Clinical Chemistry
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Clinical Chemistry 37: 1350-1355, 1991;
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Clinical Chemistry, Vol 37, 1350-1355, Copyright © 1991 by American Association for Clinical Chemistry

Characterization of sodium-selective optode membranes based on neutral ionophores and assay of sodium in plasma

K Seiler, K Wang, E Bakker, WE Morf, B Rusterholz, UE Spichiger and W Simon
Swiss Federal Institute of Technology (ETH), Department of Organic Chemistry, Zurich, Switzerland.

Plasticized poly(vinyl chloride) membranes that incorporate a highly lipophilic sodium-selective neutral ionophore (ETH 4120) and novel H(+)- selective chromo-ionophores, lipophilic isologs of Nile Blue, are used in the competitive binding of Na+ and H+ for a reversible, optical determination of sodium activities in buffered solutions at different selected pH values. These optode membranes are used to assay total sodium concentrations in pH-buffered human blood plasma.




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Copyright © 1991 by the American Association for Clinical Chemistry.