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Digitale Medien

31P NMR as a spectroscopic monitor of the spontaneous precipitation of calcium phosphates (1983)

Yesinowski, James P. ; Benedict, James J.

Springer

Calcified tissue international 35 (1983), S. 284-286

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Details

ISSN: 1432-0827

Schlagwort(e): Phosphorus ; NMR ; Precipitation ; Nucleation ; Phosphate

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Medizin , Physik

Notizen: Summary High-resolution31P NMR spectroscopy is shown to be a potentially valuable new method for monitoring the spontaneous precipitation of calcium phosphates from metastable supersaturated solutions. An apparatus capable of pH-statting the sample in a spinning 20 mm NMR sample tube is briefly described. The spontaneous precipitation of dicalcium phosphate dihydrate, CaHPO4· 2H2O, pH-statted at pH 5, is characterized by a base-uptake curve which follows the decrease in the intensity of the solution31P resonance. The precipitation of amorphous calcium phosphate at neutral pH, which exhibited an induction period of ∼ 10 min, was also studied. No evidence of NMR peaks from transient clusters or the initial colloidal solid phase has been seen.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02405047

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