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Cefotaxime stability during in vitro microbiological testing.

C R Marchbanks1, R L Yost, R L White

  • 1College of Pharmacy, Medical University of South Carolina, Charleston 29425.

Antimicrobial Agents and Chemotherapy
|September 1, 1987
PubMed
Summary
This summary is machine-generated.

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Cefotaxime, a broad-spectrum cephalosporin, degrades in lab tests, potentially underestimating its antibacterial power. This instability was confirmed through high-performance liquid chromatography analysis.

Area of Science:

  • Microbiology
  • Pharmacology
  • Analytical Chemistry

Background:

  • Cefotaxime is a broad-spectrum cephalosporin antibiotic.
  • Its stability is affected by serum esterases, temperature, and pH.
  • Instability during testing can lead to inaccurate assessments of antibacterial activity.

Purpose of the Study:

  • To investigate the instability of cefotaxime and its metabolite, desacetylcefotaxime, under in vitro microbiological testing conditions.
  • To quantify cefotaxime degradation during susceptibility testing.
  • To correlate degradation with changes in microbiological assay results.

Main Methods:

  • Cefotaxime and desacetylcefotaxime solutions were prepared.
  • Solutions were tested under conditions simulating Minimum Inhibitory Concentration (MIC) and serum inhibitory titer assays.

Related Experiment Videos

  • Cefotaxime concentrations were measured using high-performance liquid chromatography (HPLC).

    • Main Results:

    • Cefotaxime concentrations decreased by 20-30% during incubation across various tested systems.
    • The most significant decline in cefotaxime concentration was observed in media containing serum.
    • Observed changes in microbiological susceptibility test results after 6 and 18 hours of incubation correlated with HPLC findings.

    Conclusions:

    • Cefotaxime exhibits significant instability under standard in vitro microbiological testing conditions.
    • This instability, particularly in the presence of serum, can lead to underestimation of cefotaxime's antibacterial efficacy.
    • Accurate assessment of cefotaxime activity requires consideration of its degradation during in vitro assays.