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Measurement of magnesium stability constants of biologically relevant ligands by Simultaneous use of pH and ion-selective electrodes

Lookup NU author(s): Emeritus Professor Arthur Covington

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Abstract

Simultaneous measurements with magnesium ion-selective and pH glass electrodes have been used for determination of the stability constants of magnesium ions with various biologically relevant ligands by alkalimetric titration under physiological conditions (37-C, I=0.15 mol·dm-3). New systems were investigated: magnesium with pyroglutamate, pyridoxine and HEPES, along with citrate, lactate, glycinate, aspartate and glutamate. For comparison, calcium stability constants with the same ligands were determined similarly, using calcium ion-selective and pH glass electrodes. Ligand protonation constants, necessary for the calculation of the metal complex formation constants, were also determined. © 2009 Springer Science+Business Media, LLC.

Publication metadata

Author(s): Covington A, Danish E

Publication type: Article

Publication status: Published

Journal: Journal of Solution Chemistry

Year: 2009

Volume: 38

Issue: 11

Pages: 1449-1462

ISSN (print): 0095-9782

ISSN (electronic): 1572-8927

Publisher: Springer

URL: http://dx.doi.org/10.1007/s10953-009-9459-3

DOI: 10.1007/s10953-009-9459-3

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