Better epoxy resin embedding for electron microscopy at low relative humidity

Area of Science:

• Materials Science
• Microscopy Techniques
• Histology

Background:

• Environmental relative humidity can significantly affect the quality of tissue embedding for microscopy.
• Poor embedding leads to difficulties in sectioning and compromises downstream analysis.

Purpose of the Study:

• To identify and mitigate the negative effects of high humidity on tissue embedding.
• To establish a reliable embedding protocol that ensures optimal sectioning properties.

Main Methods:

• A detailed step-by-step protocol for tissue dehydration using graded alcohols and acetone.
• Infiltration with a specific acetone-epoxy resin mixture, followed by pure epoxy resin.
• Post-infiltration processing involving vacuum desiccation over Drierite and thermal curing at 60°C.

Main Results:

• The proposed embedding procedure successfully avoids humidity-related artifacts.
• Tissues embedded using this method exhibit improved sectioning properties compared to those embedded under high humidity conditions.

Conclusions:

• This protocol provides a robust solution for consistent and high-quality tissue embedding, irrespective of ambient humidity.
• The method is crucial for reproducible histological analysis in electron microscopy and other sectioning-dependent techniques.