ACS Omega· 2026Q1
Structure Determination of a Single Bioapatite Crystal from an Archeological Metastatic Cancer Bone – a TEM Case Study
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- 2026year
Short summary
Researchers determined the crystal structure of a single bioapatite nanocrystal from archeological bone cancer using 3D Electron Diffraction, revealing it crystallizes in space groups P63 and P63/m with no carbonate substitution and a Ca/P ratio of 1.65.
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Key points
- 3D Electron Diffraction (3D ED) was used to analyze a single bioapatite nanocrystal from archeological bone.
- The crystal structure was determined to be in space groups P63 and P63/m.
- No carbonate substitution was detected in the single bioapatite crystal.
- The average Ca/P ratio measured on the single crystal was 1.65.
AI-generated from the title and abstract; the full text is not read.
Abstract
Abstract The inorganic component of bone, bioapatite, is generally regarded as a poorly crystalline, carbonate-substituted hydroxyapatite. However, a direct structural and chemical characterization of bioapatite has not yet been achieved due to the extremely small size of its crystals ─ typically only a few tens of nanometers ─ and their intimate association with the organic matrix of bone. In this study, we examined a single crystal of bioapatite extracted from an archeological, metastatic bone cancer sample using 3D ED (3-Dimensional Electron Diffraction), which enabled structural analysis of the three-dimensional reciprocal space despite the nanometric crystal dimensions. Conventional structural techniques, such as single-crystal X-ray diffraction, require crystals several orders of magnitude larger than those found in bone, rendering them inapplicable to individual bioapatite crystallites. Powder-based methods, on the other hand, can only provide averaged structural information across billions of crystals, obscuring the intrinsic structural features of individual nanocrystals. The bioapatite single crystal was found to crystallize in space groups P63 and P63/m, with lattice parameters a = 9.414 Å; c = 6.881 Å, and showed no evidence of carbonate substitution. The measured Ca/P ratio on single crystals was 1.65 on average.
The authors' abstract, as published at the source. ACS Omega, 2026 · DOI ↗
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Structural BiologyBiochemistry, Genetics and Molecular Biology