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Sodium ion distribution in the vitreous body

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Abstract

We have studied the nuclear magnetic resonance (NMR) relaxation behavior, and thus the dynamic properties, of the sodium ion in the vitreous body at different temperatures. The23Na NMR spectrum exhibits a resonance, the intensity of which accounts for an ion visibility of 100%. The23Na longitudinal and transverse relaxation times, at all temperatures but the highest, present two components, suggesting that the sodium ions are present in two states of different mobility, whose populations are in slow exchange on the NMR time scale. The correlation times and quadrupole coupling constants for the two sodium pools have been derived. The faster relaxation of a fraction of the vitreal sodium has tentatively been ascribed to the influence of the macromolecular framework of the vitreous body. The reported information may be of use for the understanding of the diagnostic applications of23Na magnetic resonance imaging of the ocular structures.

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Authors and Affiliations

  1. Laboratorio di Ricerca NMR, H. San Raffaele (Milano) and CNR, Centro per l'Istochimica, Pavia, Italy

    C. A. Boicelli

  2. Dipartimento di Chimica Inorganica, Università di Palermo, Palermo, Italy

    A. M. Giuliani

Authors
  1. C. A. Boicelli
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  2. A. M. Giuliani
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Boicelli, C.A., Giuliani, A.M. Sodium ion distribution in the vitreous body. MAGMA 4, 241–245 (1996). https://doi.org/10.1007/BF01772012

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  • DOI: https://doi.org/10.1007/BF01772012

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