Reactivity differences between haemoglobins. Part IX. Thermodynamics of the reaction of azide ion with some animal methaemoglobins
- 1 January 1968
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 1337-1340
- https://doi.org/10.1039/j19680001337
Abstract
The free energies and enthalpies of formation of the azide complexes of pigeon, dog, and guinea pig methaemoglobins have been determined as a function of pH. A characteristic feature of these reactions is the almost exact compensation between large enthalpy and entropy changes over a wide pH range, and the bell-shaped curve describing the variation of ΔH with pH. A correlation is shown to exist between the pH of maximum ΔH and the isoelectric point of any methaemoglobin.Keywords
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