Sample Section Barriers Prevent Carryover in HPLC
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Solution Overview
Problem
In high-performance liquid chromatography (HPLC) systems, there is a risk of unwanted sample carryover during the transfer of sample sections from the first separation stage to the second stage, leading to artifacts in the chromatogram and reduced detection accuracy.
Innovation Solution
A fluid processing device with multiple sample receiving volumes and a control device that ensures successive sample sections are filled and emptied in a way that prevents direct contact between non-adjacent sections, using a 'last in, first out' (LIFO) logic to manage sample sections and assignment information for chronological processing, thereby avoiding contamination and artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sample sections are temporarily stored in liquid containers between fluid ports during two-dimensional chromatography, then continuous intermediate storage is enabled without loss of sample liquid, but unwanted sample carryover occurs leading to artifacts in the chromatogram
Solution Approach 1:
A sample section barrier is introduced as an intermediary element between successive sample sections in the temporary storage capillary. This barrier physically separates adjacent sample sections, preventing direct contact and carryover while allowing continuous storage and processing of multiple fractions without loss of sample liquid.
Solution Approach 2:
The sample stream is segmented into discrete sample sections with defined boundaries. Each sample section is treated as a separate entity that can be independently stored, processed, and analyzed in the second dimension without interference from adjacent sections, enabling reliable multi-fraction handling.
2Productivity
If multiple fractions are processed simultaneously in two-dimensional chromatography, then separation efficiency is improved, but sample sections that are not immediately adjacent may come into contact during emptying causing contamination
Solution Approach 1:
The sample section barrier acts as a mediator that allows multiple fractions to be stored and processed simultaneously while maintaining strict separation. The barrier ensures that even when capillaries are switched and emptied in different sequences, non-adjacent sample sections cannot mix, preserving detection accuracy while enabling efficient parallel processing.
Solution Approach 2:
Sample section barriers are placed in advance between sample sections during the filling phase, before any emptying or processing occurs. This preliminary separation ensures that subsequent processing operations can proceed without risk of carryover, enabling confident parallel fraction handling.
Data Source
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AI summary
Disclosed is a method for processing successive fluid sample portions (104) supplied by a sample source (112); in said method, sample holding volumes (180) are successively temporarily filled with at least one of the sample portions (104), and the sample portions (104) are successively emptied out of the sample holding volumes (112) in such a way that contact between two sample portions (104) that have not been withdrawn from the sample source (112) immediately adjacent to one another is prevented.