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Biosurfactants from potato process effluents.

D N Thompson1, S L Fox, G A Bala

  • 1Biotechnologies Department, Idaho National Engineering and Environmental Laboratory, Idaho Falls 83415-2203, USA. thomdn@inel.gov

Applied Biochemistry and Biotechnology
|June 13, 2000
PubMed
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Potato processing wastewater can be used to produce surfactin, a valuable biosurfactant. Low-solids effluent yielded better results, though lower than optimized media, suggesting potential for environmental applications.

Area of Science:

  • Biotechnology
  • Environmental Microbiology
  • Industrial Microbiology

Background:

  • Surfactin is a potent biosurfactant with diverse applications.
  • Wastewater from food processing, like potato effluent, presents an underutilized resource for microbial product synthesis.

Purpose of the Study:

  • To evaluate potato processing effluents (high-solids and low-solids) as substrates for surfactin production.
  • To determine the impact of amendments and heat pretreatment on surfactin yields.

Main Methods:

  • Potato high-solids (HS) and low-solids (LS) effluents were diluted and tested with/without trace minerals or corn steep liquor.
  • Heat pretreatment was applied to address challenges posed by indigenous bacterial spores.
  • Surfactin production was compared between HS and LS effluents and a pure culture control.

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Main Results:

  • Heat pretreatment was essential for surfactin production from both HS and LS effluents.
  • Surfactin production was consistently higher in LS effluent compared to HS effluent across all tested conditions.
  • Surfactin yields from LS effluent were 66% lower than those obtained from an optimized potato starch medium.

Conclusions:

  • Low-solids potato processing effluent is a viable, albeit less efficient, substrate for surfactin production compared to optimized media.
  • The findings suggest potential for utilizing LS effluent, possibly without sterilization, for cost-effective surfactin applications in areas like environmental remediation and oil recovery.