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Seleno-lactobacillus. An organic selenium source

M Calomme1, J Hu, K Van den Branden

  • 1Laboratory of Microbiology, Faculty of Medicine, University of Antwerp, Belgium.

Biological Trace Element Research
|January 1, 1995
PubMed
Summary
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Lactic acid bacteria can concentrate selenium within their cells, forming seleno-cysteine. This finding has potential applications for selenium supplementation strategies.

Area of Science:

  • Microbiology
  • Biochemistry
  • Nutritional Science

Background:

  • Lactic acid bacteria (LAB) are widely utilized in food production.
  • Understanding their metabolic capabilities is crucial for food and nutritional applications.

Purpose of the Study:

  • To investigate the ability of Lactobacillus species to accumulate selenium.
  • To identify the form in which selenium is stored intracellularly.

Main Methods:

  • Culturing Lactobacillus species in a selenium-enriched medium.
  • Analyzing bacterial biomass for selenium content.
  • Using dialysis and TCA precipitation to characterize intracellular selenium compounds.
  • Identifying seleno-amino acids via biochemical analysis.

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Main Results:

  • Lactobacillus species demonstrated significant selenium concentration, reaching 400 micrograms/g dry biomass from a 1 microgram/mL medium concentration.
  • Over 80% of the concentrated selenium was found to be organically bound within the cells.
  • Seleno-cysteine was identified as the sole seleno-amino acid present in intracellular selenoproteins.

Conclusions:

  • Lactic acid bacteria possess a notable capacity for intracellular selenium accumulation.
  • Selenium is primarily stored as seleno-cysteine in Lactobacillus species.
  • This bioaccumulation capability suggests potential for using LAB in selenium-fortification strategies and supplementation studies.