Abstract
Summary The Haldane coefficient (the amount of the oxygen-linked hydrogen ion binding of hemoglobin) was determined in bovine erythrolysate (Hb concentration=13.5 mM) by means of the differential titration method with varying PCO2 from 0 to 74 mm Hg and pH from 6.0 to 8.5 at 37°C. The maximum value of the coefficient was found to be 0.49 mM per mM Hb at PCO2=0 and pH 7.20. With increasing of PCO2, the coefficient became smaller in all ranges of pH studied. The coefficient under the conditions of pH 7.20 and PCO2=45 mm Hg that are normally prevailing in the interior of bovine erythrocytes was 0.31.