Parallel Liquid Chromatograph Control for Separation Consistency
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Solution Overview
Problem
Existing liquid chromatography systems face device differences leading to inconsistent separation performance due to factors like column wear and environmental changes, which current correction methods fail to adequately address, resulting in unreliable analysis results when multiple chromatographs are connected in parallel.
Innovation Solution
An analysis apparatus and method that includes a device control unit to monitor the status of multiple liquid chromatographs by using a non-retaining ingredient sample to judge separation performance, adjust sample injection timing, and execute maintenance commands based on chromatogram analysis, ensuring timely correction and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple liquid chromatographs are connected in parallel to improve throughput, then productivity increases, but device differences cause inconsistent separation performance and measurement precision deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where a standard sample is repeatedly measured across multiple chromatographs to detect and correct device differences. The system uses the measured retention times of standard samples to calculate correction values, which are then applied to adjust the operation parameters of each chromatograph, ensuring consistent separation performance while maintaining high throughput
Solution Approach 2:
The patent changes operational parameters (such as injection timing and flow rates) based on correction values derived from standard sample measurements. By adjusting these parameters dynamically for each chromatograph according to its specific characteristics, the system achieves uniform separation performance across all parallel instruments
2Measurement precision
If correction values are applied to account for device differences, then measurement precision improves, but the system becomes more complex and requires continuous monitoring and adjustment
Solution Approach 1:
The system performs self-diagnosis and self-correction by automatically measuring standard samples, calculating correction values, and adjusting its own operation parameters without requiring external intervention. This self-service capability reduces the need for manual monitoring and complex external control systems
Solution Approach 2:
The patent applies preliminary action by measuring a standard sample before actual analysis to determine correction values in advance. These pre-calculated correction values are then used to adjust the chromatographs during normal operation, avoiding the need for continuous real-time corrections and reducing system complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables early detection of separation performance deterioration and effective correction of device differences, thereby improving analysis performance and reliability across multiple chromatographs.
Implementation Method 1
a separation column separating a sample using a mobile phase, and is separated into each component included in the sample using the difference in affinity between the fixed phase filled in the separation column and the mobile phase
Data Source
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AI summary
The present invention makes it possible to realize an analysis apparatus having a plurality of liquid chromatographs capable of judging separation performance and the like at the right timing and improving analysis performance early. Analysis starts and a mixed sample is prepared by adding a non-retaining ingredient to a measurement object sample and is introduced into an analysis flow path (S401 to S404). The mixed sample is separated into components by a separation column, the components are outputted as chromatogram data by a detector, and the analysis finishes (S404 to S406). Retention time and peak information are acquired from the chromatogram outputted from the detector, whether or not a measurement result is within an allowable range is judged, and the process shifts to next analysis when the measurement result is within the allowable range (S407 to S409). An amount of transit time t0 of a non-retaining ingredient shifted from an allowable value is confirmed when separation performance is outside an allowable range at step S408 and a separation column replacement instruction is outputted to an output unit when fluctuation of the transit time t0 is within an allowable range (S410, S411). A device maintenance instruction is outputted to the output unit when the fluctuation is outside the allowable range at step S410 (S412).