  • Electron Microscopy

Background:

  • Formaldehyde is a common fixative in histology.
  • Limitations of formaldehyde fixation include potential artifacts and suboptimal preservation.
  • Phenol's effect on formaldehyde fixation is not fully understood.

Purpose of the Study:

  • To evaluate the effect of adding phenol to neutral buffered formaldehyde as a fixative.
  • To assess improvements in tissue morphology, processing efficiency, and ultrastructural preservation.
  • To investigate the impact on protein polymer formation and cell volume.

Main Methods:

  • Histopathological tissue processing using buffered phenol-formaldehyde (pH 7.0) and sequential pH buffers.
  • Evaluation of standard histological stains and immunoperoxidase methods.

Related Experiment Videos

  • Ultrastructural analysis of resin-embedded tissue.
  • Gelatin model penetration studies.
  • Polyacrylamide gel electrophoresis for protein polymer analysis.
  • Cell suspension fixation volume change measurements.

    • Main Results:

    • Buffered phenol-formaldehyde (pH 7.0) significantly accelerated fixation and improved nuclear and cytoplasmic detail.
    • Reduced shrinkage, distortion, and formalin pigment were observed.
    • Faster processing times were achieved with sequential pH fixation at elevated temperatures.
    • Satisfactory ultrastructural results were obtained.
    • Enhanced protein polymer formation was observed with buffered phenol-formaldehyde, increasing with time and temperature.
    • Penetration rates and cell volume changes were comparable to neutral buffered formaldehyde.

    Conclusions:

    • Buffered phenol-formaldehyde is a superior fixative for histopathology and electron microscopy.
    • It enhances cellular detail, reduces artifacts, and accelerates processing.
    • The fixative promotes protein polymerization, potentially improving structural integrity.