Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Improving the Viability of Freeze-dried Probiotics Using a Lysine-based Rehydration Mixture

  • Arellano, Karina (Department of Advanced Convergence, Handong Global University) ;
  • Park, Haryung (HEM Inc., Handong Global University) ;
  • Kim, Bobae (HEM Inc., Handong Global University) ;
  • Yeo, Subin (HEM Inc., Handong Global University) ;
  • Jo, Hyunjoo (HEM Inc.) ;
  • Kim, Jin-Hak (COSMAX NS Inc.) ;
  • Ji, Yosep (HEM Inc.) ;
  • Holzapfel, Wilhelm H. (Department of Advanced Convergence, Handong Global University)
  • Received : 2020.12.27
  • Accepted : 2021.02.27
  • Published : 2021.06.28
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Abstract

The probiotic market is constantly continuing to grow, concomitantly with a widening in the range and diversity of probiotic products. Probiotics are defined as live microorganisms that provide a benefit to the host when consumed at a proper dose; the viability of a probiotic is therefore of crucial importance for its efficacy. Many products undergo lyophilization for maintaining their shelf-life. Unfortunately, this procedure may damage the integrity of the cells due to stress conditions during both the freezing and (vacuum-) drying process, thereby impacting their functionality. We propose a lysine-based mixture for rehydration of freeze-dried probiotics for improving their viability during in vitro simulated gastric and duodenum stress conditions. Measurement of the zeta potential served as an indicator of cell integrity and efficacy of this mixture, while functionality was estimated by adhesion to a human enterocyte-like Caco-2 cell-line. The freeze-dried bacteria exhibited a significantly different zeta potential compared to fresh cultures; however, this condition could be restored by rehydration with the lysine mixture. Recovery of the surface charge was found to influence adhesion ability to the Caco-2 cell-line. The optimum lysine concentration of the formulation, designated "Zeta-bio", was found to be 0.03 M for improving the viability of Lactiplantibacillus plantarum Lp-115 by up to 13.86% and a 7-strain mixture (400B) to 41.99% compared to the control rehydrated with distilled water. In addition, the lysine Zeta-bio formulation notably increased the adherence ability of lyophilized Lp-115 to the Caco-2 cell-line after subjected to the in vitro stress conditions of the simulated gastrointestinal tract passage.

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References

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