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  • Title: Error in the calibration of the MgATP chemical-shift limit: effects on the determination of free magnesium by 31P NMR spectroscopy.
    Author: Mosher TJ, Williams GD, Doumen C, LaNoue KF, Smith MB.
    Journal: Magn Reson Med; 1992 Mar; 24(1):163-9. PubMed ID: 1556922.
    Abstract:
    The measurement of free intracellular magnesium (Mg2+) using the 31P chemical shifts of ATP requires the use of appropriate calibration solutions to determine the chemical-shift limits delta ATP alpha beta and delta MgATP alpha beta. Solutions containing excess Mg2+ contain significant amounts of Mg2ATP and yield positive errors in the value of delta MgATP alpha beta. For physiological applications this may overestimate free intracellular Mg2+ by as much as 300%. This error may be minimized if appropriate mole ratios of Mg2+/ATP are used to calibrate delta MgATP alpha beta.
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