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Calorimetric determination of the standard transformed enthalpy of a biochemical reaction at specified pH and pMg.

Publication ,  Journal Article
Alberty, RA; Goldberg, RN
Published in: Biophys Chem
October 1993

In a biochemical reaction there is generally a change in the binding of hydrogen ions and metal ions. Therefore, calorimetric measurements of enthalpies of reaction have to be adjusted for the enthalpies of reaction of the hydrogen ions and metal ions produced or consumed with the buffer. It can be shown that this yields the standard transformed enthalpy of reaction that determines the change in the apparent equilibrium constant K' (written in terms of sums of concentrations of species of a reactant) with temperature at the chosen pH and concentration of free metal ion. The derivations are based on the assumption that the changes in pH and free metal ion concentrations in the calorimetric experiment are small. This assumption is experimentally realized if a solution is well buffered for hydrogen and metal ions. The derived equations are discussed in terms of the implications they have for the performance and interpretation of calorimetric measurements.

Duke Scholars

Published In

Biophys Chem

DOI

ISSN

0301-4622

Publication Date

October 1993

Volume

47

Issue

3

Start / End Page

213 / 223

Location

Netherlands

Related Subject Headings

  • Thermodynamics
  • Models, Chemical
  • Magnesium
  • Hydrogen-Ion Concentration
  • Calorimetry
  • Biophysics
  • 06 Biological Sciences
  • 03 Chemical Sciences
  • 02 Physical Sciences
 

Citation

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MLA
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Alberty, R. A., & Goldberg, R. N. (1993). Calorimetric determination of the standard transformed enthalpy of a biochemical reaction at specified pH and pMg. Biophys Chem, 47(3), 213–223. https://doi.org/10.1016/0301-4622(93)80046-l
Alberty, R. A., and R. N. Goldberg. “Calorimetric determination of the standard transformed enthalpy of a biochemical reaction at specified pH and pMg.Biophys Chem 47, no. 3 (October 1993): 213–23. https://doi.org/10.1016/0301-4622(93)80046-l.
Alberty, R. A., and R. N. Goldberg. “Calorimetric determination of the standard transformed enthalpy of a biochemical reaction at specified pH and pMg.Biophys Chem, vol. 47, no. 3, Oct. 1993, pp. 213–23. Pubmed, doi:10.1016/0301-4622(93)80046-l.
Journal cover image

Published In

Biophys Chem

DOI

ISSN

0301-4622

Publication Date

October 1993

Volume

47

Issue

3

Start / End Page

213 / 223

Location

Netherlands

Related Subject Headings

  • Thermodynamics
  • Models, Chemical
  • Magnesium
  • Hydrogen-Ion Concentration
  • Calorimetry
  • Biophysics
  • 06 Biological Sciences
  • 03 Chemical Sciences
  • 02 Physical Sciences