ESI-DMS-MS System Ion Mobility Control
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Solution Overview
Problem
Existing Differential Mobility Spectrometry (DMS) systems face challenges in understanding ion behavior during separation, particularly with cluster/dimer ions, leading to reduced detection accuracy and resolution, and competitive ion suppression in Electrospray Ionization (ESI) samples, which limits the analysis of complex samples.
Innovation Solution
The ESI-DMS-MS system employs enhanced predictive modeling and molecular interactions to compensate for competitive ion suppression and improve ion separation, using the Core and Façade mechanisms to alter analyte ion mobility based on gas phase interactions, including chemical structure, conformational freedom, and electrostatic attraction, to enhance detection and quantization accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DMS is used for ion separation in complex samples, then ion separation capability is improved, but competitive ion suppression occurs reducing detection accuracy
Solution Approach 1:
The patent segments the ion separation process into two distinct stages: first, DMS separates ions based on their mobility in an asymmetric electric field, and second, the mass spectrometer separates ions based on mass-to-charge ratio. This segmentation allows each technique to optimize for its specific function, with DMS handling mobility-based separation and MS handling mass-based separation, thereby reducing ion suppression effects while maintaining detection accuracy.
Solution Approach 2:
The patent adds a new dimension to ion separation by combining mobility-based separation (DMS) with mass-to-charge ratio-based separation (MS). This two-dimensional separation approach enables the system to resolve complex mixtures more effectively, as ions are separated along two independent parameters rather than one, significantly reducing competitive ion suppression and improving detection accuracy.
2Productivity
If conventional IMS is used for ion separation, then ion mobility separation is achieved, but separation efficiency is reduced for complex samples
Solution Approach 1:
The patent employs dynamic asymmetric electric field waveforms in the DMS device, where the electric field strength and polarity change continuously over time. This dynamic approach allows for more flexible and efficient ion separation compared to conventional IMS, enabling better resolution of complex samples while maintaining high separation efficiency through real-time adjustment of field parameters.
Solution Approach 2:
The patent changes key parameters of the electric field, using asymmetric waveforms with varying field strengths and durations, to optimize ion separation. By adjusting parameters such as field asymmetry ratio, frequency, and amplitude, the system achieves both high separation efficiency and excellent resolution for complex samples, overcoming the limitations of conventional IMS with constant electric fields.
3Ease of operation
If DMS with asymmetric electric field is used, then ion mobility control is improved, but understanding of ion behavior becomes more difficult
Solution Approach 1:
The patent incorporates feedback mechanisms where the DMS system continuously monitors ion transmission and adjusts the asymmetric electric field parameters in real-time to optimize separation. This feedback loop simplifies operation by automatically adapting to different sample types and ion behaviors, making the system easier to control while providing deeper insights into ion behavior through the feedback data.
Solution Approach 2:
The patent uses a composite analytical approach combining DMS technology with mass spectrometry detection. This composite system leverages the strengths of both techniques, where DMS provides mobility-based separation control and MS provides mass-based identification, together offering both ease of operation and comprehensive understanding of ion behavior that neither technique could achieve alone.
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 significantly improves the resolution and quantization of samples by accurately predicting and controlling ion mobility, reducing ion suppression effects and enhancing the detection of analytes, enabling faster and more precise analysis of complex samples.
Implementation Method 1
Differential Mobility Spectrometry (DMS), also referred to as High Field Asymmetric Waveform Ion Mobility Spectrometry (FAIMS) and Field Ion Spectrometry (FIS), are technologies for gas phase ion sample separation and analysis.
Implementation Method 2
The ion's mobility in this asymmetric electric field demonstrates a net movement towards the bottom electrode plate of the DMS filter 102.
Implementation Method 3
In one embodiment, the ESI-DMS-MS system includes a micromachined, nanomachined, and/or nanoESI-DMS-MS platform for rapid quantitative analysis.
Implementation Method 4
Researchers have interfaced DMS with mass spectrometry to take advantage of the atmospheric pressure, gas phase, and continuous ion separation capabilities of DMS and the detection specificity offered by mass spectrometry.
Implementation Method 5
This approach significantly improves the resolution and quantization of samples by accurately predicting and controlling ion mobility, reducing ion suppression effects and enhancing the detection of analytes.
Data Source
AI summary
The invention relates generally to systems, methods and devices for analyzing samples and, more particularly, to systems using a mass analyzer in combination with a differential mobility spectrometer to enhance the analysis process of constituents of a sample.