Parallel Sample Reservoirs for HPLC Pressure Stability
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Solution Overview
Problem
High performance liquid chromatography (HPLC) systems face challenges in maintaining consistent pressure and flow during sample introduction, particularly in two-dimensional HPLC applications, leading to pressure variations, column deterioration, and reduced separation efficiency due to abrupt changes in flow and pressure.
Innovation Solution
A sample dispatcher system that uses multiple sample reservoirs to manage and dilute sample fluids, allowing for continuous pressure and flow supply by coupling reservoirs in parallel, reducing pressure variations, and enabling efficient dilution and pre-compression of samples to minimize column stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sample reservoirs are coupled in parallel between mobile phase drive and separation unit, then pressure variations are reduced and continuous flow is maintained, but device complexity increases
Solution Approach 1:
The sample introduction system is segmented into multiple independent sample reservoirs (first sample reservoir, second sample reservoir) that can be selectively coupled to the separation unit. Each reservoir operates independently, allowing one to be introduced while another is prepared or cleaned, thereby maintaining continuous flow and reducing pressure variations.
Solution Approach 2:
The system performs preliminary actions by pre-filling multiple sample reservoirs with sample portions before separation is needed. This allows the system to switch between reservoirs without interruption, maintaining continuous mobile phase flow through the separation unit and avoiding pressure drops that would occur with single-reservoir systems requiring sequential filling and introduction.
2Manufacturing precision
If sample fluid is introduced directly into high pressure flow path, then separation efficiency is maintained, but column deterioration occurs due to pressure shocks
Solution Approach 1:
The sample reservoir acts as an intermediary component between the sample introduction system and the high-pressure separation unit. By coupling the reservoir in parallel with the mobile phase drive, the system allows sample to be introduced through a pressure-equilibrated pathway, preventing pressure shocks and mechanical stress on the separation column while maintaining separation efficiency.
Solution Approach 2:
The system provides beforehand cushioning by pre-compressing the sample fluid in the sample reservoir to match the high pressure of the mobile phase before introduction. This gradual pressure equalization prevents sudden pressure shocks to the separation column, cushioning it against mechanical stress and extending column longevity while maintaining separation performance.
3Productivity
If sample portions are introduced sequentially into mobile phase flow, then separation of multiple compounds is achieved, but pressure ripples occur during switching
Solution Approach 1:
The system ensures continuity of useful action by maintaining constant mobile phase flow through the separation unit at all times. Multiple sample reservoirs are coupled in parallel, allowing seamless switching between them without interrupting the flow path, thereby eliminating pressure ripples that would occur during sequential introduction while maintaining high throughput for separating multiple compounds.
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
The system ensures continuous pressure and flow supply, reduces pressure variations, and enhances chromatographic performance by maintaining consistent sample introduction, thereby improving separation efficiency and extending column longevity.
Implementation Method 1
allowing dilution of the respective sample fluid portion with the mobile phase
Implementation Method 2
enabling efficient dilution and pre-compression of samples to minimize column stress
Implementation Method 3
The mobile phase, for example a solvent, is pumped under high pressure typically through a chromatographic column containing packing medium
Implementation Method 4
For liquid separation in an HPLC system, a mobile phase comprising a sample fluid (e.g. a chemical or biological mixture) with compounds to be separated is driven through a stationary phase (such as a chromatographic column packing), thus separating different compounds of the sample fluid
Data Source
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Figure 3A~3D
AI summary
Disclosed is a sample dispatcher configured for individually introducing a plurality of portions of one or more sample fluids into a flow of a mobile phase of a separation system configured for separating compounds of the sample fluids. The separation system 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 a plurality of sample reservoirs, each configured for receiving and temporarily storing a respective sample fluid portion or at least a part thereof. The sample dispatcher is configured for selectively coupling one of the plurality of sample reservoirs between the mobile phase drive and the separation unit, and further for coupling at least two of the plurality of sample reservoirs in parallel between the mobile phase drive and the separation unit.