Electrospray Column Equipotential Layout for Sharp Chromatographic Peaks
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Solution Overview
Problem
Conventional electrospray systems with chromatographic columns having conductive or semiconductive stationary phases face issues such as leakage currents, charging of the column, and band broadening due to current flow through the column, which affect analyte separation and retention time.
Innovation Solution
The system employs an electrical conductor to create a high voltage equipotential between the ends of the chromatographic column, limiting or eliminating current flow through the column, and uses a single post-column fluidic connection to reduce band broadening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a chromatographic column with conductive or semiconductive stationary phase is used in an electrospray system, then the column can be utilized for analyte separation, but leakage currents flow through the column causing charging effects and band broadening
Solution Approach 1:
The patent applies the equipotentiality principle by connecting both ends of the chromatographic column to the same electrical potential through the high voltage power supply. This creates an equipotential field across the column, eliminating voltage differences that would otherwise drive leakage currents through the conductive stationary phase, thereby preventing charging effects and band broadening while maintaining analyte separation capability
2Productivity
If high voltage is applied to the electrospray emitter, then ionization efficiency is improved, but current flow through the chromatographic column causes band broadening and reduced separation resolution
Solution Approach 1:
By establishing equipotential conditions at both ends of the chromatographic column through the high voltage power supply connection, the patent eliminates the voltage gradient that would drive current through the column. This allows high voltage to be applied to the electrospray emitter for efficient ionization without causing current flow through the stationary phase, thereby maintaining both high ionization efficiency and sharp analyte separation peaks
Solution Approach 2:
The patent extracts the harmful current flow path from the system by providing an alternative electrical connection path through the power supply that bypasses the chromatographic column. The electrical circuit is configured so that high voltage current flows through the electrospray emitter for ionization but does not flow through the chromatographic column, separating the useful ionization function from the harmful current-induced band broadening
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 improves chromatographic performance by preventing charging of the stationary phase, reducing peak broadening, and maintaining high resolution in analyte separation, while enabling accurate measurement of electrospray current.
Implementation Method 1
an electrical conductor connected to the post-column fluid union and the first pre-column fluid junction to equalize electrical potential between the post-column fluid union and the first pre-column fluid junction
Implementation Method 2
a high voltage is applied to a liquid to create charged droplets which desolvate to form gas phase ions
Data Source
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AI summary
Systems, methods, and cartridges taught herein improve chromatographic performance in electrospray systems that feature chromatographic columns having a conductive or semiconductive stationary phase by electrically connecting a fluid junction located upstream of the chromatographic column to a fluid union located downstream of the chromatographic column using an electrical conductor. The electrical conductor creates a voltage equipotential between a first end of the chromatographic column and a second end of the chromatographic column that neutralizes current flow through the chromatographic column. Accurate electrospray current measurements are enabled while post-column peak dispersion and repeatable retention time are achieved.