Stoichiometry and kinetics of single and mixed substrate uptake in Aspergillus niger

F. Da Fonte Lameiras, Cor Ras, Angela Ten Pierick, Joseph J. Heijnen, Walter M. van Gulik*

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    3 Citations (Scopus)
    50 Downloads (Pure)

    Abstract

    In its natural environment, the filamentous fungus Aspergillus niger grows on decaying fruits and plant material, thereby enzymatically degrading the lignocellulosic constituents (lignin, cellulose, hemicellulose, and pectin) into a mixture of mono- and oligosaccharides. To investigate the kinetics and stoichiometry of growth of this fungus on lignocellulosic sugars, we carried out batch cultivations on six representative monosaccharides (glucose, xylose, mannose, rhamnose, arabinose, and galacturonic acid) and a mixture of these. Growth on these substrates was characterized in terms of biomass yields, oxygen/biomass ratios, and specific conversion rates. Interestingly, in combination, some of the carbon sources were consumed simultaneously and some sequentially. With a previously developed protocol, a sequential chemostat cultivation experiment was performed on a feed mixture of the six substrates. We found that the uptake of glucose, xylose, and mannose could be described with a Michaelis–Menten-type kinetics; however, these carbon sources seem to be competing for the same transport systems, while the uptake of arabinose, galacturonic acid, and rhamnose appeared to be repressed by the presence of other substrates.

    Original languageEnglish
    Pages (from-to)1-14
    Number of pages14
    JournalBioprocess and Biosystems Engineering: bioreactors, upstream and downstream processes, measurement and control
    DOIs
    Publication statusPublished - 19 Oct 2017

    Keywords

    • Aspergillus niger
    • Kinetics
    • Plant waste streams
    • Stoichiometry
    • Substrate uptake

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