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Design and evaluation of an automated solid-phase extraction method development system for use with biological fluids
T D Parker1, D S Wright, D T Rossi
1Department of Pharmacokinetics and Drug Metabolism, Parke-Davis Pharmaceutical Research, Division of Warner-Lambert Company, Ann Arbor, Michigan 48105, USA.
Analytical Chemistry
|July 15, 1996
Summary
An automated solid-phase extraction system using robotics offers precise and accurate drug and metabolite analysis in plasma. This validated method efficiently distinguishes optimal sorbents, matching manual extraction performance.
Area of Science:
- Analytical Chemistry
- Automation in Laboratory Science
Background:
- Solid-phase extraction (SPE) is crucial for isolating analytes from complex matrices like plasma.
- Manual SPE methods can be time-consuming and prone to variability.
- Automating SPE can enhance reproducibility and efficiency in bioanalytical workflows.
Purpose of the Study:
- To develop and validate an automated solid-phase extraction (SPE) method using robotic automation.
- To assess the system's precision and accuracy for liquid handling and analyte extraction.
- To evaluate the system's capability in differentiating solid-phase sorbent performance.
Main Methods:
- Utilized a Zymate XP robot and a custom SPE manifold for automated sample preparation.
- Spiked blank liquid matrix (plasma) with drugs, internal standards, and metabolites.
- Automated SPE cartridge conditioning, sample transfer, and analyte extraction.
- Validated liquid transfer accuracy and precision using metering pumps and syringe-based systems.
- Assessed sorbent performance and extraction efficiency from human plasma.
Main Results:
- Demonstrated acceptable precision and accuracy for various liquid transfer methods (e.g., <6% RSD for metering pump).
- The robotic system effectively distinguished between good and marginal solid-phase sorbents based on key parameters.
- Achieved high extraction efficiency (96 +/- 6%) from human plasma, comparable to manual SPE.
- Obtained precise results (2-10% RSD) for analyte extraction from plasma.
Conclusions:
- The automated SPE system provides a robust and efficient platform for bioanalytical method development.
- Robotic automation ensures high precision and accuracy in sample preparation and analyte extraction.
- This system facilitates reliable sorbent selection and achieves performance comparable to manual methods.