Development of linear irreversible thermodynamic model for oxidation reduction potential in environmental microbial system

Hong Bang Cheng, Mathava Kumar, Jih-Gaw Lin*

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Nernst equation has been directly used to formulate the oxidation reduction potential (ORP) of reversible thermodynamic conditions but applied to irreversible conditions after several assumptions and/or modifications. However, the assumptions are sometimes inappropriate in the quantification of ORP in nonequilibrium system. We propose a linear nonequilibrium thermodynamic model, called microbial related reduction and oxidation reaction (MIRROR Model No. 1) for the interpretation of ORP in biological process. The ORP was related to the affinities of catabolism and anabolism. The energy expenditure of catabolism and anabolism was directly proportional to overpotential (h), straight coefficient of electrode (LEE), and degree of coupling between catabolism and ORP electrode, respectively. Finally, the limitations of MIRROR Model No. 1 were discussed for expanding the applicability of the model.

Original languageEnglish
Pages (from-to)787-794
Number of pages8
JournalBiophysical Journal
Volume93
Issue number3
DOIs
StatePublished - 1 Jan 2007

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