Intracellular pH determination for the study of acid tolerance of lactic acid bacteria

Hiromu Kudo, Yasuko Sasaki

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

4 Citations (Scopus)


It is important to assess acid tolerance in lactic acid bacteria, particularly for probiotics, although it involves multiple mechanisms. Measuring the difference between intracellular and extracellular pH (ΔpH) using the fluorescent probe CFDA-SE is particularly effective for such assessments because it gives direct information on the level of tolerance in the extracellular acidic pH range from 7 to 2.5. It also enables acid adaptation to be induced and observed by slowly introducing HCl into the medium and decreasing the extracellular pH. The difference of acid tolerance between anaerobic and aerobic conditions in lactic acid bacteria can also be evaluated by measuring ΔpH.

Original languageEnglish
Title of host publicationMethods in Molecular Biology
PublisherHumana Press Inc.
Number of pages9
Publication statusPublished - 2019

Publication series

NameMethods in Molecular Biology
ISSN (Print)1064-3745


  • Acid adaptation
  • Acid tolerance
  • Anaerobic condition
  • Fluorescent probe
  • Intracellular pH
  • ΔpH


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