Liquid Chromatography Flow Channel Conditioning for Peak Separation
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Solution Overview
Problem
In hemoglobin analysis by liquid chromatography, the measurement flow channel becomes dirty, leading to deteriorated separability of adjacent peaks due to hemoglobin adsorption on the metal surface, which is exacerbated after cleaning with hypochlorous acid, making it difficult to achieve accurate peak separation.
Innovation Solution
A conditioning treatment is performed by flowing a liquid containing albumin, casein, or skim milk through the measurement flow channel before analysis, which suppresses non-specific binding of hemoglobin to the metal surface, thereby improving peak separability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal flow channel is used to secure mechanical strength under high pressure, then the structural integrity is improved, but hemoglobin adsorption increases causing deteriorated peak separability
Solution Approach 1:
The patent introduces a porous coating layer as an intermediary substance between the metal flow channel and hemoglobin. This coating layer serves as a mediator that prevents direct contact between hemoglobin and the metal surface, thereby eliminating the harmful adsorption effect while maintaining the structural integrity of the metal flow channel.
Solution Approach 2:
The patent applies a thin porous coating film on the inner surface of the metal flow channel. This thin film structure provides sufficient coverage to prevent hemoglobin adsorption while maintaining the mechanical strength of the underlying metal structure and allowing fluid flow through its porous nature.
2Object-generated harmful factors
If the measurement flow channel is cleaned with hypochlorous acid, then the cleanliness is improved, but the separability of adjacent peaks deteriorates due to adsorption on the clean metal surface
Solution Approach 1:
The patent applies the porous coating to the metal flow channel before cleaning operations. This preliminary protective layer ensures that even after cleaning with hypochlorous acid, the metal surface remains covered and does not directly contact hemoglobin, thus preventing adsorption-related peak separation deterioration while maintaining cleanliness.
3Productivity
If repeated hemoglobin analysis is performed, then the productivity is improved, but the flow channel becomes dirty leading to deteriorated separability
Solution Approach 1:
The patent creates a replicated protective interface by applying the porous coating that mimics the desired non-adsorbing surface properties. This coating layer is formed once on the metal flow channel and provides continuous protection during repeated analyses, eliminating the need for frequent cleaning while maintaining peak separability throughout extended use.
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 conditioning treatment effectively prevents hemoglobin adsorption, enhancing the separability of adjacent peaks and maintaining peak integrity, as demonstrated by improved chromatogram results and increased degree of separation between peaks.
Implementation Method 1
a conditioning treatment by causing a conditioning liquid, in which albumin, casein, or skim milk is dissolved, to flow through a measurement flow channel of a liquid chromatography device for analyzing hemoglobin in a specimen
Data Source
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AI summary
A method of treating a measurement flow channel (40, 50), the method comprising performing a conditioning treatment by causing a conditioning liquid, in which albumin, casein, or skim milk is dissolved, to flow through a measurement flow channel (40, 50) of a liquid chromatography device (10) for analyzing hemoglobin in a specimen before analyzing the hemoglobin.