LC-NMR Coupling via Trapping Means
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Solution Overview
Problem
Current liquid chromatography (LC) methods face challenges in directly coupling with nuclear magnetic resonance (NMR) analysis, especially in identifying isomers and complex mixtures, due to limitations in mass spectrometry and the need for offline sample collection, which affects the accuracy and efficiency of analyte identification.
Innovation Solution
A device and method that directly couple liquid chromatography with in-line NMR analysis, using a closed chromatographic assembly, conduit means, and control means to convey separated samples to an NMR assembly, enabling direct association of retention time data with NMR data, and employing trapping means and deuterated solvents to optimize NMR signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mass spectrometry is used for analyte detection in liquid chromatography, then analyte detection capability is improved, but complete identification of isomers is not achieved
Solution Approach 1:
The patent combines mass spectrometry and NMR spectroscopy into a single hybrid detector system that receives chromatographic effluent. The mass spectrometer provides molecular weight and fragmentation information, while the NMR spectrometer simultaneously provides structural information about isomer configuration. This merging allows complete identification of isomers by integrating both detection capabilities in one system.
2Loss of information
If NMR analysis is coupled with liquid chromatography, then structural information capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the NMR spectrometer and mass spectrometer into a single hybrid detector unit that shares common components such as the chromatographic interface, sample introduction system, and data processing architecture. This integration reduces the overall complexity compared to separate offline NMR and MS systems while maintaining both structural and mass spectral capabilities.
Solution Approach 2:
The hybrid detector is designed with multi-functional capabilities where a single device performs both NMR spectroscopy and mass spectrometry functions. The system can operate in different modes (NMR-only, MS-only, or combined) depending on the analytical requirements, providing universal applicability across different isomer identification scenarios.
3Ease of operation
If offline sample collection is used for NMR analysis, then sample preparation flexibility is improved, but analysis time and productivity decrease
Solution Approach 1:
The patent implements a continuous flow system where chromatographic effluent is directly introduced into the hybrid NMR-MS detector without interruption. The system maintains continuous monitoring of the eluting compounds, eliminating the discontinuities introduced by offline collection, transfer, and preparation steps. This continuous action significantly reduces analysis time while maintaining sample integrity.
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
This approach allows for the structure elucidation of small molecules by enhancing the sensitivity and accuracy of analyte identification, overcoming the limitations of offline sample collection and improving the utility of LC-NMR coupling in pharmaceutical, environmental, and forensic applications.
Implementation Method 1
liquid chromatographic separations
Implementation Method 2
nuclear magnetic resonance (NMR) analysis
Data Source
AI summary
A device for performing chromatographic separations and nuclear magnetic resonance analysis has trapping means for holding a separated sample and to form a held separated sample and placing said held separated sample in said nuclear magnetic resonance assembly. One preferred trapping means forms a held separated sample and a passed separated sample. The passed separated sample is discharged from the device. Preferred trapping means comprise a trapping column or a separated sample loop.