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On-line process control of gradient elution liquid chromatography
Leif Schweitz1, Magnus Fransson, Lars Karlsson
1Analytical Development, AstraZeneca R&D Mölndal, S-431 83 Mölndal, Sweden. Leif.Schweitz@astrazeneca.com
Analytical Chemistry
|August 17, 2004
Summary
This study introduces a new continuous system suitability test for High-Performance Liquid Chromatography (HPLC) using real-time data analysis. This approach enhances analytical control and reduces the need for repeated standard injections in pharmaceutical labs.
Area of Science:
- Analytical Chemistry
- Process Analytical Technology (PAT)
Background:
- Traditional HPLC stability testing relies on frequent injections of standards, which is time-consuming and resource-intensive.
- Ensuring analytical method stability is critical in pharmaceutical quality control.
Purpose of the Study:
- To develop a novel, continuous system suitability test (SST) for HPLC methods.
- To improve analytical run control and reduce the number of standards and replicates required.
- To adapt Liquid Chromatography Process Control (LCPC) for gradient elution systems.
Main Methods:
- Continuous monitoring of chromatographic system parameters (pressure, temperature, conductivity).
- Real-time data analysis using chemometrics to generate control charts.
- Application of partial least-squares regression batch models for gradient elution LCPC.
Main Results:
- The proposed LCPC system effectively monitors chromatographic processes in real time.
- The system successfully detected induced disturbances in gradient elution LC.
- Chemometric analysis of continuous data provides easily interpretable control charts.
Conclusions:
- The developed LCPC approach offers an alternative and continuous SST for HPLC.
- This method enhances process understanding and control for both isocratic and gradient elution.
- The system demonstrates robust performance in detecting deviations, improving pharmaceutical analysis reliability.