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American Journal of Science, Vol. 305, June/September/October 2005, P.673-686

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Spectromicroscopy at the organic-inorganic interface in biominerals

Gelsomina De Stasio*, Margaret A. Schmitt** and Samuel H. Gellman**

* University of Wisconsin-Madison, Department of Physics, and Synchrotron Radiation Center, 3731 Schneider Drive, Stoughton, Wisconsin 53589; pupa{at}src.wisc.edu
** University of Wisconsin-Madison, Department of Chemistry, 1101 University Avenue, Madison, Wisconsin 53706

After a brief introduction to biomineralization, we describe x-ray absorption near-edge structure (XANES) spectromicroscopy, and how this approach explores the poorly understood mechanisms of biomineral formation. In particular, XANES identifies the molecular groups forming chemical bonds at the organic-inorganic interface. The first two experiments, on microbial polysaccharide-FeOOH mineralized filaments and on a synthetic peptide, are discussed.






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