Microfabricated Extraction Device Prevents Chromatography Column Degradation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for extracting and analyzing volatile organic compounds (VOCs) from liquids in gas phase chromatography are either costly, bulky, and lack sensitivity, or they degrade the chromatography column by circulating liquids, which limits their effectiveness and portability.
Innovation Solution
A microfabricated extraction device with an adsorption surface, capable of circulating liquids for analyte capture, followed by drying and carrier gas desorption, which prevents liquid circulation in the chromatography column, allowing for automatic, sensitive, and portable analysis without degrading the column.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If liquid is circulated through the chromatography column for extraction, then analyte capture is achieved, but the column stationary phase is degraded
Solution Approach 1:
The system is divided into separate functional zones: a liquid circulation zone for analyte capture, a drying zone for liquid removal, and a gas circulation zone for desorption and transfer. This segmentation allows liquid extraction without direct contact with the chromatography column, preventing stationary phase degradation while maintaining analyte capture efficiency.
Solution Approach 2:
A drying gas acts as an intermediary medium between the liquid sample and the chromatography column. The gas circulates through the extraction zone to remove liquid and then transports desorbed analytes to the column, eliminating direct liquid-column contact while enabling analyte transfer.
2Weight of moving object
If manual extraction methods are used, then portability is improved, but automation and sensitivity are reduced
Solution Approach 1:
Multiple functions are merged into a single integrated microfabricated device: liquid circulation, analyte adsorption, drying gas circulation, carrier gas desorption, and analyte transfer all occur within one compact unit. This combination enables automated operation while maintaining portability, as the entire extraction and transfer process occurs without manual intervention.
Solution Approach 2:
The system performs automated cyclic operation where switching means automatically alternate between liquid circulation mode and gas circulation mode. The drying gas automatically removes liquid and the carrier gas automatically transports desorbed analytes, eliminating the need for manual operations while maintaining a compact design.
3Measurement precision
If fiber extraction is used, then sensitivity is improved through concentration, but device complexity and cost increase
Solution Approach 1:
The extraction zone serves multiple functions: it acts as an adsorption surface for analyte capture during liquid circulation, a drying chamber during gas circulation, and a desorption zone when carrier gas flows through. This multi-functionality eliminates the need for separate extraction and transfer devices, reducing overall system complexity while maintaining concentration capability.
Solution Approach 2:
The system uses gas flow dynamics to achieve both drying and desorption functions. Drying gas removes liquid from the extraction zone, and carrier gas transports desorbed analytes to the chromatography column. This pneumatic approach replaces complex mechanical transfer mechanisms, simplifying the device structure while maintaining analytical sensitivity.
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
Enables efficient, sensitive, and rapid analysis of VOCs in liquids with improved capture surface area and flow rates, preventing column saturation and degradation, while being compact and cost-effective.
Implementation Method 1
a zone for extracting and desorbing said analyte, provided with a stationary phase, called the extraction zone
Implementation Method 2
the supply inlet is configured to circulate the drying gas to the extraction zone and the exhaust outlet is configured to send the drying gas to the collection zone
Implementation Method 3
the supply inlet is configured to circulate the carrier gas in the extraction zone and the exhaust outlet is configured to send the carrier gas to the analysis device, the carrier gas transporting the desorbed analytes
Implementation Method 4
desorption assistance means
Data Source
Figure 1~2
Figure 3A~3C
AI summary
The invention relates to a device for extracting at least one analyte contained in a liquid, comprising: a zone (4) equipped with a stationary phase for extracting and desorbing said analyte, called the extracting zone; an inlet for supplying liquid to the extracting zone (4); an inlet for supplying gas to the extracting zone (4); an outlet for expelling analytes from the extracting zone (4), which outlet is intended to be connected either to a collecting reservoir (20) or to a device (18) for analysing said analytes; a valve (10) capable of connecting the extracting zone (4) to one of the supplying inlets; a valve (16) capable of connecting the extracting zone (4) to one of the expelling outlets; and means for heating the valve regions (10, 16), so that when the extracting zone (4) is supplied with liquid analytes are expelled from the extracting zone (4) into the collecting reservoir.