Probe Electrospray Ionization for Polar Compound Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current mass spectrometry methods, such as ESI and MALDI, face challenges in accurately measuring highly polar compounds due to ion suppression or enhancement from complex matrices, requiring separation steps and pretreatments, which increase analysis time and complexity, and are inefficient for highly polar compounds like aminoglycoside-based antibacterial agents.
Innovation Solution
A method using probe electrospray ionization (PESI) with a conductive probe coated with an extraction phase for adsorbing and desorbing target components, allowing for direct identification without separation or pretreatment, utilizing a mass spectrometer with a voltage generation unit to electrospray aerosolized droplets for ionization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separation steps and pretreatments are performed using conventional ESI or MALDI methods, then measurement accuracy is improved, but analysis time increases and procedure complexity increases
Solution Approach 1:
The patent combines the extraction phase coating directly on the probe with the electrospray ionization function, merging what were previously separate steps (extraction/separation and ionization) into a single integrated probe system. This eliminates the need for separate LC/GC separation steps while maintaining measurement accuracy for highly polar compounds.
Solution Approach 2:
The extraction phase coating on the probe serves as an intermediary that selectively adsorbs target components from complex matrices before electrospray ionization. This intermediary layer prevents ion suppression/enhancement effects from the matrix while enabling direct analysis without time-consuming separation steps.
2Measurement precision
If separation steps and pretreatments are performed using conventional ESI or MALDI methods, then measurement accuracy is improved, but procedure complexity increases
Solution Approach 1:
The patent merges the extraction phase with the probe structure itself, creating a single integrated component that performs both sample extraction and electrospray ionization. This eliminates multiple separate devices and procedures (LC/GC systems, separate extraction steps) while maintaining measurement accuracy.
Solution Approach 2:
The probe with extraction phase coating serves multiple functions simultaneously: it acts as an extraction medium, a separation interface, and an electrospray emitter. This multi-functionality eliminates the need for separate pretreatment and analysis equipment, simplifying the overall procedure while maintaining accuracy.
3Measurement precision
If conventional LC-MS or LC-MS/MS is used for highly polar compounds, then measurement capability is achieved, but analysis complexity and burden on analyst increases
Solution Approach 1:
The patent extracts only the essential function needed for analyzing highly polar compounds by placing an extraction phase directly on the probe. This removes the complex LC/GC separation system entirely, retaining only the critical extraction and ionization functions needed for accurate measurement of highly polar compounds.
Solution Approach 2:
The patent replaces the mechanical separation system (LC/GC columns, pumps, flow systems) with a simpler probe-based extraction and direct electrospray system. This substitution eliminates complex mechanical components while maintaining the ability to measure highly polar compounds accurately.
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 high-quantitative accuracy and reduced analysis time by eliminating the need for separation steps and pretreatments, effectively measuring highly polar compounds that are difficult with conventional GC/MS or LC/MS.
Implementation Method 1
adsorbing the target component of interest onto an extraction phase for adsorbing the target component of interest from the specimen
Implementation Method 2
desorbing the target component of the interest into the solvent adhered to the probe from the extraction phase
Implementation Method 3
electrospraying the target component of interest desorbed in the solvent adhered to the probe on the ionization source at atmospheric pressure by applying a voltage to the probe to spray aerosolized ionized droplets out of the probe
Data Source
AI summary
A method for identifying a target component of interest in a specimen by probe electrospray ionization mass spectrometry, including: (1) adsorbing the target component of interest onto an extraction phase for adsorbing the target component of interest from the specimen by immersing a probe into the specimen, wherein the probe is at least partially coated with the extraction phase; (2) removing the probe from the specimen and optionally quick rising it by dipping in or spraying water or acetone/water mixtures; (3) adhering solvent to the extraction phase; (4) desorbing the target component of interest into the solvent from the extraction phase; (5) electrospraying the target component of interest desorbed in the solvent adhered to the probe on the ionization source at atmospheric pressure by applying a voltage to the probe to spray aerosolized ionized droplets out of the probe; and (6) identifying the target component of interest present in the aerosolized ionized droplets.