Vibrating Sharp-Edge Ionization for Zero-Voltage Mass Spectrometry
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Solution Overview
Problem
Current mass spectrometry techniques face challenges with high voltage requirements, complex sample preparation, and compatibility issues with separation methods like capillary electrophoresis, leading to safety concerns and increased costs, especially for field-deployable and portable applications.
Innovation Solution
The development of a vibrating sharp-edge spray ionization (VSSI) method that operates at zero voltage, allowing for direct sample ionization without extensive preparation and enabling coupling with mass spectrometers, liquid chromatography, and capillary electrophoresis systems without the need for specialized equipment or high concentrations of samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high voltage (2-5 kV) is used to induce electrospray, then ionization efficiency is improved, but safety concerns and external equipment demand increase
Solution Approach 1:
The patent replaces the electrical field-based electrospray ionization with a mechanical vibration-based system. A piezoelectric transducer vibrates a sharp-edge substrate at high frequency, mechanically generating aerosol droplets from the liquid sample. This mechanical approach eliminates the need for high voltage while maintaining ionization capability through direct contact of vibrating substrate with the liquid sample surface.
Solution Approach 2:
The patent fundamentally changes the operating parameter from high voltage (2-5 kV) to mechanical vibration frequency and amplitude. By controlling the piezoelectric transducer's vibration parameters, the system achieves effective sample aerosolization and ionization without requiring high voltage, thus resolving the safety concern while preserving ionization efficiency.
2Reliability
If high voltage (2-5 kV) is used to induce electrospray, then ionization efficiency is improved, but external equipment demand and cost increase
Solution Approach 1:
The patent replaces complex high voltage power supply systems and electrical field generation equipment with a simple piezoelectric transducer and vibration control system. The sharp-edge substrate mechanically generates aerosol droplets through vibration, eliminating the need for high voltage external equipment while maintaining ionization efficiency.
3Reliability
If ESI is used for mass spectrometry, then ionization capability is improved, but compatibility with capillary electrophoresis deteriorates due to voltage-driven conflicts
Solution Approach 1:
The patent replaces the voltage-driven electrospray ionization with a mechanically-driven vibration-based ionization system. Since the sharp-edge substrate uses mechanical vibration rather than electrical field to generate aerosol droplets, it does not conflict with the voltage-driven capillary electrophoresis separation process, enabling seamless coupling of both techniques.
4Measurement precision
If low flow rate is used in capillary electrophoresis, then separation precision is improved, but integration with electrospray ionization deteriorates
Solution Approach 1:
The patent replaces electrospray ionization with vibration-based ionization using a sharp-edge substrate. This mechanical approach does not require high flow rates to maintain spray stability, allowing effective coupling with capillary electrophoresis's low flow rate output while preserving separation precision.
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
VSSI provides a safe, cost-effective, and efficient ionization method that simplifies sample analysis, reduces equipment complexity, and enhances compatibility with various separation techniques, enabling field-deployable and portable mass spectrometry applications while maintaining high sensitivity and resolution.
Implementation Method 1
the vibration source is a piezoelectric transducer
Implementation Method 2
oscillate the sharp edge substrate at its resonant frequency
Implementation Method 3
aerosolize a liquid sample via direct contact between the vibrating sharp edge and the liquid sample
Data Source
AI summary
In accordance with the purpose(s) of the present disclosure, as embodied and broadly described herein, the disclosure, in one aspect, relates to a vibrating sharp edge spray ionization (VSSI) method suitable for coupling with a mass spectrometer, a VSSI method modified with a capillary suitable for use with continuous-flow separation methods such as liquid chromatography, and a VSSI method suitable for coupling with a capillary electrophoresis (CE) device in order to introduce the CE sample flow into a mass spectrometer. Also disclosed herein are devices for carrying out these methods and methods of making the same. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present disclosure.