| Abstract: | Interaction between synthetic crystalline apatitic calcium phosphate and neutral polypeptides [poly(DL -alanine), poly(L -proline), poly(L -hydroxyproline)] was investigated by elecron-spin-resonance spectroscopy of mineral-macromolecule complexes doped with vanadyl ion (VO++) as a paramagnetic probe. Changes in magnetic parameters were interpreted in terms of polypeptide-induced axial interactions with VO++ ions that have mineral surface phosphate oxygens as their primary ligands. This implies very close proximity between mineral surface and macromolecular peptide bond dipolar substituents. |
