Partial Modulation in Two-Dimensional Chromatography
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Solution Overview
Problem
Comprehensive two-dimensional chromatography with full modulation faces challenges such as temperature and size limitations, power requirements, and longer secondary retention times, which can alter chemical properties of samples and restrict portability and efficiency.
Innovation Solution
A partial modulation method and device for multi-dimensional chromatography that uses a second carrier to partially modulate the sample between two concentrations by dilution, maintaining resolution and allowing for a shorter secondary retention time without altering the sample's temperature or stopping the primary carrier flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full modulation is used in comprehensive two-dimensional chromatography, then separation resolution is improved, but secondary retention time increases and temperature control becomes difficult
Solution Approach 1:
The patent applies partial modulation instead of full modulation, where the modulator only partially concentrates the analyte bands rather than completely stopping and re-injecting them. This partial action reduces the secondary retention time while still achieving sufficient separation resolution for comprehensive two-dimensional chromatography
2Measurement precision
If full modulation with carrier stopping is used, then separation resolution is improved, but temperature alteration of samples occurs
Solution Approach 1:
By using partial modulation where the carrier flow is reduced but not completely stopped, the patent avoids extreme temperature changes that would occur with full modulation. The sample temperature remains stable throughout the modulation process, preserving the chemical properties of thermally labile compounds
3Measurement precision
If full modulation is implemented, then separation resolution is improved, but equipment size and power requirements increase
Solution Approach 1:
The partial modulation approach requires a simpler modulator design compared to full modulation systems. The modulator only needs to partially restrict carrier flow rather than completely stop and reverse it, reducing the complexity and size of the modulation equipment while maintaining adequate separation resolution
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 approach enables faster secondary dimension separation while preserving the chemical properties of the sample, reducing equipment size and power needs, and improving data interpretation by maintaining the integrity of the primary signal with orthogonal separation in the secondary column.
Implementation Method 1
the primary-column separated sample-bearing first carrier is partially modulated by modulation between two concentrations by dilution with a second carrier
Implementation Method 2
Comprehensive two-dimensional liquid or gas chromatography utilizes two orthogonal columns connected in series to separate compounds within a sample
Data Source
AI summary
This invention is a method and device for use with multi-dimensional chromatography that utilizes partial modulation. An analyte-bearing sample is subjected to a first dimension of chromatography. Thereafter the separated analyte-bearing sample is diluted with a modulated second carrier such at the analyte-bearing sample is not stopped or its temperature altered. The partially modulated analyte-bearing sample then feeds into a secondary column where the analyte-bearing sample is further separated.