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The Cultivation, Growth, and Viability of Lactic Acid Bacteria: A Quality Control Perspective
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Zinc uptake by lactic Acid bacteria.

Alan Leonardi1, Simona Zanoni1, Marzia De Lucia1

  • 1Department of Life Sciences, University of Modena and Reggio Emilia, Via Campi 183, 41100 Modena, Italy.

ISRN Biotechnology
|May 5, 2015
PubMed
Summary

Certain probiotic bacteria, including Lactobacillus and Bifidobacterium, can absorb significant amounts of zinc. Lactobacillus acidophilus WC 0203 shows particular promise for use in zinc dietary supplements.

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Area of Science:

  • Microbiology
  • Nutritional Science
  • Biotechnology

Background:

  • Zinc is an essential mineral crucial for numerous physiological processes.
  • Dietary supplementation and fortification are common strategies to address zinc deficiency.
  • Probiotics offer potential as novel delivery systems for nutrients.

Purpose of the Study:

  • To evaluate the capacity of Lactobacillus and Bifidobacterium strains for zinc biosorption.
  • To identify specific strains suitable for developing organic matrices for zinc supplementation.
  • To understand the mechanism and kinetics of zinc uptake by these bacteria.

Main Methods:

  • Assaying zinc uptake in sixteen human strains of Lactobacillus and Bifidobacterium.
  • Determining minimum inhibitory concentrations of zinc salts for selected strains.
  • Culturing strains in zinc-supplemented media (MRS broth with ZnSO4).
  • Conducting pH-controlled batch cultures of the most promising strain (L. acidophilus WC 0203).

Main Results:

  • All tested strains demonstrated zinc accumulation, ranging from 11 to 135 μmol/g.
  • Lactobacillus acidophilus WC 0203 exhibited the highest zinc accumulation.
  • Zinc uptake occurred primarily during the stationary phase, suggesting a non-metabolic mechanism.
  • Pasteurized and viable cultures showed similar zinc accumulation levels.

Conclusions:

  • Lactobacillus acidophilus WC 0203 can effectively biosorb zinc, functioning as a potential organic matrix.
  • The non-metabolically mediated zinc uptake mechanism warrants further investigation.
  • Further studies on the bioavailability of Lactobacillus-bound zinc are needed for optimizing supplementation strategies.