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Methods for pH determination in human erythrocytes.

D Büttner1, J Büttner

  • 1Institut für Klinische Chemie I, Medizinische Hochschule Hannover.

Journal of Clinical Chemistry and Clinical Biochemistry. Zeitschrift Fur Klinische Chemie Und Klinische Biochemie
|February 1, 1989
PubMed
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Direct pH measurement of red blood cells is recommended over the DMO method. Differences in cellular water space calculations may explain discrepancies in intracellular pH determination.

Area of Science:

  • Biochemistry
  • Physiology
  • Analytical Chemistry

Background:

  • Accurate intracellular pH measurement in human erythrocytes is crucial for understanding various physiological processes.
  • Existing methods, including direct potentiometric measurement and the 5,5-dimethyl-2,4-oxazolidinedione (DMO) method, have limitations.

Purpose of the Study:

  • To compare the accuracy and reliability of direct potentiometric measurement versus the DMO method for determining pH in human erythrocytes.
  • To identify potential sources of discrepancy between the two methods.

Main Methods:

  • Direct potentiometric measurement of pH in haemolysed human erythrocytes.
  • Determination of intracellular pH using the 5,5-dimethyl-2,4-oxazolidinedione (DMO) distribution method.
  • Careful optimization of experimental techniques for both methods.

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Main Results:

  • A statistically significant difference of a few hundredths of a pH unit was observed between the two methods, even after optimization.
  • Uncertainty in calculating erythrocyte cellular water space was identified as a potential cause for differences in DMO method results.
  • This uncertainty impacts the determination of DMO concentration and derived intracellular pH values.

Conclusions:

  • Direct pH measurement of haemolysed erythrocytes is recommended for clinical applications due to its greater reliability.
  • The DMO method's reliance on cellular water space calculations introduces variability in intracellular pH determination.
  • Further investigation into erythrocyte water space determination may refine the DMO method.