Staged Preconcentration Parallel Column Gas Chromatography
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Solution Overview
Problem
Conventional gas chromatography (GC) techniques require high temperatures and inert gases, making them impractical for use in ubiquitous environments outside laboratories or clinics, where helium or nitrogen may not be available, and the separation of higher molecular weight volatile analytes is time-consuming.
Innovation Solution
A device with multiple sections coated with sorbents of varying affinities for volatile analytes, allowing for staged preconcentration and parallel extraction, using a conduit with injection and exhaust ports for efficient desorption and separation, and optional thermal insulation for controlled heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional GC techniques are used with high temperatures and inert gases, then separation of volatile analytes is achieved, but the method becomes impractical for ubiquitous environments and requires time-consuming separation of higher molecular weight analytes
Solution Approach 1:
The preconcentration device is divided into multiple sections, each coated with different sorbents having varying affinities for volatile analytes. This segmentation allows different analytes to be captured at different stages, enabling faster elution without requiring high temperatures or inert gases, thus making the system adaptable to ubiquitous environments while reducing separation time.
Solution Approach 2:
Volatile analytes are preconcentrated before GC analysis by passing the sample through the multi-section preconcentration device where analytes are adsorbed onto sorbents. This preliminary concentration step enhances the detection sensitivity and allows for faster subsequent analysis, reducing the overall time required while maintaining adaptability to various environments.
2Productivity
If high temperatures are used to elute analytes with higher affinity to the column, then separation is completed faster, but oxygen reacts with analytes and column at elevated temperatures degrading sample and column
Solution Approach 1:
The invention changes the operational parameters by using a multi-section preconcentration approach with different sorbent affinities instead of relying on high temperature elution. This allows analytes to be separated at lower temperatures, preventing oxidation and degradation while maintaining productive separation speeds through the staged elution mechanism.
3Measurement precision
If multiple sorbents with different affinities are used in the conduit, then staged preconcentration is achieved, but device complexity increases
Solution Approach 1:
The preconcentration device is divided into multiple sections, each coated with different sorbents having varying affinities for volatile analytes. This segmentation allows different analytes to be captured at different stages, enhancing measurement precision while keeping the device structure manageable through modular design.
Solution Approach 2:
The multi-section conduit serves multiple functions: it preconcentrates different analytes simultaneously, separates them based on affinity, and prepares them for GC analysis. This multi-functionality achieves high measurement precision without proportionally increasing device complexity, as the same structure performs multiple analytical tasks.
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 faster GC runs without high temperatures, facilitating sample preparation in mobile or home settings by efficiently extracting and preconcentrating volatile analytes, reducing the need for inert gases and shortening separation times.
Implementation Method 1
a sorbent which adsorbs volatile compounds from the sample
Implementation Method 2
the partitioning of analytes between the liquid and gas phases in the headspace
Implementation Method 3
the sorbent is heated to eject the adsorbed volatiles into a GC column
Implementation Method 4
The needle trap moves air from the headspace through a preconcentrator needle in one direction
Implementation Method 5
The higher affinity volatile analytes may be released more quickly by heating the column
Data Source
AI summary
We disclose a device that both extracts and preconcentrates volatile analytes in preparation for separation by gas chromatography. The device includes a conduit that may include two, and sometimes three, separate sections that are connected end-to-end, but which may be separated prior to inserting into a gas chromatograph port. The inner surface of each section is coated with one or more sorbents, each with a different affinity for volatile analytes. The sorbents may be positioned along the sections of the column in order of relative affinity for volatile analytes. The sections may be heated independently of each other to release the volatile analytes from the sorbents more quickly. This device reduces the time and the temperature required to achieve separation by gas chromatography. The device may be used to perform gas chromatography in ubiquitous environments such as the home or a mobile situation.