Journal
JOURNAL OF STRUCTURAL BIOLOGY
Volume 186, Issue 1, Pages 38-48Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jsb.2014.02.006
Keywords
Pigmentation; Tooth; Shrew; Enamel; Amorphous magnetite; Nanoindentation; Microstructure; X-ray diffraction; Transmission electron microscopy
Funding
- DFG Emmy Noether Program for the Bone geochemistry group [TU 148/2-1]
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Pigmented tooth enamel occurs in several vertebrate clades, ranging from mammals to fish. Although an iron compound is associated with this orange to red colored pigmentation, its chemical and structural organization within the enamel is unknown. To determine the nature of the iron compound, we investigated heavily pigmented teeth of the northern short-tailed shrew Blarina brevicauda using combined characterization techniques such as scanning and transmission electron microscopy and synchrotron X-ray diffraction. We found that the pigmentation of the enamel with an iron content of around 8 wt% results from a close to amorphous magnetite phase deposited around the nm-sized enamel crystals. Furthermore, the influence of the pigmentation on the enamel hardness was determined by nanoindentation measurements. Finally, the biomechanical function and biological context are discussed in light of the obtained results. (C) 2014 Elsevier Inc. All rights reserved.
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