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Related Experiment Video

Updated: Jul 11, 2026

A Method to Quantify Visual Information Processing in Children Using Eye Tracking
09:47

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Published on: July 9, 2016

A focus on fixation.

C M van der Loos1

  • 1Department of Pathology, Academic Medical Center M2-230, Meibergdreef 9, NL-1105 AZ Amsterdam, The Netherlands. c.m.vanderloos@amc.uva.nl

Biotechnic & Histochemistry : Official Publication of the Biological Stain Commission
|September 14, 2007
PubMed
Summary

Fixation methods significantly impact immunostaining results. Pre-fixation choice affects epitope retrieval, while long fixation times and post-fixation can compromise antigen integrity, challenging the "gold standard" cryostat method.

Area of Science:

  • Histopathology
  • Immunohistochemistry
  • Molecular Biology

Background:

  • Fixation is a critical step in tissue processing for immunostaining.
  • Different fixation methods (pre-fixation vs. post-fixation) have distinct effects on antigen preservation and detection.
  • The traditional
  • gold standard
  • of acetone post-fixed cryostat sections is re-evaluated due to potential peptide loss.

Purpose of the Study:

  • To discuss critical fixation issues impacting immunostaining quality.
  • To highlight the influence of fixative type and fixation duration on antigen retrieval and antibody performance.
  • To propose a revised understanding of fixation techniques and suggest controls for antibody validation.

Main Methods:

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  • Analysis of pre-fixation techniques (crosslinking vs. coagulating) and their relation to epitope retrieval.
  • Evaluation of the impact of prolonged fixation times and potential mitigation strategies like tyramide signal amplification.
  • Comparison of pre-fixation and post-fixation (acetone) methods, focusing on peptide preservation in different cellular states.

Main Results:

  • Fixative type dictates appropriate epitope retrieval methods for specific antigens.
  • Extended fixation, particularly with crosslinking agents, can reduce immunostaining sensitivity, though tyramide amplification may partially restore it.
  • Acetone post-fixation can lead to the loss of small peptides from disrupted cells, undermining its status as a universal
  • gold standard
  • .

Conclusions:

  • The choice of fixation method is paramount and antigen-dependent, influencing epitope accessibility and antibody staining.
  • Long fixation times and acetone post-fixation present challenges for optimal immunostaining, necessitating careful consideration and validation.
  • A positive control cell block strategy is recommended for validating antibody suitability with formalin-fixed, paraffin-embedded tissues.