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Updated: Jul 3, 2026

Tandem High-pressure Freezing and Quick Freeze Substitution of Plant Tissues for Transmission Electron Microscopy
Published on: October 13, 2014
Close-to-native ultrastructural preservation by high pressure freezing
Dimitri Vanhecke1, Werner Graber, Daniel Studer
1Institute of Anatomy, University of Bern, 3000 Bern 9, Switzerland.
High pressure freezing enables vitrification of biological samples for transmission electron microscopy (TEM), preserving ultrastructure better than chemical fixation. This method is crucial for observing life science specimens closer to their living state.
Area of Science:
- Life Science
- Microscopy
- Biotechnology
Background:
- Transmission electron microscopy (TEM) requires samples to be thin and examined in a vacuum.
- Conventional sample preparation methods like chemical fixation introduce significant artifacts, hindering observation of biological structures in a near-native state.
Purpose of the Study:
- To improve the preservation of biological ultrastructure for TEM analysis.
- To overcome limitations of traditional sample preparation techniques in life sciences.
Main Methods:
- High pressure freezing (HPF) to vitrify bulk biological samples (up to 200 micrometers thick) without ice crystal formation.
- Subsequent procedures including freeze-substitution, embedding, or cryo-sectioning for cryo-TEM analysis.
Main Results:
- HPF achieves vitrification, preventing ice crystal damage and leading to improved ultrastructural preservation.
- HPF is a viable and practical method for immunocytochemistry applications.
Conclusions:
- High pressure freezing offers a superior alternative to chemical fixation for preparing biological samples for TEM.
- This technique facilitates the observation of biological structures in a state closer to their living condition, advancing life science research.
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