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Related Experiment Videos

A high performance liquid chromatography method for trimethoprim utilizing solid-phase column extraction.

J E Svirbely, A J Pesce

    Therapeutic Drug Monitoring
    |June 1, 1987
    PubMed
    Summary
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    A new high-performance liquid chromatography (HPLC) assay was developed to accurately measure trimethoprim levels in patients undergoing peritoneal dialysis. This method is crucial for optimizing antibiotic treatment in renal failure patients with peritonitis.

    Area of Science:

    • Pharmacology
    • Analytical Chemistry
    • Nephrology

    Background:

    • Peritonitis is a serious complication in patients with renal failure undergoing continuous ambulatory peritoneal dialysis (CAPD).
    • Effective antibiotic therapy, including sulfamethoxazole and trimethoprim, is vital, but accurate monitoring of trimethoprim levels is challenging.
    • Existing analytical methods for trimethoprim were insufficient for pharmacokinetic studies in this patient population.

    Purpose of the Study:

    • To develop and validate a reliable analytical method for quantifying trimethoprim in serum and peritoneal dialysate.
    • To facilitate pharmacokinetic studies of trimethoprim in patients with renal failure on CAPD.
    • To support clinical applications requiring precise trimethoprim measurements, especially against resistant or opportunistic pathogens.

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    Main Methods:

    • Development of a high-performance liquid chromatography (HPLC) assay for trimethoprim analysis.
    • Solid-phase column chromatography used for efficient extraction of trimethoprim from biological matrices (serum, plasma, dialysate).
    • Reverse-phase HPLC system with specific mobile phase (0.01 M sodium acetate and acetonitrile) and UV detection at 254 nm.

    Main Results:

    • The developed HPLC assay demonstrated high efficiency (82% recovery), speed, and simplicity.
    • Excellent assay performance with high sensitivity (0.05 µg/mL), linearity (r=0.99 over 2-100 µg/mL), and between-run reproducibility (p=0.96).
    • The method showed no interference from common drugs or trimethoprim metabolites, ensuring specificity.

    Conclusions:

    • The validated HPLC assay provides a robust tool for pharmacokinetic studies of trimethoprim.
    • This method is suitable for clinical monitoring of trimethoprim, particularly in serious infections and cases involving resistant organisms.
    • Accurate trimethoprim quantification aids in optimizing treatment strategies for peritonitis in CAPD patients with renal failure.