Journal of Industrial Microbiology

, Volume 16, Issue 4, pp 224–229 | Cite as

Optimization of some parameters influencingThermoascus aurantiacus growth: Effects of lignin-related compounds

  • A Machuca
  • N Durán


Statistical designs were used to optimize some parameters affecting the growth rate of a Brazilian strain ofThermoascus aurantiacus. The mycelial growth rate was measured using the horizontal tube method. Temperature of incubation and initial pH were the major factors affecting the growth rate. They were optimal at 6.0 and 48°C, respectively. The maximum growth rate was obtained in solid Czapek modified medium containing 1.5% glucose and 38.4 mEq L−1NaNO3. Under these conditions, the growth rate ofT. aurantiacus was 5.16±0.10 mm h−1. Lignin-related compounds such as tannins and extractive substances added at 0.1% (w/v) to the minimal Czapek medium increased growth rate 14% and 29%, respectively.


Thermoascus aurantiacus thermophilic fungus growth rate optimization statistical-design optimization ligninrelated compounds 


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Copyright information

© Society for Industrial Microbiology 1996

Authors and Affiliations

  • A Machuca
    • 1
  • N Durán
    • 2
  1. 1.Instituto de Biologia, Department of BiochemistryUniversidade Estadual de CampinasCampinasBrazil
  2. 2.Instituto de Quimica, Biological Chemistry LaboratoryUniversidade Estadual de CampinasCampinasBrazil

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