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Biosurfactant production by Bacillus subtilis using cassava-processing effluent.

Marcia Nitschke1, Glaucia Maria Pastore

  • 1Laboratório de Bioquímica, DCA, FEA, UNICAMP, Rua Monteiro Lobato, 80 Cx. Postal 6121, CEP 13083-970, Campinas, SP, Brazil. nitschke@bol.com.br

Applied Biochemistry and Biotechnology
|March 10, 2004
PubMed
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Cassava processing waste effectively supports biosurfactant production by Bacillus subtilis. One strain yielded higher yields of a surfactin-like biosurfactant, indicating potential for sustainable bioprocessing.

Area of Science:

  • Biotechnology and Industrial Microbiology
  • Environmental Biotechnology
  • Biochemistry

Background:

  • Cassava flour processing generates significant effluent (manipueira), posing disposal challenges.
  • Biosurfactants are surface-active compounds with diverse industrial applications, often produced by bacteria.
  • Bacillus subtilis is a known producer of valuable biosurfactants like surfactin.

Purpose of the Study:

  • To evaluate cassava effluent (manipueira) as a cost-effective substrate for biosurfactant production.
  • To compare the biosurfactant yield and characteristics from two Bacillus subtilis strains using this effluent.

Main Methods:

  • Cultivation of Bacillus subtilis ATCC 21332 and B. subtilis LB5a in cassava effluent medium.
  • Measurement of surface tension reduction and crude biosurfactant concentration.

Related Experiment Videos

  • Analysis of protease activity and characterization of the produced biosurfactant.

    • Main Results:

    • Both B. subtilis strains successfully reduced surface tension and produced biosurfactants.
    • B. subtilis LB5a achieved a higher crude biosurfactant concentration (3.0 g/L) and reduced surface tension to 26.6 mN/m.
    • The biosurfactant from B. subtilis LB5a showed similarity to surfactin; increased protease activity in ATCC 21332 correlated with lower surfactant yield.

    Conclusions:

    • Cassava effluent is a viable and sustainable substrate for Bacillus subtilis-mediated biosurfactant production.
    • B. subtilis LB5a demonstrates superior performance for producing surfactin-like biosurfactants from this agro-industrial waste.
    • This finding supports the development of eco-friendly bioprocesses for biosurfactant manufacturing.