Influences of phenolic compounds on citric acid productivity by Aspergillus niger in stirred fermentor

• Bekir Stk Çevrml ^[1] ; Ergin Karipta ^[2] ; Ahmet Yaar ^[1] ; Mustafa Ytolu ^[3]
  1. [1] Gazi University

     Gazi University

     Turquía

     
  2. [2] Ahi Evran University

     Ahi Evran University

     Turquía

     
  3. [3] Kırıkkale University

     Kırıkkale University

     Turquía

     

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• Localización: Electronic Journal of Biotechnology, ISSN-e 0717-3458, Vol. 13, Nº. 6, 2010, págs. 8-9
• Idioma: inglés
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• Resumen

  • Influences of phenol, ?-naphtol and ?-naphtol, which are toxic chemicals, on citric acid biosynthesis and biomass in the artificial culture setting of Aspergillus niger using batch fermenter are examined in the most favorable fermentation conditions, and a model is proposed. Addition of certain concentrations of phenol, ?-naphtol and ?-naphtol to the culture increases the citric acid production. According to this model, maximum citric acid concentration is 48.3 g L-1 in a culture that does not contain any toxic chemicals, whereas the maximum concentrations obtained in cultures containing 25 mg L-1 phenol, 25 mg L-1 alpha-naphtol and 15 mg L-1 beta-naphtol are 62.5 g L-1, 78.1 g L-1 and 86.0 g L-1, respectively. Moreover, addition of toxic chemicals to the culture reduces fermentation time by 24 hrs.