Segmented Sample Container for HPLC Switching Reduction
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Solution Overview
Problem
High-performance liquid chromatography (HPLC) systems face challenges in efficiently handling and separating sample fluids due to issues like pressure shocks, column deterioration, and potential for sample loss and contamination, particularly when handling multiple sample loops and switching steps, which can lead to inaccurate results and increased complexity.
Innovation Solution
A sampling unit that configures a sample container into multiple volume segments, allowing for 'one-shot' storage and sequential dispatch of individual sample packages with reduced switching steps, minimizing contamination and sample loss, and enabling efficient processing in HPLC systems by using a valve with a rotor and stator configuration to physically isolate and decouple sample loops for individual access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple sample loops and switching steps are used to handle sample packages, then sample processing capability is improved, but device complexity and risk of contamination increase
Solution Approach 1:
The sample container is divided into multiple discrete sample packages along its length, each package being independently accessible. This segmentation allows sequential processing of multiple samples without requiring complex switching mechanisms between separate loops, thereby maintaining productivity while reducing device complexity
Solution Approach 2:
Multiple sample packages are pre-loaded into the sample container before the analysis sequence begins. This preliminary action eliminates the need for repeated switching operations during the analytical run, reducing both device complexity and the risk of contamination while maintaining high sample processing capability
2Adaptability or versatility
If multiple switching steps are used to access different sample loops, then sample versatility is improved, but sample loss and contamination risk increase
Solution Approach 1:
Individual sample packages are extracted from the sample container one at a time and delivered directly to the chromatographic column. This extraction approach eliminates the need for switching between multiple connected sample loops, thereby reducing contamination risk while maintaining the ability to process diverse samples
Solution Approach 2:
A single sample container serves as an intermediary that holds multiple discrete sample packages. This intermediary structure allows versatile sample access without requiring multiple switching operations, thereby reducing contamination risk while maintaining sample versatility
3Speed
If abrupt reconnection to high pressure sources is performed, then processing speed is improved, but column deterioration accelerates
Solution Approach 1:
The system gradually increases pressure when connecting the sample container to the high-pressure pump, rather than making abrupt connections. This beforehand cushioning protects the chromatographic column from pressure shocks while maintaining efficient processing speed, thereby extending column lifespan
Data Source
AI summary
A sampling unit for handling a sample fluid includes a sample container having a length and being configured for receiving and storing the sample fluid, and a sample segment dispatching unit configured for providing a plurality of individual sample packages of the fluidic sample, each contained in a respective volume segment along the length of the sample container, and for individually dispatching each of the plurality of individual sample packages for further processing in a fluid processing unit. The sample unit may be utilized, for example, for injecting the sample packages into a mobile phase stream for transporting to a sample separating unit such as a chromatography column.