Automated solid-phase extraction of opiates from urine (I)

Area of Science:

• Analytical Chemistry
• Forensic Toxicology

Background:

• Accurate quantification of opiates like morphine and codeine in biological samples is crucial for clinical and forensic applications.
• Traditional extraction methods can be time-consuming and labor-intensive, necessitating more efficient techniques.

Purpose of the Study:

• To develop and optimize a fully automated solid-phase extraction (SPE) method for morphine and codeine in urine.
• To evaluate the performance of C18 bonded-phase columns for opiate extraction.
• To establish a reliable and efficient analytical method for opiate detection.

Main Methods:

• Utilized a fully automated solid-phase extraction system with C18 bonded-phase columns.
• Employed high-performance liquid chromatography (HPLC) for the analysis of extracted urine samples.
• Investigated the impact of urine pH, washing solvents, and eluent composition on opiate recovery.
• Optimized eluent volume by establishing a recovery-time profile.

Main Results:

• Achieved absolute recoveries exceeding 80% for morphine and codeine.
• Demonstrated that opiate recovery is dependent on urine pH, washing solvents, and eluent choice.
• Showcased the reusability of C18 columns with negligible carry-over and minimal recovery loss.
• Established an optimized automated extraction procedure.

Conclusions:

• A fully automated SPE method using C18 columns provides efficient and reliable extraction of morphine and codeine from urine.
• The optimized method offers high recovery rates and column reusability, suitable for routine analysis.
• This technique enhances the accuracy and efficiency of opiate analysis in toxicological settings.