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Sodium Ions in Ordered Environments in Biological Systems: Analysis of 23Na NMR Spectra

✍ Scribed by Richard Kemp-Harper; Bill Wickstead; Stephen Wimperis

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 141 KB
Volume: 140
Category: Article
ISSN: 1090-7807
DOI: 10.1006/jmre.1999.1834

No coin nor oath required. For personal study only.

✦ Synopsis

Experiments that selectively excite I ‫؍‬ 3 2 nuclei exhibiting residual quadrupolar splittings are used to acquire 23 Na NMR spectra from a range of biologically relevant samples containing sodium in ordered environments. Three complementary approaches to the analysis of such spectra are described: (i) measurement of relaxation rates, (ii) extraction of homogeneous linewidths from twodimensional Jeener-Broekaert spectra, and (iii) simultaneous fitting of detailed theoretical functions to a series of one-dimensional Jeener-Broekaert spectra. Analysis of relaxation rates provides evidence for compartmentation in bovine nasal cartilage. Each approach is used to demonstrate the presence of anisotropy in transverse relaxation in porcine tendon. For certain samples containing collagen, a good theoretical fit to the spectra was obtained using a model that allows for anisotropic relaxation by including the effects of slow lateral and radial diffusion.

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