Concentration dependence of 19F nuclear magnetic resonance decay shapes and second moments in bone mineral
✍ Scribed by Neil Gelman; R.Fraser Code
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 179 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0926-2040
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✦ Synopsis
19
Ž
. Ž . F nuclear magnetic resonance NMR spin-echoes and free induction decays FIDs have been observed from samples Žw x. of fluoridated trabecular canine bone powder, with fluoride concentrations F ranging from approximately 10 to 33 mg Frg Ca. Curve fitting of echo envelopes and FIDs was performed using a two-component model function, where one of the components incorporates the effects of one-dimensional dipolar coupling. This function provides a good match for both echo Ž . envelopes and FIDs. Estimates of the total second moment and its homonuclear F-F coupling component were obtained from the fitting procedure. Based on the second moment measurements, it is argued that 19 F spins in bone mineral typically Ž . experience weaker heteronuclear dipolar coupling than those in the mineral hydroxyapatite HAP , which is often considered to be a prototype for bone mineral.