Absolute quantification of Na+ bound fraction by double-quantum filtered 23Na NMR spectroscopy |
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Authors: | Mouaddab Mohamed Foucat Loïc Donnat Jean Pierre Renou Jean Pierre Bonny Jean Marie |
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Institution: | Structures Tissulaires et Interactions Moléculaires, UR370, INRA-Theix, 63122 Saint-Genes-Champanelle, France. |
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Abstract: | A method is described for the absolute quantification of double-quantum filtered spectra of spin-3/2 nuclei ((23)Na). The method was tested on a model system, a cationic exchange resin for which the number of Na(+) binding sites was quantitatively controlled. The theoretical and experimental approaches were validated on samples with different Na(+) concentrations. An excellent agreement between the results obtained by double-quantum and single-quantum acquisitions was found. This method paves the way for absolute quantification of both bound and free fractions of Na(+), which are determining factors in the characterization of salted/brined/dried food products. |
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