Contributions to semithin sectioning on a conventional rotary microtome

Area of Science:

• Materials Science
• Histology
• Microscopy

Background:

• Conventional microtomy often requires expensive equipment and specialized materials for high-resolution sectioning.
• Achieving thin, precise sections (semithin sections) is crucial for detailed microscopic analysis.

Purpose of the Study:

• To describe a low-cost procedure for obtaining 1-micrometer-thick sections using a conventional rotary microtome.
• To develop a method for preparing suitable hydrophilic resin blocks for semithin sectioning.
• To create an affordable glass knife assembly for microtomy.

Main Methods:

• Hydrophilic resin blocks were prepared by incorporating divinylbenzene and methylmethacrylate into a commercial embedding kit, optimizing for hardness and elasticity.
• A simple adapter system was designed to secure the resin blocks within the microtome's specimen holder.
• A Ralph-type glass knife, 25 mm in effective blade length, was fabricated from a glass slide and mounted on a metal bar using paraffin, then fitted into the microtome's knife holder.

Main Results:

• The described method successfully produced resin blocks amenable to semithin sectioning.
• Sections as thin as 1 micrometer were consistently cut using the fabricated glass knife and optimized resin blocks.
• While staining intensity may be reduced due to section thinness, the method yields significant gains in fine resolution and minimal distortion.

Conclusions:

• A cost-effective and accessible method for producing high-resolution, low-distortion 1-micrometer tissue sections has been established.
• This technique is suitable for researchers seeking to perform detailed microscopic analysis without high-end instrumentation.
• The optimized hydrophilic resin and homemade glass knife offer a practical alternative for semithin sectioning in histology and materials science.