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Applied Biochemistry and Biotechnology

, Volume 187, Issue 2, pp 449–460 | Cite as

Factors Affecting Production of Itaconic Acid from Mixed Sugars by Aspergillus terreus

  • Badal C. SahaEmail author
  • Gregory J. Kennedy
  • Michael J. Bowman
  • Nasib Qureshi
  • Robert O. Dunn
Article
  • 161 Downloads

Abstract

Itaconic acid (IA; a building block platform chemical) is currently produced industrially from glucose by fermentation with Aspergillus terreus. In order to expand the use of IA, its production cost must be lowered. Lignocellulosic biomass has the potential to serve as low-cost source of sugars for IA production. It was found that the fungus cannot produce IA from dilute acid pretreated and enzymatically saccharified wheat straw hydrolysate even at 100-fold dilution. The effects of typical compounds (acetic acid, furfural, HMF and Mn2+, enzymes, CaSO4), culture conditions (initial pH, temperature, aeration), and medium components (KH2PO4, NH4NO3, CaCl2·2H2O, FeCl3·6H2O) on growth and IA production by A. terreus NRRL 1972 using mixed sugar substrate containing glucose, xylose, and arabinose (4:3:1, 80 g L−1) mimicking the wheat straw hydrolysate were investigated. Acetic acid, furfural, Mn2+, and enzymes were strong inhibitors to both growth and IA production from mixed sugars. Optimum culture conditions (pH 3.1, 33 °C, 200 rpm) and medium components (0.8 g KH2PO4, 3 g NH4NO3, 2.0 g CaCl2·2H2O, 0.83–3.33 mg FeCl3·6H2O per L) as well as tolerable levels of inhibitors (0.4 g acetic acid, < 0.1 g furfural, 100 mg HMF, < 5.0 ppb Mn2+, 24 mg CaSO4 per L) for mixed sugar utilization were established. The results will be highly useful for developing a bioprocess technology for IA production from lignocellulosic feedstocks.

Keywords

Itaconic acid Aspergillus terreus Submerged fermentation Mixed sugars Inhibitory compounds Mn2+ 

Notes

Acknowledgements

The authors thank James Swezey, microbiologist (retired), for supplying Aspergillus terreus NRRL 1972 from ARS Culture Collection, Peoria, IL, and Kim Ascherl for the metal analysis by ICP-OES.

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

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Copyright information

© This is a U.S. government work and its text is not subject to copyright protection in the United States; however, its text may be subject to foreign copyright protection 2018

Authors and Affiliations

  1. 1.Bioenergy Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, US Department of AgriculturePeoriaUSA
  2. 2.Bio-Oils Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, US Department of AgriculturePeoriaUSA

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