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Applied Biochemistry and Biotechnology

, Volume 168, Issue 5, pp 1311–1318 | Cite as

Animal Bone Char Solubilization with Itaconic Acid Produced by Free and Immobilized Aspergillus terreus Grown on Glycerol-Based Medium

  • Nikolay Vassilev
  • Almudena Medina
  • Bettina Eichler-Löbermann
  • Elena Flor-Peregrín
  • Maria Vassileva
Article

Abstract

Cells of Aspergillus terreus, free and immobilized in polyurethane foam, were employed in itaconic acid fermentation processes on glycerol-based media. The purpose was to assess their suitability for animal bone char solubilization and the development of a biotechnological alternative to P fertilizers chemically produced from rock phosphate. Animal bones constitute a renewable source of P that can replace the traditionally used finite, nonrenewable rock phosphate as a P source. Glycerol was an excellent substrate for growth (10.2 g biomass L−1) and itaconic acid production (26.9 g L−1) by free fungal cells after 120-h fermentation. Simultaneously, A. terreus solubilized the insoluble phosphate to a yield of 23 to 50 %, depending on the particle size and concentration. Polyurethane foam cut into cubes of 0.5–0.6 cm per side, with 0.3 mm pore size and applied at 2.0 g L−1 proved to be an excellent cell carrier. In repeated batch fermentation, the immobilized mycelium showed a high capacity to solubilize animal bone char, which resulted on average in 168.8 mg L–1 soluble phosphate per 48-h cycle and 59.4 % yield (percent of total phosphate) registered in the fourth batch.

Keywords

Immobilized cells Aspergillus terreus Glycerol Animal bone char Solubilization 

Notes

Acknowledgments

This work was supported by Projects CTM2008-03524, CTM2011-027797 (Ministerio de Ciencia e Innovación, España), P09-RNM-5196 (Project from the Junta de Andalucía, Proyecto de Excelencia), and EU COST FA0905 and FA1103. NV is grateful for the SABF PR2010-0422—Ministerio de Educacion, España.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Nikolay Vassilev
    • 1
    • 4
  • Almudena Medina
    • 2
  • Bettina Eichler-Löbermann
    • 3
  • Elena Flor-Peregrín
    • 4
  • Maria Vassileva
    • 1
  1. 1.Department of Chemical Engineering, Faculty of SciencesUniversity of GranadaGranadaSpain
  2. 2.Netherlands Institute of Ecology (NIOO-KNAW)WageningenThe Netherlands
  3. 3.Department of Crop Science, Faculty of Agricultural and Environmental SciencesUniversity of RostockRostockGermany
  4. 4.Institute of BiotechnologyUniversity of GranadaGranadaSpain

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