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Related Experiment Videos

Sirolimus quantification by high-performance liquid chromatography with ultraviolet detection.

Maria Claudina Camargo de Andrade1, Giovana Seno Di Marco, Claudia Rosso Felipe

  • 1Department of Medicine-Nephrology Division, Federal University of São Paulo, Escola Paulista de Medecina, Rua Botucatu 740, 5574-6300 São Paulo, Brazil.

Transplant International : Official Journal of the European Society for Organ Transplantation
|February 26, 2005
PubMed
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Optimizing sirolimus blood monitoring requires specific laboratory conditions. A high-performance liquid chromatography-ultraviolet method was refined, demonstrating that mobile phase B is crucial for accurate sirolimus and internal standard elution.

Area of Science:

  • Analytical Chemistry
  • Clinical Chemistry

Background:

  • Sirolimus blood level monitoring is essential for therapeutic drug management.
  • Existing high-performance liquid chromatography-ultraviolet (HPLC-UV) methods require optimization for specific laboratory conditions.

Purpose of the Study:

  • To optimize an HPLC-UV method for sirolimus blood level monitoring.
  • To compare the elution performance of two distinct mobile phases (A and B).

Main Methods:

  • An HPLC-UV method was optimized using C-18 column chromatography at 50°C.
  • Two mobile phases were tested: Mobile phase A (68% MeOH/2% ACN/30% H2O) and Mobile phase B (30% MeOH/42% ACN/28% H2O).
  • Assay sensitivity, recovery, and precision (intra- and interassay) were evaluated.

Main Results:

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  • Mobile phase A failed to elute and recover sirolimus and the internal standard within the expected parameters.
  • Mobile phase B demonstrated effective elution and recovery, with an assay sensitivity of 2.5-150 ng/ml.
  • The optimized assay showed high precision (intra-assay 3.3–13%, interassay 5.9–15%) and accuracy (recovery 92–103.6%).

Conclusions:

  • Mobile phase B is critical for the successful and accurate quantification of sirolimus using this HPLC-UV method.
  • Laboratory-specific conditions, including mobile phase selection, are vital for precise and sensitive sirolimus monitoring.
  • Method optimization ensures reliable therapeutic drug monitoring, adapting to laboratory demands and staff capabilities.