A simplified method of preparation of mammalian intestine samples for scanning electron microscopy

Area of Science:

• Biological Sciences
• Microscopy Techniques
• Anatomical Pathology

Background:

• Gastrointestinal tissue preparation for scanning electron microscopy (SEM) is complex due to high hydration and intricate mucosal architecture.
• Existing methods often struggle with inhomogeneous tissues like the small intestine, leading to artifacts and unreliable analyses.

Purpose of the Study:

• To present a simplified, cost-effective method for preparing small intestinal mucosa for SEM.
• To highlight critical steps in tissue preparation to prevent artifacts and ensure reliable SEM observations.

Main Methods:

• A simplified protocol for preparing small intestinal mucosa for SEM was developed.
• Buffered formalin was used as the primary fixative to ensure proper tissue stiffening and preservation of intestinal villi.
• The technique was validated across diverse species including mammals, reptiles, and birds.

Main Results:

• The developed method successfully preserves the structure of highly hydrated intestinal villi without shrinkage artifacts.
• It facilitates reliable SEM analysis by minimizing common preparation-induced artifacts.
• The technique is suitable for field conditions, reducing tissue collection and preparation time and costs.

Conclusions:

• This simplified SEM preparation technique enhances the quality of small intestinal tissue analysis.
• It offers a practical and efficient solution for researchers studying gastrointestinal morphology across various species.