Ion Mobility Screening for Compound Detection Accuracy
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Solution Overview
Problem
Conventional mass spectrometry screening methods face challenges in accurately detecting compounds of interest due to high rates of false positives and false negatives, as they require a compromise in tolerance window settings for ion mobility and other physicochemical properties, which can lead to missed detections or incorrect identifications.
Innovation Solution
The method involves using ion mobility as a highly reproducible property to set a narrow tolerance window for ion mobility, allowing a wider tolerance window for other properties, thereby reducing false positives and negatives by comparing experimentally measured ion mobilities and other properties of candidate ions against those of the compound of interest.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tolerance window is set relatively wide to avoid excluding candidate ions, then the likelihood of detecting false positives increases
Solution Approach 1:
The patent introduces ion mobility as an additional dimension for comparing candidate ions against compounds of interest. By adding this fourth parameter (ion mobility) to the traditional three (retention time, mass, fragment ion mass), the method can set narrower tolerance windows in each dimension while maintaining overall detection reliability, thereby reducing false positives without missing true positives.
Solution Approach 2:
The patent changes the parameter set used for compound identification by incorporating ion mobility measurements. This additional parameter allows for more precise matching and enables the use of narrower tolerance windows for each parameter, improving the ability to distinguish true positives from false positives while maintaining high detection accuracy.
2Object-generated harmful factors
If the tolerance window is set relatively narrow to avoid false positives, then the likelihood of false negatives increases
Solution Approach 1:
By adding ion mobility as an additional comparison dimension, the patent enables the use of narrower tolerance windows in each parameter space. The increased dimensionality provides more discriminatory power, allowing narrow windows that reduce false positives while still capturing true positives through the combined multi-parameter matching approach.
Solution Approach 2:
The patent creates a composite identification approach by combining multiple parameters (retention time, mass, fragment ion mass, and ion mobility) into a unified matching system. This composite method allows each individual parameter to have a narrow tolerance window, and the combination provides robust detection that reduces both false positives and false negatives.
3Ease of operation
If conventional screening methods use a compromise tolerance window setting, then both false positives and false negatives increase
Solution Approach 1:
The patent adds ion mobility as an additional dimension to the screening process, which enables the use of narrower, more precise tolerance windows without requiring compromise settings. This additional parameter provides better discrimination power, allowing the method to maintain screening simplicity while significantly reducing both false positives and false negatives.
Solution Approach 2:
The patent replaces the conventional single-parameter or limited-parameter matching approach with a multi-parameter system that includes ion mobility measurements. This substitution transforms the screening mechanism from relying on compromise tolerance settings to using precise multi-dimensional matching, thereby reducing false results while maintaining operational simplicity.
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 enhances the efficiency of compound detection by reducing false positives and negatives, ensuring more accurate identification and quantification of compounds of interest in samples, particularly when combined with ion mobility separation and mass analysis.
Implementation Method 1
experimentally measuring the ion mobilities of the candidate ions using an ion mobility separator so as to obtain an experimental value corresponding to the ion mobility of each of the candidate ions
Implementation Method 2
ionising the sample to produce candidate ions
Data Source
AI summary
A method of screening a sample for at least one compound of interest is disclosed. The method comprises comparing the ion mobility and at least one further physicochemical property of the ions of a compound of interest to the same properties of candidate ions in the sample. The properties of the compound of interest are matched to those of a candidate ion in the sample then the sample may be determined to comprise the compound of interest.