TY - JOUR
T1 - Simultaneous intracellular and extracellular pH measurement in the heart by 19F NMR of 6-fluoropyridoxol
AU - Hunjan, Sandeep
AU - Mason, Ralph P.
AU - Mehta, Vimal D.
AU - Kulkarni, Padmakar V.
AU - Aravind, Subramanian
AU - Arora, Veeva
AU - Antich, Peter P.
PY - 1998/4
Y1 - 1998/4
N2 - 6-Fluoropyridoxol (6-FPOL) was evaluated as a simultaneous indicator of intracellular and extracellular pH and, hence, pH gradient in perfused rat hearts. After infusion, 19F NMR spectra rapidly showed two well-resolved peaks assigned to the intracellular and extracellular compartments, and pH was calculated on the basis of chemical shift with respect to a sodium trifluoroacetate standard. To demonstrate use of this molecule, dynamic changes in myocardial pH were assessed with a time resolution of 2 min during respiratory and metabolic alkalosis or acidosis and ischemia. For a typical heart, intracellular pH (pHi) = 7.14 ± 0.01 and extracellular pH (pHe) = 7.52 ± 0.02. In response to metabolic alkalosis, pHi remained relatively constant and the pH gradient increased. In contrast, respiratory challenge caused a significant increase in pHi. Independent measurements using pH electrodes and 31p NMR confirmed validity of the 19F NMR results.
AB - 6-Fluoropyridoxol (6-FPOL) was evaluated as a simultaneous indicator of intracellular and extracellular pH and, hence, pH gradient in perfused rat hearts. After infusion, 19F NMR spectra rapidly showed two well-resolved peaks assigned to the intracellular and extracellular compartments, and pH was calculated on the basis of chemical shift with respect to a sodium trifluoroacetate standard. To demonstrate use of this molecule, dynamic changes in myocardial pH were assessed with a time resolution of 2 min during respiratory and metabolic alkalosis or acidosis and ischemia. For a typical heart, intracellular pH (pHi) = 7.14 ± 0.01 and extracellular pH (pHe) = 7.52 ± 0.02. In response to metabolic alkalosis, pHi remained relatively constant and the pH gradient increased. In contrast, respiratory challenge caused a significant increase in pHi. Independent measurements using pH electrodes and 31p NMR confirmed validity of the 19F NMR results.
KW - Fluorine
KW - Nuclear magnetic resonance spectroscopy
KW - pH gradient
KW - pH indicator
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U2 - 10.1002/mrm.1910390407
DO - 10.1002/mrm.1910390407
M3 - Article
C2 - 9543416
AN - SCOPUS:0031921940
SN - 0740-3194
VL - 39
SP - 551
EP - 556
JO - Magnetic resonance in medicine
JF - Magnetic resonance in medicine
IS - 4
ER -