Ion Mobility Spectrometer Shifting Reagent Drift Time Separation
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Solution Overview
Problem
Ion mobility spectrometers face challenges in resolving interfering chemical and biological molecules due to limited resolution, which leads to false positives and difficulties in detecting low levels of targeted molecules, especially as molecular complexity increases, as they rely primarily on ion mobility without effectively utilizing molecular geometry for differentiation.
Innovation Solution
The use of shifting reagents that selectively interact with targeted functional groups of molecules, altering their drift times and ion mobility characteristics, allowing for structure-selective based separation and reducing interference by adding energy to the sample components, thereby enhancing resolution beyond traditional ion mobility differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional ion mobility separation is used, then device complexity is reduced, but the ability to differentiate molecules with similar ion mobilities deteriorates
Solution Approach 1:
The patent adds a spatial dimension (drift tube length) to the separation process. By extending separation in the drift direction rather than increasing mobility tube complexity, the system achieves better differentiation with minimal additional structural complexity.
Solution Approach 2:
The patent utilizes changes in drift time as a separability parameter. By measuring and comparing drift times of ions through the drift tube, the system differentiates molecules with similar ion mobilities without requiring complex structural modifications to the spectrometer.
2Adaptability or versatility
If molecules with high molecular complexity are analyzed, then the range of detectable analytes is expanded, but the number of possible conformations increases making separation more difficult
Solution Approach 1:
The patent uses the drift tube to provide an additional separation dimension that handles conformational complexity. While the mobility tube separates based on ion mobility, the drift tube further separates conformers based on their drift characteristics, enabling analysis of complex molecules with multiple conformations.
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 separation and identification of chemical and biological molecules by shifting their drift times, reducing interference and enhancing detection sensitivity, allowing for more accurate analysis of complex samples.
Implementation Method 1
shifting reagents that selectively interact with targeted functional groups of molecules, altering their drift times and ion mobility characteristics
Implementation Method 2
adding energy to the sample components, thereby enhancing resolution beyond traditional ion mobility differences
Data Source
AI summary
The present invention involves a series of shifting reagents that selectively interact with a targeted functional group of biological molecules, pharmaceutical drugs, small molecules, chemicals, chemical agents, or explosives resulting in a structure selective based drift time shift in the IMS. Additional energy is used to enhance the mobility based separation; in particular, the energy level can be tuned.