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Related Experiment Videos

Ultrafiltration using the Amicon MPS-1 for assessing methadone plasma protein binding

J N Wilkins1, A Ashofteh, D Setoda

  • 1Mental Health Division, West Los Angeles VA Medical Center, California 90073, USA.

Therapeutic Drug Monitoring
|February 1, 1997
PubMed
Summary

This study shows the Amicon MPS-1 device reliably separates protein-free and protein-bound methadone in plasma. Free methadone levels vary significantly among patients and correlate with total methadone levels and dosage.

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Area of Science:

  • Pharmacology
  • Analytical Chemistry
  • Clinical Chemistry

Background:

  • Methadone is a widely used opioid agonist therapy for opioid use disorder.
  • Understanding the unbound fraction of methadone is crucial for optimizing therapeutic efficacy and minimizing adverse effects.
  • Existing methods for separating protein-bound and protein-free methadone can be complex and time-consuming.

Purpose of the Study:

  • To evaluate the efficacy of the Amicon MPS-1 ultrafiltration device for separating protein-free and protein-bound methadone.
  • To determine the concentration of free and bound methadone in plasma samples from patients undergoing methadone maintenance therapy.
  • To investigate the relationship between free methadone levels, total methadone levels, patient demographics, and methadone dosage.

Main Methods:

Related Experiment Videos

  • Ultrafiltration using the Amicon MPS-1 device to separate protein-free and protein-bound methadone fractions.
  • Extraction of methadone from separated fractions.
  • Quantification of methadone concentrations using gas chromatography with nitrogen-phosphorus detection.
  • Analysis of 85 patient plasma samples from a methadone maintenance program.

Main Results:

  • The Amicon MPS-1 device effectively separated protein-free and protein-bound methadone, with no measurable proteins in the filtrate.
  • The ultrafiltration process was independent of methadone concentration and sample volume (up to 40% filtration).
  • Patient samples exhibited a sixfold variation in %-free methadone, with slightly higher levels in females (11.9% +/- 3.8%) compared to males (10.1% +/- 3.4%).
  • Steady-state free and total methadone levels positively correlated with increasing methadone dose (r=0.521 and r=0.491, respectively).
  • Free methadone levels showed a strong correlation with total methadone levels (Pearson r=0.85).

Conclusions:

  • The Amicon MPS-1 ultrafiltration system is a reliable and user-friendly method for separating protein-free from protein-bound methadone.
  • Significant variability in free methadone levels exists among patients, suggesting potential clinical relevance.
  • Further research is warranted to elucidate the clinical applications and implications of monitoring free methadone levels in patients on maintenance therapy.