Eluate Fractionator Segmentation for LC Stability
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Solution Overview
Problem
Current liquid chromatography systems using vibrational spectroscopy face challenges in controlling the mobile phase flow rate with high accuracy, particularly at nano liquid chromatography (nano LC) levels, leading to instability and limited types of separation columns that can be used, restricting the kinds of substances that can be separated.
Innovation Solution
A preparative liquid chromatograph system that includes a liquid feeding pump, injector, separation column, and an eluate fractionator to divide the eluate flow into a minute flow rate and another flow, allowing extraction and drying of the eluate into a fractionation container, enabling the use of a larger mobile phase flow rate and improving stability and the range of separable substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a nano liquid chromatograph is used to reduce mobile phase flow rate for quick drying, then drying speed is improved, but liquid feeding stability deteriorates due to pulsation and control difficulty
Solution Approach 1:
The eluate flow is segmented into two separate flows: a minute flow rate stream directed to the fractionation container for drying, and another flow stream. This segmentation allows the system to use a larger overall mobile phase flow rate while still providing a small enough flow to the detection path for efficient drying and solidification.
2Loss of time
If a nano liquid chromatograph is used to reduce mobile phase flow rate, then drying efficiency is improved, but the number of available separation columns is reduced
Solution Approach 1:
By segmenting the eluate flow into a minute flow rate stream for the fractionation container and another flow stream, the system enables the use of conventional LC columns with larger flow rate capacities while still achieving the low flow rate conditions needed for efficient drying and solidification in the detection path.
3Measurement precision
If mobile phase flow rate is reduced to nL/min order for vibrational spectroscopy detection, then detection capability is improved, but liquid feeding control accuracy becomes difficult to achieve
Solution Approach 1:
The system segments the mobile phase flow into a large flow rate through the separation column and a minute flow rate through the fractionation container to the detection path. This allows the use of conventional LC pumps with better flow control accuracy while still achieving the low flow rate conditions required for effective vibrational spectroscopy detection and drying.
4Loss of time
If eluate flow rate is reduced for efficient drying, then drying efficiency is improved, but the system complexity increases due to additional flow control requirements
Solution Approach 1:
The eluate flow is segmented into two streams using a flow divider in the fractionation container: a minute flow rate stream that is extracted and dried for detection, and another flow stream. This segmentation achieves efficient drying without requiring complex flow control mechanisms, as the flow division is accomplished through the fractionation container design rather than additional pumps or flow controllers.
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 allows for stable liquid feeding and the use of a wider range of separation columns, enabling the combination of vibrational spectroscopy detectors with LC systems having larger mobile phase flow rates than nano LC, enhancing analysis capabilities.
Implementation Method 1
a separation column for separating components in the sample injected into the mobile phase by the injector
Implementation Method 2
an eluate drying/solidifying unit for drying and solidifying the eluate may be separately provided
Data Source
AI summary
A preparative liquid chromatograph includes a liquid feeding pump (2) that feeds a mobile phase, an injector (4) that injects a sample into the mobile phase at a downstream of the liquid feeding pump (2), a separation column (6) for separating components in the sample injected into the mobile phase by the injector (4) at a downstream of the injector (4), and an eluate fractionator (8) configured to divide a flow of the eluate from the separation column (6) into a flow of a minute flow rate and another flow at a downstream of the separation column (6) and to extract at least a part of an eluate that forms the flow of a minute flow rate into an fractionation container (22).