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Developing Reduced Mass-Only Ion Mobility Separations to Unravel Mass Distribution-Based Isotopic Shifts
1Department of Chemistry, University of Utah, 315 South 1400 East, Room 2020, Salt Lake City, Utah 84112, United States.
Summary
Researchers developed a new method to separate isotopic shifts in ion mobility, distinguishing between reduced mass and mass distribution effects. This technique reveals mass distribution significantly impacts carbohydrate isotopologue separation.
Area of Science:
- Analytical Chemistry
- Physical Chemistry
- Separation Science
Background:
- High-resolution ion mobility separations can distinguish isotopologues and isotopomers (isotopic shifts) based on mass distribution changes.
- Existing methods cannot decouple the contributions of reduced mass and mass distribution to observed isotopic shifts.
- Accurate quantification of these contributions is crucial for understanding ion structure and improving separation accuracy.
Purpose of the Study:
- To develop a novel calibration strategy to isolate and quantify the absolute contributions of reduced mass and mass distribution to isotopic shifts.
- To apply this method to study isotopic shifts in isotopically permethylated carbohydrates.
Main Methods:
- Development of a calibration curve based solely on the reduced mass effect in ion mobility.
- Utilizing this calibration curve to deconvolve experimental isotopic shift data.
- Application to isotopically permethylated carbohydrates to determine the relative contributions of reduced mass and mass distribution.
Main Results:
- Successfully generated the first reduced mass-only ion mobility calibration curve.
- Demonstrated that mass distribution effects are significantly larger than reduced mass effects for isotopically permethylated carbohydrates.
- Quantified the absolute contributions of both factors to experimental isotopic shifts.
Conclusions:
- The developed reduced mass-only calibration methodology effectively decouples reduced mass and mass distribution contributions to isotopic shifts.
- This approach provides a significant advancement in understanding the factors governing ion mobility separations of isotopologues.
- The methodology is broadly applicable to various systems exhibiting measurable isotopic shifts, enhancing the study of ion structure.
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