Heat Adaptation Improved Cell Viability of Probiotic Enterococcus faecium HL7 upon Various Environmental Stresses

The production of viable functional probiotics presupposes stability of strain features in the final product

YuJin Shin

2018

Scholarcy highlights

  • The production of viable functional probiotics presupposes stability of strain features in the final product
  • E. faecium HL7 cells were exposed to 52 °C for 15 min
  • Slight decreases of unsaturated membrane fatty acid ratios were confirmed through fatty acid analysis
  • Upon subsequent exposure to various stress conditions such as H2O2, ethanol, acid, and alkali, the survival rate of heat-adapted HL7 was 103–105-fold higher than that of non-adapted one
  • These results highlight the potential of preconditioning treatments for maximizing survival of probiotic bacteria during development of probiotic functional foods
  • The cross-protection afforded by acid against thermal stress may indicate that certain common protective mechanisms are induced by both heat and acid stress. These results can be applied to enhancing the cell viability during live cell formulation of E. faecium HL7 to be used as a potential probiotics in aquaculture

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