Resolution-enhanced Fourier transform infrared spectroscopy study of the environment of phosphate ion in the early deposits of a solid phase of calcium phosphate in bone and enamel and their evolution with age: 2. Investigations in the nu3PO4 domain.

摘要: In order to investigate the possible existence in biological and poorly crystalline synthetic apatites of local atomic organizations different from that apatite, resolution-enhanced, Fourier transform infrared spectroscopy studies were carried out on chicken bone, pig enamel, containing carbonate HPO4 2− groups. The spectra obtained compared those well crystallized (stoichiometric hydroxyapatite, 2−-containing type B apatite) nonapatitic calcium phosphates which have been suggested as precursors apatitic phase [octacalcium phosphate (OCP), brushite, β tricalcium whitlockite]. bone crystalline, apatite thev 4 PO4 domain, exhibit, addition three bands, absorption bands shown be independent organic matrix. Two low-wave number at 520–530 540–550 cm−1 are assigned 2−. Reference known shows this domain also exist OCP. However, lack specific prevents a clear identification these environments. third band (610–615 cm−1) is not related or OH− ions. It appears due labile PO4 3− environment could identified with any existing our reference samples, thus seems apatites. Correlation variations intensities show 610–615 an 560 superimposed band. All environments decrease during aging Moreover, EDTA etching exhibited heterogeneous distribution insoluble precipitate.