Metabolic flux analysis of hydrogen production network by Clostridium butyricum W5: Effect of pH and glucose concentrations

Guiqin Cai, Bo Jin, Chris Saint, Paul Monis

    Research output: Contribution to journalArticle

    56 Citations (Scopus)

    Abstract

    Fermentative hydrogen production by strict anaerobes has been widely reported. There is a lack of information related to metabolic flux distribution and its variation with respect to fermentation conditions in the metabolic production system. This study aimed to get a better understanding of the metabolic network and to conduct metabolic flux analysis (MFA) of fermentative hydrogen production by a recently isolated Clostridium butyricum strain W5. We chose the specific growth rate as the objective function and used specific H2 production rate as the criterion to evaluate the experimental results with the in silico MFA. For the first time, we constructed an in silico metabolic flux model for the anaerobic glucose metabolism of C. butyricum W5 with assistance of a modeling program MetaFluxNet. The model was used to evaluate metabolic flux distribution in the fermentative hydrogen production network, and to study the fractional flux response to variations in initial glucose concentration and operational pH. The MFA results suggested that pH has a more significant effect on hydrogen production yield compared to the glucose concentration. The MFA is a useful tool to provide valuable information for optimization and design of the fermentative hydrogen production process.

    Original languageEnglish
    Pages (from-to)6681-6690
    Number of pages10
    JournalInternational Journal of Hydrogen Energy
    Volume35
    Issue number13
    DOIs
    Publication statusPublished - Jul 2010

    Keywords

    • Clostridium butyricum
    • Fermentative hydrogen production
    • Initial glucose concentrations
    • Metabolic flux analysis
    • Operational pH

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