World Journal of Microbiology and Biotechnology

, Volume 27, Issue 8, pp 1933–1939 | Cite as

Butanol production by Clostridium beijerinckii BA101 using cassava flour as fermentation substrate: enzymatic versus chemical pretreatments

  • Leonardo Lépiz-Aguilar
  • Carlos E. Rodríguez-Rodríguez
  • María Laura Arias
  • Giselle Lutz
  • William Ulate
Short Communication

Abstract

Cassava flour (CF), a cost-effective source of starch, was employed as a substrate for successful acetone-butanol-ethanol (ABE) production by batch-fermentation with Clostridium beijerinckii. The effect of temperature, initial concentration of CF and chemical/enzymatic hydrolysis were studied in a 23 factorial design. Results revealed that temperature and initial concentration of substrate exert a significant effect on ABE production, as well as interactions of temperature with the other variables. Solvent production was maximized when working at 40°C, 60 g l−1 CF and enzymatic pretreatment. An average of 31.38 g l−1 ABE was produced after 96 h, with a productivity of 0.33 g l−1 h−1. A posterior randomized block design (3 × 2) showed that enzymatic hydrolysis (with saccharification periods of 6 h at 60°C) enhances both reducing sugar and solvent production if compared to chemical pretreatments. Average ABE production in this case was 27.28 g l−1, with a productivity of 0.28 g l−1 h−1. Results suggest that CF may be a suitable substrate for industrial ABE production.

Keywords

Cassava Butanol ABE fermentation Hydrolysis Clostridium beijerinckii 

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Leonardo Lépiz-Aguilar
    • 1
  • Carlos E. Rodríguez-Rodríguez
    • 2
    • 5
  • María Laura Arias
    • 2
  • Giselle Lutz
    • 3
  • William Ulate
    • 1
    • 4
  1. 1.School of Chemical EngineeringUniversidad de Costa Rica (UCR)San JoséCosta Rica
  2. 2.Food and Water Microbiology Laboratory, Faculty of MicrobiologyUCRSan JoséCosta Rica
  3. 3.School of ChemistryUCRSan JoséCosta Rica
  4. 4.Costa Rican Petroleum Refinery (RECOPE)San JoséCosta Rica
  5. 5.Unitat de Biocatàlisi Aplicada associada al IQAC (CSIC-UAB) and Departament d’Enginyeria Química, Escola d’EnginyeriaUniversitat Autònoma de BarcelonaBellaterraSpain

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