Absolute quantification of Na+ bound fraction by double-quantum filtered 23Na NMR spectroscopy.
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.
Mouaddab
Mohamed
M
Structures Tissulaires et Interactions Moléculaires, UR370, INRA-Theix, 63122 Saint-Genes-Champanelle, France.
Foucat
Loïc
L
Donnat
Jean Pierre
JP
Renou
Jean Pierre
JP
Bonny
Jean Marie
JM
D000465:Algorithms; D002411:Cation Exchange Resins / Q000032:analysis*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008962:Models, Theoretical; D012964:Sodium / Q000032:analysis / Q000378:metabolism*; D012975:Sodium Isotopes
D002411:Cation Exchange Resins; D012975:Sodium Isotopes; D012964:Sodium