Volume 240, Issue 1
IUPAC‐IUBMB Joint Commission on Biochemical Nomenclature (JCBN)
Free Access

Recommendations for Nomenclature and Tables in Biochemical Thermodynamics

Recommendations 1994

Robert A. Alberty

Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA

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First published: August 1996
Citations: 15

Acknowledgements: This document was first published in Pure Appl. Chem. 66, 1641–1666 (1994) (© 1994 IUPAC).

Membership of the Panel on Biochemical Thermodynamics during the preparation of this report (1991–1993) was as follows: Convener: K. A. Alberty (USA); A. Cornish‐Bowden (France); Q. H. Gibson (USA); R. N. Goldberg (USA); G. G. Hammes (USA); W. Jencks (USA); K. F. Tipton (Ireland); R. Veech (USA); H. V. Westerhoff (Netherlands); E. C. Webb (Australia).

Membership of the IUBMB‐IUPAC Joint Commission on Biochemical Nomenclature (JCBN) during the preparation of this report was as follows: Chairman: J. F. G. Vliegenthart (Netherlands); Secretary: A. J. Barrett (UK); A. Chester (Sweden); D. Coucouvanis (USA); C. Liébecq (Belgium); K. Tipton (Ireland); P. Venetianer (Hungary); Associate Members: H. B. F. Dixon (UK); J. C. Kigg (Netherlands).

Abstract

Chemical equations are written in terms of specific ionic and elemental species and balance elements and charge, whereas biochemical equations are written in terms of reactants that often consist of species in equilibrium with each other and do not balance elements that are assumed fixed, such as hydrogen at constant pH. Both kinds of reaction equations are needed in biochemistry. When the pH and the free concentrations of certain metal ions are specified, the apparent equilibrium constant K′ for a biochemical reaction is written in terms of sums of species and can be used to calculate a standard transformed Gibbs energy of reaction ΔrGo. Transformed thermodynamic properties can be calculated directly from conventional thermodynamic properties of species. Calorimetry or the dependence of K′ on temperature can be used to obtain the standard transformed enthalpy of reaction ΔrHo. Standard transformed Gibbs energies of formation ΔfG′o(i) and standard transformed enthalpies of formation ΔfHo(i) for reactants (sums of species) can be calculated at various T, pH, pMg, and ionic strength (I) if sufficient information about the chemical reactions involved is available. These quantities can also be calculated from measurement of K′ for a number of reactions under the desired conditions. Tables can be used to calculate ΔrG′o and ΔrHo for many more reactions.

Appendix

    Number of times cited according to CrossRef: 15

    • CHNOSZ: Thermodynamic Calculations and Diagrams for Geochemistry, Frontiers in Earth Science, 10.3389/feart.2019.00180, 7, (2019).
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    • The role of pH on the thermodynamics and kinetics of muscle biochemistry: An in vivo study by 31 P-MRS in patients with myo-phosphorylase deficiency, Biochimica et Biophysica Acta (BBA) - Bioenergetics, 10.1016/j.bbabio.2011.06.013, 1807, 9, (1244-1249), (2011).
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