Applied Microbiology and Biotechnology

, Volume 101, Issue 10, pp 4033–4040 | Cite as

Enhancing fungal production of galactaric acid

Biotechnological products and process engineering

Abstract

Galactaric (mucic) acid is a symmetrical six carbon diacid which can be produced by oxidation of galactose with nitric acid, electrolytic oxidation of d-galacturonate or microbial conversion of d-galacturonate. Both salts and the free acid of galactarate have relatively low solubility, which may create challenges for a microbial host. Galactaric acid was most soluble at pH values around 4.7 in the presence of ammonium or sodium ions and less soluble in the presence of potassium ions. Solubility increased with increasing temperature. Production of galactaric acid by Trichoderma reesei D-161646 was dependent on temperature, pH and medium composition, being best at pH 4 and 35 °C. Up to 20 g L−1 galactaric acid were produced from d-galacturonate using a fed-batch strategy with lactose as co-substrate and both ammonium and yeast extract as nitrogen sources. Crystals of galactaric acid were observed to form in the broth of some fermentations.

Keywords

Trichoderma reesei Galactaric acid Mucic acid Solubility d-galacturonate 

Notes

Acknowledgements

This research was supported by the VTT BioEconomy Programme. We thank Merja Aarnio for technical assistance.

Compliance with ethical standards

Funding

This study was funded through the VTT BioEconomy Programme.

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.VTT Technical Research Centre of Finland Ltd.EspooFinland

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