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Fixation and Sectioning01:03

Fixation and Sectioning

Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens.
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...

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Replacing xylene with n-heptane for paraffin embedding.

J C Stockert1, B López-Arias, P Del Castillo

  • 1Department of Biology, Faculty of Sciences, Autonomous University of Madrid, Cantoblanco, Madrid 28049, Spain.

Biotechnic & Histochemistry : Official Publication of the Biological Stain Commission
|August 3, 2012
PubMed
Summary

N-heptane offers a safer alternative to harmful aromatic solvents like xylene in histology. This study demonstrates n-heptane effectively replaces xylene for tissue processing, ensuring excellent morphology and staining results.

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Area of Science:

  • Histology and Histopathology
  • Chemical Safety in Laboratories

Background:

  • Standard histological protocols utilize aromatic solvents (xylene, toluene) for tissue clearing and de-waxing.
  • These solvents pose health risks, necessitating safer alternatives in histological techniques.

Purpose of the Study:

  • To evaluate n-heptane as a safer substitute for xylene in histological tissue processing.
  • To assess the efficacy of n-heptane in paraffin embedding and de-waxing procedures.

Main Methods:

  • Rat tissues were processed using n-heptane as a clearing agent.
  • Paraffin sections were stained using hematoxylin-eosin and Masson's trichrome stains.

Main Results:

  • Tissue sections processed with n-heptane exhibited proper embedment.
  • Morphology of the rat tissues was well preserved.
  • Staining quality with hematoxylin-eosin and Masson's trichrome was excellent.

Conclusions:

  • N-heptane serves as a suitable and convenient substitute for xylene in standard histological techniques.
  • The use of n-heptane maintains tissue integrity and staining quality, offering a safer alternative for histology labs.