Applied Microbiology and Biotechnology

, Volume 30, Issue 2, pp 141–143

Citric acid production by Aspergillus niger immobilized on polyurethane foam

  • Yong Hee Lee
  • Chang Woo Lee
  • Ho Nam Chang
Biotechnology Short Contribution

Summary

Citric acid was produced using Aspergillus niger immobilized on polyurethane foam in a bubble column reactor. Most of the adsorbed cells remained on the support and, as a result, high oxygen tension was maintained during the reactor operation. However, uncontrolled growth of the pellets made continuous reactor operation difficult. The citric acid productivity obtained from 15 vol.% foam particles containing immobilized cells was 0.135 g/l per hour. This productivity of immobilized cells was almost the same as that of free cells. The oxygen level dropped to half saturation in 5 days in the immobilized cell culture in contrast to 2 days in the free cell culture.

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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • Yong Hee Lee
    • 1
  • Chang Woo Lee
    • 1
  • Ho Nam Chang
    • 1
  1. 1.Department of Chemical EngineeringKorea Advanced Institute of Science and TechnologySeoulKorea

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