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Related Experiment Videos

Gentamicin binding to serum and plasma proteins.

D R Myers, J DeFehr, W M Bennet

    Clinical Pharmacology and Therapeutics
    |March 1, 1978
    PubMed
    Summary

    Gentamicin protein binding decreases with higher calcium and magnesium levels but increases with heparin. These factors may influence gentamicin

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    Area of Science:

    • Pharmacology
    • Biochemistry

    Background:

    • Gentamicin is an antibiotic with potential toxicity.
    • Understanding gentamicin binding to serum proteins is crucial for optimizing its pharmacokinetics.

    Purpose of the Study:

    • To investigate the influence of divalent cations (calcium, magnesium) and heparin on gentamicin binding to serum proteins.

    Main Methods:

    • Equilibrium dialysis at 37°C and pH 7.4.
    • Varied concentrations of ionized calcium, magnesium, and heparin in serum and buffered solutions.

    Main Results:

    • Gentamicin binding decreased as calcium and magnesium concentrations increased (27% to 17%).
    • No significant difference in binding was observed between healthy and uremic sera.
    • Heparin increased apparent gentamicin-protein binding, reaching 34% in serum and up to 65% in buffered solutions without proteins.

    Conclusions:

    • Divalent cations and heparin significantly affect gentamicin-protein binding.
    • These binding interactions may have implications for gentamicin's pharmacokinetic behavior and renal uptake.

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