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Development of an enzymatic method for the assay of serum magnesium using phosphoglucomutase and glucose-6-phosphate dehydrogenase

✍ Scribed by Kenji Suzuki; Yuzo Kayamori; Yoshiaki Katayama

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
353 KB
Volume
24
Category
Article
ISSN
0009-9120

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✦ Synopsis

We developed an assay for serum magnesium (Mg) by coupling phosphoglucomutase (EC 2.7.5.1) with glucose-6-phosphate dehydrogenase (EC 1.1.1.49). The kinetic generation of NADPH by the action of the above two enzymes upon glucose-l-phosphate (Gl-P) and glucoso-l,6-diphosphate (G-1,6-P) was proportional to the concentration of Mg in serum, and was monitored at 340 nm. The average within-run and day-to-day imprecision (% CVs), as determined from 10 replicate analyses for three sera with different Mg concentrations, were 0.8 to 2.1% and 1.9 to 2.7%, respectively. For 60 clinical samples, including several with lipemia and hemolysis, our method showed good agreement with atomic absorption spectrophotometry and the Xylidyl Blue method. We also present data showing that the method is highly sensitive, rapid, relatively free of interference, and amenable to automation.

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