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Overlapping ionization constants for cefotaxime.

H Fabre, N H Eddine, G Berge

    Journal of Pharmaceutical Sciences
    |January 1, 1985
    PubMed
    Summary
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    This study determined three ionization constants for cefotaxime using potentiometric titration and UV absorption. The findings attribute two overlapping constants to the carboxyl group and aminothiazole nucleus.

    Area of Science:

    • Analytical Chemistry
    • Medicinal Chemistry
    • Physical Chemistry

    Background:

    • Cefotaxime is a third-generation cephalosporin antibiotic.
    • Understanding the ionization state of cefotaxime is crucial for its pharmacokinetic and pharmacodynamic properties.
    • Accurate determination of ionization constants (pKa) aids in drug formulation and stability studies.

    Purpose of the Study:

    • To precisely determine the ionization constants for the antibiotic cefotaxime.
    • To elucidate the specific chemical moieties responsible for the observed ionization events.
    • To provide essential data for understanding cefotaxime's behavior in different physiological environments.

    Main Methods:

    • Simultaneous application of potentiometric titration and UV-Vis spectrophotometry.

    Related Experiment Videos

  • Analysis of titration data to identify distinct protonation/deprotonation steps.
  • Spectroscopic analysis to correlate spectral changes with ionization states.

    • Main Results:

    • Three distinct ionization constants for cefotaxime were successfully determined: 2.1, 3.4, and 10.9.
    • Two overlapping ionization constants (2.1 and 3.4) were identified and assigned.
    • The constant 2.1 was attributed to the carboxyl group at position 4, and 3.4 to the aminothiazole nucleus.

    Conclusions:

    • The study successfully characterized the acid-base properties of cefotaxime.
    • The specific assignments provide valuable insights into cefotaxime's chemical structure and reactivity.
    • These ionization constants are fundamental for predicting cefotaxime's solubility, absorption, and distribution.