Chromatogram Data Processing for Impurity Detection
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Solution Overview
Problem
Existing chromatograph systems face challenges in accurately determining the presence of impurities within target peaks and performing high-accuracy quantitative analysis of overlapping component peaks, especially when peaks are close or entirely superposed, requiring complex calculations and noise vector settings.
Innovation Solution
A system and method that process three-dimensional chromatogram data by creating differential chromatograms based on wavelength differential coefficients at maximum or minimum absorption wavelengths, allowing for impurity detection and quantitative analysis without complex calculations, by differentiating absorbance spectra and analyzing temporal changes in chromatogram waveforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional peak purity determination methods are used, then impurity detection is performed, but complex calculations and noise vector settings are required
Solution Approach 1:
The patent transforms the peak purity determination problem by changing the parameter being analyzed from absorbance values to wavelength differential coefficients. By calculating the differential coefficient with respect to wavelength at each time point and plotting these against time, the method simplifies the detection process while maintaining high accuracy in impurity detection, eliminating the need for complex noise vector settings.
2Measurement precision
If conventional methods are used for overlapping peaks, then quantitative analysis is attempted, but high accuracy cannot be achieved when peaks are entirely superposed
Solution Approach 1:
The patent introduces a new dimensional approach by plotting wavelength differential coefficients against time to create differential chromatograms. This transformation from traditional absorbance-time plots to differential coefficient-time plots provides enhanced resolution for overlapping peaks, enabling accurate quantitative analysis even when peaks are entirely superposed by exploiting the differential characteristics at maximum absorption wavelengths.
3Measurement precision
If traditional peak purity determination is performed, then impurity detection is conducted, but determination time is extended
Solution Approach 1:
The patent extracts only the critical information needed for peak purity determination by calculating wavelength differential coefficients specifically at maximum absorption wavelengths and plotting them against time. This selective extraction of differential characteristics at key wavelengths streamlines the determination process, achieving high accuracy impurity detection while significantly reducing the time required compared to conventional methods that analyze all wavelengths.
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 accurate impurity detection and high-accuracy quantitative analysis of overlapping peaks with simplified calculations, improving efficiency and reducing determination time, even when peaks are closely located or entirely superposed.
Implementation Method 1
three-dimensional chromatogram data obtained by using a chromatograph, and more specifically, for processing data collected by a spectrometric analysis of a sample containing components separated by a column of a liquid chromatograph
Data Source
AI summary
A data processing system for a chromatograph has an impurity detector including a differential chromatogram creator and a determining section. The differential chromatogram creator calculates a wavelength differential coefficient by differentiating an absorbance spectrum with respect to the wavelength at each point in time of the measurement and creates a differential chromatogram which shows a temporal change in the wavelength differential coefficient. Based on a shape of the thus created differential chromatogram, the determining section determines whether or not a peak of a target component contains an impurity. By this method, whether or not the peak of the target component contains an impurity can be determined with high accuracy, without requiring complex calculations.