Significance of bed porosity, bran and specific surface area in solid-state cultivation of Aspergillus oryzae

Y.S.P. Rahardjo, F. Jolink, S. Haemers, J. Tramper, A. Rinzema

Research output: Contribution to journalArticleAcademicpeer-review

20 Citations (Scopus)

Abstract

In this paper, the effects of bed porosity, bran and specific surface area on the oxygen uptake rate and ¿-amylase production during growth of Aspergillus oryzae on wheat grain and wheat¿flour substrate are reported. The high oxygen uptake rate found during cultivation of A. oryzae on wheat¿flour substrate was not reached on wheat grain. This is mainly due to the bran of the wheat grain. Using wheat¿flour substrates, it was shown that extra bed porosity increased the ¿-amylase production and oxygen uptake rates. Furthermore, the peak oxygen uptake rate decreased with increasing surface area¿volume ratio of the substrate particles, while the ¿-amylase production and the cumulative oxygen uptake per gram of initial substrate dry matter increased. The present work does not support a direct correlation between aerial mycelia and enzyme production. There is, however, a correlation between the ¿-amylase yield and the cumulative oxygen uptake (not the uptake rate). This implies that aerial mycelia could accelerate ¿-amylase production even if they do not increase the yield
Original languageEnglish
Pages (from-to)133-139
JournalBiomolecular Engineering
Volume22
Issue number4
DOIs
Publication statusPublished - 2005

Keywords

  • fermentation system
  • aerial hyphae
  • model

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