Two-Dimensional Liquid Chromatography Lipid Separation
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Solution Overview
Problem
Current lipid separation methods, such as reverse-phase chromatography, fail to distinguish between lipid classes, while normal-phase and HILIC chromatography provide limited separation within classes, leading to co-elution issues and reduced peak capacity and dynamic range in lipid analysis.
Innovation Solution
A liquid chromatography system utilizing a combination of HILIC and reversed-phase chromatography in a two-dimensional high-performance liquid chromatography method, with a trapping column and solvent managers to create a combined mobile phase for effective separation of lipids, allowing for the use of mass spectrometry analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If reverse-phase chromatography is used to separate lipids, then separation based on hydrophobicity is achieved, but class distinction is lost
Solution Approach 1:
The invention divides the single-dimension separation into two sequential dimensions: first dimension (HILIC) separates lipid classes based on head group polarity, second dimension (reversed-phase) separates individual lipids within each class based on hydrophobicity. This segmentation resolves the contradiction by preserving class distinction in the first dimension while achieving precise separation in the second dimension.
Solution Approach 2:
The patent implements two-dimensional liquid chromatography (2D-LC) where the first dimension uses HILIC stationary phase and the second dimension uses reversed-phase stationary phase. This dimensional expansion allows simultaneous preservation of lipid class information and achievement of high-resolution separation within classes, directly resolving the information loss problem.
2Loss of information
If normal-phase and HILIC chromatography are used to separate lipids, then class distinction is achieved, but separation within classes is limited
Solution Approach 1:
The separation process is segmented into two functional stages: Stage 1 (HILIC column) performs class-level separation preserving head group information, Stage 2 (reversed-phase column) performs within-class separation achieving high resolution. This segmentation allows each stage to optimize for its specific separation goal without compromising the other.
Solution Approach 2:
By adding the second reversed-phase dimension after HILIC separation, the system expands from one-dimensional class separation to two-dimensional separation where the first dimension preserves class distinction and the second dimension provides enhanced within-class resolution, directly addressing the limited separation precision problem.
3Manufacturing precision
If two-dimensional chromatography is implemented, then lipid separation and class distinction are improved, but system complexity increases
Solution Approach 1:
The trapping column serves multiple functions: it acts as the second dimension stationary phase for separation, functions as a trap to accumulate analytes from the first dimension, and provides a interface between the two chromatographic dimensions. This multi-functionality reduces overall system complexity by eliminating the need for separate trapping mechanisms.
Solution Approach 2:
The trapping column acts as an intermediary component between the HILIC and reversed-phase columns, receiving eluent from the first dimension and transferring separated analytes to the second dimension. This intermediary structure simplifies the coupling of two different chromatographic systems by providing a unified platform for both separation and transfer functions.
4Quantity of substance
If trapping column is used to accumulate analytes, then dynamic range is improved, but additional column and solvent management are required
Solution Approach 1:
The trapping column simultaneously performs three functions: accumulates analytes to expand dynamic range, serves as the stationary phase for the second dimension separation, and acts as a transfer interface to the reversed-phase column. This multi-functionality means the additional hardware requirement also provides separation capability, partially offsetting the complexity increase.
Solution Approach 2:
The patent merges the trapping function with the second dimension separation function by using the trapping column as both the accumulation vessel and the stationary phase for reversed-phase separation. This merging eliminates the need for a separate trapping column and analysis column, reducing overall system complexity while maintaining dynamic range improvement.
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 enhances lipid separation by addressing co-elution and dynamic range issues, enabling rapid and effective analysis of lipid classes using mass spectrometry, improving the understanding of lipidomics and potential drug targets.
Implementation Method 1
The first column can be a HILIC column
Implementation Method 2
solvent dispensed by the second solvent manager is passed over the second column in a second direction to release the analytes of interest from the second column
Implementation Method 3
eluent from the first column is mixed with solvent dispensed by the second solvent manager in the mixer to produce a combined mobile phase
Data Source
AI summary
One aspect of the invention provides a liquid chromatography system including: a first solvent manager configured to dispense various ratios of a first solvent and a second solvent; a first column in fluid communication with the first solvent manager; a mixer in fluid communication with the first column; a first valve in fluid communication with the mixer; a second column having a first end in fluid communication with a first port of the first valve and a second end in fluid communication with a second port of the first valve; a second solvent manager adapted and configured to dispense various ratios of a third solvent and a fourth solvent; and a second valve in fluid communication with the second solvent manager, the first valve, and the mixer. The first valve and the second valve are adapted and configured for actuation between and a second position. In the first position: solvent dispensed by the first solvent manager and an injected sample flow over the first column; eluent from the first column is mixed with solvent dispensed by the second solvent manager in the mixer to produce a combined mobile phase; and the combined mobile phase is passed through the first valve and over the second column in a first direction to trap analytes of interest on the first column. In the second position, solvent dispensed by the second solvent manager is passed over the second column in a second direction to release the analytes of interest from the second column.