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Automated analytical systems for drug development studies. II--A system for dissolution testing
1Department of Pharmaceutical Chemistry, University of Kansas, Lawrence 66045, USA.
Journal of Pharmaceutical and Biomedical Analysis
|December 1, 1994
Summary
Automated microdialysis sampling reproducibly measures tablet dissolution. This method, validated for acetaminophen and Sulfatrim, offers an efficient alternative to manual sampling in pharmaceutical analysis.
Area of Science:
- Pharmaceutical Sciences
- Analytical Chemistry
- Drug Delivery
Background:
- Traditional tablet dissolution testing often involves manual sampling, which can be labor-intensive and prone to variability.
- Microdialysis offers a dynamic sampling technique for in-situ analysis of analytes in complex matrices.
- Automating dissolution testing can improve efficiency, reproducibility, and data quality in pharmaceutical quality control.
Purpose of the Study:
- To develop and validate an automated system for tablet dissolution testing using microdialysis sampling.
- To compare the dissolution profiles obtained by automated microdialysis with those from manual sampling.
- To assess the reproducibility and drug recovery characteristics of the microdialysis probe in dissolution media.
Main Methods:
- An automated system was created by interfacing a microinfusion pump and an on-line liquid chromatography (LC) system with a dissolution apparatus.
- A microdialysis loop probe was immersed in the dissolution medium for continuous sampling.
- The system was used to measure the dissolution of acetaminophen and Sulfatrim tablets, with drug recovery and reproducibility assessed.
Main Results:
- The automated microdialysis system demonstrated high reproducibility (RSD < 2%) for measuring tablet dissolution.
- Drug recovery from the microdialysis probe was dependent on the perfusion rate but independent of drug concentration within the linear assay range.
- Dissolution profiles generated by microdialysis sampling were comparable to those obtained by manual sampling for both acetaminophen and Sulfatrim tablets.
Conclusions:
- Automated microdialysis provides a reproducible and reliable method for characterizing drug release from tablets.
- The technique allows for in-line sample conditioning, such as buffering, prior to LC analysis.
- Microdialysis sampling is a viable alternative to manual methods for dissolution testing, offering potential advantages in automation and sample handling.