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. 2022 Apr 25;14(9):1792. doi: 10.3390/nu14091792

Figure 1.

Figure 1

1D 1H NMR spectrum for EDTA-anticoagulated plasma collected on a 400 MHz spectrometer (see text) showing the peak corresponding to ethylene protons (i.e., -N-CH2-CH2-N-) from EDTA-complexed magnesium. This peak (labeled as MgEDTA) was used to quantify ionized magnesium in the sample.