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Related Experiment Videos

Enhanced organically bound chromium yeast production.

A Demirci1, A L Pometto III

  • 1Department of Food Science and Human Nutrition, 2312 Food Sciences Building, Iowa State University, Ames, Iowa 50011, USA.

Journal of Agricultural and Food Chemistry
|February 26, 2000
PubMed
Summary
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This study optimized chromium yeast production using continuous and fed-batch fermentation. Sodium chromate proved effective for chromium incorporation into yeast biomass.

Area of Science:

  • Biotechnology
  • Environmental Science
  • Microbiology

Background:

  • Organic chromium yeast biomass is valuable for nutritional and environmental applications.
  • Optimizing chromium uptake by yeast requires careful selection of fermentation conditions and chromium sources.

Purpose of the Study:

  • To develop and evaluate continuous and fed-batch fermentation protocols for enhanced production of organically bound chromium yeast.
  • To identify optimal inorganic chromium compounds and concentrations for yeast biomass incorporation.

Main Methods:

  • Evaluated various inorganic chromium compounds during continuous fermentation.
  • Assessed different sodium chromate concentrations and addition methods (continuous vs. single-dose) in fed-batch fermentation.
  • Compared an adapted yeast strain (C11-1) with the wild type and scaled up fermentation to pilot level.

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Main Results:

  • Sodium chromate showed the best chromium incorporation without precipitation in continuous fermentation.
  • Fed-batch fermentation with single-dose sodium chromate addition led to precipitation and reduced chromium availability.
  • The adapted strain C11-1 yielded higher biomass but lower chromium incorporation.
  • Pilot-scale fermentation achieved comparable total chromium incorporation (2966 ppm) with reduced biomass.

Conclusions:

  • Continuous fermentation with sodium chromate is effective for producing chromium-enriched yeast biomass.
  • Fed-batch strategies require optimization to prevent precipitation and maximize chromium uptake.
  • Strain adaptation can influence biomass yield and chromium incorporation efficiency.