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Optimizing Magnesium Uptake in Lacticaseibacillus Rhamnosus To Advance Nutribiotic Strategies.

Rodica-Anita Varvara1,2, Heike Budde2, Ruth Ley2

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Summary

Lacticaseibacillus rhamnosus ATCC 53,103 can absorb and store magnesium ions. This probiotic bacterium shows potential for enhancing magnesium bioavailability in the gut through microbial carrier applications.

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Area of Science:

  • Microbiology
  • Mineral Metabolism
  • Gut Microbiome Research

Background:

  • Magnesium is vital for over 300 enzymatic reactions.
  • Probiotics may enhance mineral absorption, but magnesium-probiotic interactions are unclear.

Purpose of the Study:

  • To investigate Lacticaseibacillus rhamnosus ATCC 53,103's ability to uptake magnesium ions.
  • To explore magnesium's effect on L. rhamnosus morphology and intracellular accumulation.

Main Methods:

  • Cultivating L. rhamnosus in MRS medium with varying magnesium sulfate (MgSO₄) concentrations.
  • Quantifying intracellular magnesium accumulation over seven days.
  • Analyzing morphological changes using scanning and transmission electron microscopy.

Main Results:

  • Optimal magnesium uptake occurred at 0.722 g/L MgSO₄, with a 7-fold increase in intracellular magnesium by Day 3.
  • Electron microscopy revealed cell surface ruffling and increased ribosomal visibility.
  • L. rhamnosus demonstrated significant internalization of magnesium ions.

Conclusions:

  • L. rhamnosus ATCC 53,103 can internalize magnesium ions, especially under enriched conditions.
  • This bacterium shows potential as a microbial carrier for improving magnesium bioaccessibility.
  • Findings contribute to understanding mineral-microbe interactions for nutribiotic development.