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Related Experiment Videos

Post-pH effect in oral streptococci.

A Castillo1, S Rubiano, J Gutiérrez

  • 1Department of Microbiology, Medicine and Odontology, University of Granada, Granada, Spain. anamc@goliat.ugr.es

Clinical Microbiology and Infection : the Official Publication of the European Society of Clinical Microbiology and Infectious Diseases
|February 13, 2001
PubMed
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The post-pH effect (PpHE) in oral streptococci varies by strain and species, being minimal at alkaline pH. This finding suggests PpHE could indicate bacterial ecology or cariogenicity.

Area of Science:

  • Microbiology
  • Oral Health
  • Bacterial Physiology

Background:

  • Oral streptococci are key players in dental plaque formation and the development of caries.
  • Understanding bacterial responses to environmental pH changes is crucial for predicting their ecological role and pathogenic potential.

Purpose of the Study:

  • To investigate the post-pH effect (PpHE) in eleven strains of oral streptococci, encompassing species like Streptococcus sanguis, S. mitis, S. gordonii, S. mutans, and S. sobrinus.
  • To assess the utility of the BacT/Alert microbial detection system in quantifying PpHE.

Main Methods:

  • Oral streptococcal strains were subjected to a 1-hour exposure at various pH levels (3.6 to 8.6).
  • Following pH shock, bacteria were returned to a neutral medium, and resumed growth was monitored using the automated BacT/Alert system via CO2 detection.

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  • PpHE was calculated as the time difference between resumed growth post-pH shock and optimal growth at pH 7.0.

    • Main Results:

    • The post-pH effect (PpHE) demonstrated minimal duration at alkaline pH values.
    • Significant strain and species-specific variations in PpHE were observed among the tested oral streptococci.

    Conclusions:

    • The post-pH effect (PpHE) shows potential as an ecological determinant for oral streptococci.
    • PpHE may serve as a valuable indicator of the cariogenic potential of different oral streptococcal strains.