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Related Experiment Videos

The lethal effect of tryptone-soya broth.

P M Waterworth

    Journal of Clinical Pathology
    |March 1, 1972
    PubMed
    Summary

    Tryptone-soya broth can cause bacterial death due to a significant pH drop from glucose fermentation, impacting bacterial viability in cultures. This pH change makes the medium unsuitable for certain bacterial blood cultures.

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    Area of Science:

    • Microbiology
    • Bacteriology
    • Clinical Diagnostics

    Background:

    • Bacterial culture media are essential for laboratory diagnostics.
    • Tryptone-soya broth (TSB) is a common nutrient broth used for cultivating various microorganisms.
    • Ensuring bacterial viability in culture is critical for accurate diagnostic results.

    Purpose of the Study:

    • To investigate the cause of bacterial death observed in overnight cultures of specific bacteria in tryptone-soya broth.
    • To evaluate the suitability of tryptone-soya broth and other media for bacterial blood cultures.
    • To determine the impact of pH changes on bacterial viability in different culture media.

    Main Methods:

    • Overnight cultures of Vibrio cholerae, Vibrio el tor, non-cholera vibrio, and Streptococcus pneumoniae were prepared.
    • Subcultures were attempted to assess bacterial growth.
    • Viable counts and pH determinations were performed on overnight cultures in tryptone-soya broth, brain-heart infusion broth, and Lab-Lemco peptone broth.

    Main Results:

    • Visible growth was observed in overnight cultures, but subcultures failed to grow.
    • Bacterial death in tryptone-soya broth was correlated with a significant drop in pH.
    • The pH drop in tryptone-soya broth due to glucose fermentation was greater than in brain-heart infusion broth.
    • Some pneumococcal strains did not grow in brain-heart infusion broth.

    Conclusions:

    • The significant pH decrease in tryptone-soya broth, driven by glucose fermentation, leads to bacterial death.
    • Both tryptone-soya broth and brain-heart infusion broth appear unsuitable for certain bacterial blood cultures.
    • Further research is needed to identify optimal media for reliable bacterial blood cultures.

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