HPLC Sample Dispatcher Bypass Channel Pressure Management
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Solution Overview
Problem
High performance liquid chromatography (HPLC) systems face challenges in maintaining efficient sample introduction and separation, particularly in two-dimensional HPLC applications, where pressure variations and solvent strength issues lead to column deterioration and poor separation efficiency.
Innovation Solution
A sample dispatcher system with multiple reservoirs and a bypass channel allows for controlled dilution and pressure management by selectively coupling reservoirs and the bypass channel between the mobile phase drive and the separation unit, reducing pressure ripples and optimizing solvent strength during sample introduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sample introduction is performed in two-dimensional HPLC with frequent switching between sample reservoirs and separation units, then sample separation capability is improved, but pressure ripples and pressure drops occur leading to column deterioration
Solution Approach 1:
A bypass channel is introduced as an intermediary flow path between the sample reservoir and separation unit. This bypass channel allows mobile phase to flow continuously while sample transfer occurs, mediating between the need for frequent sample introduction and the need to maintain stable pressure conditions for column protection
Solution Approach 2:
The flow path is segmented into multiple independent channels: a sample transfer channel and a bypass channel. This segmentation allows the sample transfer operations to occur in one channel while the bypass channel maintains continuous mobile phase flow and stable pressure, isolating the pressure disturbances caused by sample introduction
2Productivity
If sample reservoirs are frequently coupled and decoupled from the separation unit, then comprehensive 2D LC analysis is enabled, but pressure drops and flow disruptions occur
Solution Approach 1:
The bypass channel serves as a mediator that maintains continuous mobile phase flow between the sample reservoir and separation unit. Even when sample reservoirs are being coupled or decoupled, the bypass channel ensures uninterrupted flow, stabilizing the hydraulic conditions and preventing pressure drops that would otherwise occur during switching operations
3Productivity
If the mobile phase flow rate is increased to reduce cycle times, then productivity is improved, but pressure variations and column wear increase
Solution Approach 1:
The bypass channel enables continuous mobile phase flow throughout the sample introduction process. This continuity allows the system to maintain higher flow rates and shorter cycle times without creating pressure variations, because the bypass channel compensates for any disruptions caused by sample reservoir switching, thereby reducing column wear even at higher productivity levels
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 configuration enhances separation efficiency, reduces column wear, and allows for continuous high-pressure flow, enabling faster cycle times and improved resolution in HPLC systems, particularly in comprehensive 2D LC applications.
Implementation Method 1
The mobile phase, for example a solvent, is pumped under high pressure typically through a chromatographic column containing packing medium
Implementation Method 2
a first separation procedure in a first separation unit is performed to separate a fluidic sample into a plurality of fractions, and in which a subsequent second separation procedure in a second separation unit is performed to further separate the plurality of fractions into sub-fractions
Implementation Method 3
it may be of advantage to dilute the sample plug (sniplet) coming from the collection loop before it hits the column
Implementation Method 4
The sample and fraction pathway switching may result in pressure ripples or dips acting on separation units and other components of the liquid separation system
Data Source
AI summary
A sample dispatcher is disclosed and is configured for individually introducing a plurality of portions of one or more sample fluids into a flow of a mobile phase of a liquid separation system. The liquid separation system is configured for separating compounds of the sample fluids and comprises a mobile phase drive configured for driving the mobile phase through a separation unit configured for separating compounds of the sample fluids in the mobile phase. The sample dispatcher comprises one or more sample reservoirs, each configured for receiving and temporarily storing a respective sample fluid portion or at least a part thereof, and a bypass channel.