Blatter L A, McGuigan J A
Q J Exp Physiol. 1986 Jul;71(3):467-73. doi: 10.1113/expphysiol.1986.sp003005.
The free Mg concentration ([Mg]i) was measured in ferret ventricular muscle using single-barrelled Mg-sensitive micro-electrodes. The electrodes were calibrated in solutions containing the [K]i and [Na]i measured in this tissue. In thirteen measurements from seven experiments conforming to strict criteria for calibration and penetration the estimated mean [Mg]i was 0.4 mmol/l. This is to be regarded as an upper limit since it was estimated by linear extrapolation of the calibration curve.
