Ion Mobility Dimer Analysis for Enantiomeric Purity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing ion mobility spectrometry (IMS) devices cannot effectively separate enantiomers due to their identical collisional cross-sections, requiring a chiral modifier that is not currently available in commercial systems, limiting quick and easy enantiomeric purity determination.
Innovation Solution
The method involves ionizing the analyte to form dimer ions, separating these dimers by ion mobility, and detecting distinct ion mobility peaks for homodimers and heterodimers to determine enantiomeric purity without the need for chiral selectors or complexing agents, leveraging the self-dimerization of chiral molecules to achieve diastereomeric differentiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If ion mobility separation is used to separate enantiomers, then separation speed is improved, but separation effectiveness deteriorates because enantiomers have identical collisional cross-sections
Solution Approach 1:
The invention changes the physical-chemical parameters of the analyte by converting enantiomers into diastereomeric dimers through self-dimerization. This parameter change transforms the separation challenge from separating identical collisional cross-sections to separating diastereomers with different collisional cross-sections, enabling effective ion mobility separation while maintaining speed.
Solution Approach 2:
The invention introduces a self-dimerization process as an intermediary step that converts enantiomers into diastereomeric dimers. This intermediary transformation creates species with different collisional cross-sections that can be separated by ion mobility, effectively mediating between the speed advantage of IMS and the need for accurate enantiomeric differentiation.
2Measurement precision
If chiral modifiers are added to enable enantiomer separation, then enantiomeric differentiation is improved, but device complexity increases due to additional reagents and preparation steps
Solution Approach 1:
The invention applies self-service by utilizing the analyte's own ability to self-dimerize. The chiral molecules automatically form diastereomeric dimers without requiring external chiral modifiers, reagents, or complex preparation steps. This self-service approach achieves enantiomeric differentiation while keeping the system simple and compatible with commercial IMS instruments.
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
Enables facile determination of enantiomeric purity and excess through ion mobility spectrometry by detecting distinct peaks for homodimers and heterodimers, eliminating the need for additional chiral modifiers and providing accurate enantiomeric ratios.
Implementation Method 1
separating ions of different dimers of the analyte by ion mobility
Implementation Method 2
The dimerization can give different diastereomers, which have different collisional cross-sections and hence different ion mobilities
Data Source
AI summary
A method of determining the enantiomeric purity of an analyte, comprising: ionising the analyte to form dimer ions; separating ions of different dimers of the analyte by ion mobility; detecting a first ion mobility peak corresponding to ions of one or more first dimers and detecting a second ion mobility peak corresponding to ions of one or more second dimers; and determining the enantiomeric purity of said analyte from the ratio of the peak area of the first ion mobility peak to the peak area of the second ion mobility peak.