Desolvation Interface with Compression Region for LC-MS
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Solution Overview
Problem
Existing methods for desolvating flowing liquid chromatography effluents suffer from limited sensitivity, solute loss, and degradation of chromatographic resolution due to particle size dependency and inefficient solvent removal, particularly during high-velocity deposition and vacuum conditions.
Innovation Solution
A novel interface comprising a perforated extraction barrier and compression region with controlled gas counterflow and electro-optical compression, which directs electrically charged solute particles through a series of lenses to focus them onto a deposition surface at ambient pressure, enhancing transmission efficiency and reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional desolvation method is used to remove solvent vapor, then solvent removal efficiency is improved, but solute loss increases due to particle size dependency and inefficient separation
Solution Approach 1:
The interface is divided into multiple functional zones: a first zone for initial solvent vapor removal and a second zone for focused solute particle extraction. This segmentation allows each zone to optimize its function - the first zone handles bulk solvent removal while the second zone carefully extracts solute particles, thereby improving solvent removal efficiency while minimizing solute loss.
Solution Approach 2:
Solute particles are selectively extracted from the solvent vapor stream using an extraction barrier with apertures. The extraction barrier allows solvent vapor to pass through while retaining and directing charged solute particles into the compression zone, achieving efficient solvent removal without significant solute loss.
2Productivity
If high-velocity deposition is used to increase productivity, then deposition speed is improved, but chromatographic resolution degrades due to particle size dependency
Solution Approach 1:
The compression zone applies localized electrostatic fields through compression lenses to focus solute particles onto the deposition surface. This localized focusing maintains high deposition speed while ensuring that particles are delivered with precise spatial control, thereby preserving chromatographic resolution despite high-velocity conditions.
Solution Approach 2:
The system changes the velocity parameter dynamically - particles are accelerated to high velocity for efficient transport and deposition, but are focused and controlled in the compression zone to maintain resolution. The extraction barrier aperture size and electric field strength are adjusted to optimize both speed and resolution.
3Loss of energy
If vacuum conditions are applied to enhance solvent removal, then solvent vapor removal is improved, but solute particle loss increases
Solution Approach 1:
The extraction barrier is designed with asymmetric properties - it is permeable to solvent vapor molecules while being impermeable to charged solute particles. This asymmetry allows solvent vapor to pass through under vacuum conditions while solute particles are retained and directed into the compression zone, enabling effective solvent removal without solute particle loss.
4Quantity of substance
If the deposition area is increased to accommodate more solute, then solute capacity is improved, but sensitivity and concentration decrease
Solution Approach 1:
The compression lenses focus solute particles onto a narrow linear track on the deposition surface rather than spreading them over a large area. This dimensional change from area-based deposition to line-based deposition allows high solute capacity while maintaining high concentration and sensitivity, as particles are concentrated along a focused path.
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 solution minimizes solute loss, improves sensitivity and reproducibility, and increases compatibility with various samples and solvents by concentrating solutes onto a smaller area, maintaining chromatographic resolution and integrity.
Implementation Method 1
the electrically charged solute particles are separated from the solvent vapor by a repeller electrode that serves to repel the electrically charged particles from the solvent vapor exhaust path
Implementation Method 2
the compression region of the interface that utilizes influence of both reduced turbulence and electric fields to compress the cross-section of the charged particle beam
Implementation Method 3
The chamber surface is heated to a temperature sufficient to cause the droplets to film boil
Implementation Method 4
When the electrically charged droplets containing solute particles are sufficiently small, stokes drag from the evaporated solvent gas carries the solute particles toward the center of the chamber
Implementation Method 5
Centrifugal force causes the larger liquid droplets to travel along the outer diameter of the chamber
Implementation Method 6
The liquid eluent is pumped through a heated nebulizer to create a charged aerosol comprising solute containing liquid droplets and solvent vapor
Data Source
AI summary
Interface (350) for the controlled transport of a flow of an inlet mixture (352), in solution or suspension, towards a target zone, preferably towards a deposition surface (610), characterized in that it comprises:—a perforated extraction barrier (402) comprising at least one laminar element perforated with a plurality of holes intended to be crossed by a flow of said mixture (352), said perforated extraction barrier (402) being positioned at the entrance of a compression region (560) configured to reduce the cross section of said flow (352),—said compression region (560) being fluidically connected with at least one opening for the inlet of a gas counterflow (606),—said compression region (560) being fluidically connected with an exhaust circuit (508) for at least one gas, said exhaust circuit (508) being positioned between the perforated extraction barrier (402) and the opening for the inlet of said gas counterflow (606).