Liquid Chromatograph Method Transfer Using Dwell Volume Correction
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Solution Overview
Problem
Conventional liquid chromatography method transfer techniques fail to maintain high accuracy when linear velocity is increased, particularly when transitioning from a conventional to a faster linear velocity condition, without adequate consideration for improving accuracy.
Innovation Solution
The method transfer process incorporates data from the column, such as inner diameter, length, and particle diameter, and uses dwell volume and correction values to adjust flow rate, pressure, and time programs, ensuring accurate transfer by setting the linear velocity and pressure limits, and accounting for dwell volume delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If linear velocity is increased to achieve faster analysis, then productivity is improved, but measurement precision deteriorates
Solution Approach 1:
The patent applies parameter changes by systematically adjusting multiple chromatographic parameters (flow rate, gradient time, injection volume, column dimensions) when transferring methods between different linear velocity conditions. The system calculates new parameter values based on the ratio of linear velocities and applies correction factors to maintain retention time accuracy while operating at different speeds.
2Device complexity
If conventional method transfer techniques are used without dwell volume correction, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent introduces dwell volume as an intermediary parameter that mediates the transfer process between different chromatographic systems. By measuring and correcting for dwell volume differences, the system accurately transfers retention time data between instruments with different dead volumes, improving measurement precision without significantly increasing operational complexity.
3Measurement precision
If column data and correction values are incorporated into method transfer, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent implements feedback by measuring actual retention times after method transfer and comparing them with calculated values. Correction factors are calculated based on the differences between expected and actual results, and these corrections are applied to refine the transfer process. This iterative feedback mechanism improves measurement precision while managing complexity through automated calculations.
Data Source
AI summary
Provided is a liquid chromatograph system and method configured to accurately obtain measurements by minimizing deviations in measurements due to a transfer from one measurement method to another measurement method. An aspect of the system and method includes minimizing deviations in measurements when a measurement method from a measurement system of a liquid chromatograph is transferred to measurement system under high pressure and high velocity. Such a transfer includes deviations due to differences in analysis conditions. The present subject matter uses a dwell volume value so as to minimize a deviation of measurement result due to methods before and after transfer. Another aspect includes calculating a correction value when there is a deviation in the measurement result, and automatically reflecting the correction value for the method transfer.