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<p>Probiotic microorganisms offer health benefits but do not colonize the human gut permanently and are eventually excreted. Notably, many microbial species possess the inherent ability to bind metal ions, suggesting potential for detoxification applications. This study evaluates the uptake of barium (Ba), cobalt (Co), and cesium (Cs) by freeze-dried cells of three probiotic microorganisms, specifically, <i>Streptococcus thermophilus</i> (<i>S. thermophilus</i>), <i>Lactobacillus casei</i>, and <i>Saccharomyces boulardii</i>, (<i>S. boulardii</i>) compared to activated charcoal (Merck) and a pharmaceutical-grade adsorbent (Carbosylane). Metal uptake was quantified using radioatracers: <sup>133</sup>Ba, <sup>60</sup>Co, and <sup>137</sup>Cs. All microorganisms exhibited greater Ba and Co binding than reference sorbents, whereas Cs uptake by <i>S. boulardii</i> was minimal. Ba adsorption on <i>S. thermophilus</i> fitted both the Freundlich and Dubinin–Radushkevich models, the latter indicating a maximum capacity of 110&#xa0;mg&#xa0;g⁻<sup>1</sup>. These results demonstrate the potential of probiotic biomass as an efficient natural sorbent for metal ion detoxification, with direct relevance to water safety and public health applications.</p>

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Uptake of Ba, Co and Cs in aqueous media by food microorganisms

  • 期刊论文

  • 发表日期：

    2025年12月22日

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  • Dimitrios Athanasopoulos,
  • Kyriakos Bourikas,
  • Petros Koutsoukos,
  • Argyro Bekatorou,
  • Eleana Kordouli,
  • Athanasia Koliadima,
  • Sarantos Marinakis,
  • Basil Symeopoulos

摘要

Probiotic microorganisms offer health benefits but do not colonize the human gut permanently and are eventually excreted. Notably, many microbial species possess the inherent ability to bind metal ions, suggesting potential for detoxification applications. This study evaluates the uptake of barium (Ba), cobalt (Co), and cesium (Cs) by freeze-dried cells of three probiotic microorganisms, specifically, Streptococcus thermophilus (S. thermophilus), Lactobacillus casei, and Saccharomyces boulardii, (S. boulardii) compared to activated charcoal (Merck) and a pharmaceutical-grade adsorbent (Carbosylane). Metal uptake was quantified using radioatracers: 133Ba, 60Co, and 137Cs. All microorganisms exhibited greater Ba and Co binding than reference sorbents, whereas Cs uptake by S. boulardii was minimal. Ba adsorption on S. thermophilus fitted both the Freundlich and Dubinin–Radushkevich models, the latter indicating a maximum capacity of 110 mg g⁻1. These results demonstrate the potential of probiotic biomass as an efficient natural sorbent for metal ion detoxification, with direct relevance to water safety and public health applications.