Demineralization of bone matrix: observations from electron microscope and electron-probe analysis

Area of Science:

• Materials Science
• Biomedical Engineering
• Microscopy

Background:

• Mineral displacement is a known issue in calcified tissue processing for electron microscopy.
• Accurate morphological analysis of osteogenic tissues is crucial for understanding bone development and disease.

Purpose of the Study:

• To investigate artefactual mineral loss during ultramicrotomy of osteogenic tissue.
• To assess the impact of mineral loss on the morphological interpretation of calcified tissues.
• To quantify the loss of calcium and phosphorus due to specimen preparation.

Main Methods:

• Electron microscopy (EM) for morphological investigation.
• Electron diffraction for mineral analysis.
• Electron probe X-ray microanalysis (EPXMA) for semi-quantitative elemental analysis.
• Ultramicrotomy of osteogenic tissue samples.

Main Results:

• Artefactual mineral loss was observed during ultramicrotomy of osteogenic tissue.
• Morphological changes due to mineral loss can lead to misinterpretation of cell and matrix structures.
• Electron probe X-ray microanalysis confirmed semi-quantitative loss of calcium and phosphorus.

Conclusions:

• Mineral loss during sectioning significantly alters the morphology of calcified tissues.
• Careful specimen preparation is essential to minimize artefactual mineral loss for accurate analysis.
• Findings highlight challenges in interpreting electron microscopy data from mineralized tissues.