Applied Microbiology and Biotechnology

, Volume 64, Issue 3, pp 403–409 | Cite as

Metabolite profiles of the biocontrol yeast Pichia anomala J121 grown under oxygen limitation

  • E. Fredlund
  • A. Broberg
  • M. E. Boysen
  • L. Kenne
  • J. Schnürer
Original Paper

Abstract

The biocontrol yeast Pichia anomala J121 prevents mould growth during the storage of moist grain under low oxygen/high carbon dioxide conditions. Growth and metabolite formation of P. anomala was analyzed under two conditions of oxygen limitation: (a) initial aerobic conditions with restricted oxygen access during the growth period and (b) initial microaerobic conditions followed by anaerobiosis. Major intra- and extracellular metabolites were analyzed by high-resolution magic-angle spinning (HR-MAS) NMR and HPLC, respectively. HR-MAS NMR allows the analysis of major soluble compounds inside intact cells, without the need for an extraction step. Biomass production was higher in treatment (a), whereas the specific ethanol production rate during growth on glucose was similar in both treatments. This implies that oxygen availability affected the respiration and not the fermentation of the yeast. Following glucose depletion, ethanol was oxidized to acetate in treatment (a), but continued to be produced in (b). Arabitol accumulated in the culture substrate of both treatments, whereas glycerol only accumulated in treatment (b). Trehalose, arabitol, and glycerol accumulated inside the cells in both treatments. The levels of these metabolites were generally significantly higher in treatment (b) than in (a), indicating their importance for P. anomala during severe oxygen limitation/anaerobic conditions.

Notes

Acknowledgements

We are grateful to Kalle Svensson for assistance with the statistical analysis of the data and to Inger Ohlsson for technical assistance. This work was financially supported by The Foundation for Strategic Environmental Research (MISTRA).

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • E. Fredlund
    • 1
  • A. Broberg
    • 2
  • M. E. Boysen
    • 1
    • 3
  • L. Kenne
    • 2
  • J. Schnürer
    • 1
  1. 1.Department of MicrobiologySwedish University of Agricultural SciencesUppsalaSweden
  2. 2.Department of ChemistrySwedish University of Agricultural SciencesUppsalaSweden
  3. 3.National Food AdministrationUppsalaSweden

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