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Published on: January 27, 2021
Microstructure and chemical composition of giant avian eggshells
Yannicke Dauphin1, Jean-Pierre Cuif, Murielle Salomé
1UMR IDES 8148, Bât 504, Université Paris XI-Orsay, 91405, Orsay Cedex, France. dauphin@geol.u-psud.fr
Analytical and Bioanalytical Chemistry
|October 13, 2006
Summary
Giant avian eggshells reveal sulfur
Area of Science:
- Biomineralization
- Geochemistry
- Paleontology
Background:
- Avian eggshells are complex biomineral structures.
- Understanding their composition aids in evolutionary and paleontological studies.
- Sulfur's role in eggshell formation is not fully elucidated.
Purpose of the Study:
- To investigate the microstructure and composition of two giant avian eggshells.
- To determine the distribution and form of sulfur within the eggshell layers.
- To compare findings with chicken eggshells and infer biomineralization mechanisms.
Main Methods:
- Scanning Electron Microscopy (SEM) for microstructure.
- Electron Probe Microanalyses (EPMA) for elemental composition.
- X-ray Absorption Near-Edge Structure (XANES) spectroscopy for sulfur speciation.
Main Results:
- Eggshell composition is heterogeneous across layers.
- Sulfur is linked to amino acids in organic membranes.
- Sulfur is primarily associated with sulfated polysaccharides in mineralized layers.
Conclusions:
- Sulfated acidic polysaccharides play an active role in avian biomineralization.
- Findings align with those in chicken eggshells, suggesting conserved mechanisms.
- The study provides insights into the chemical processes governing eggshell formation.
