Experimental Measurements of Relative Mobility Shifts Resulting from Isotopic Substitutions with High-Resolution Cyclic Ion Mobility Separations.
Anal Chem
; 94(6): 2988-2995, 2022 02 15.
Article
in En
| MEDLINE
| ID: mdl-35107996
ABSTRACT
Herein, we report on the experimental measurements for estimated relative mobility shifts caused by changes in mass distribution from isotopic substitutions in isotopologues and isotopomers with high-resolution cyclic ion mobility separations. By utilizing unlabeled and fully labeled isotopologues with the same isotopic substitutions (i.e., 2H or 13C), we created a highly precise mobility scale for each set analyzed to determine the magnitude of such mass distribution shifts and thus calculate estimated deviations from expected, theoretical reduced mass contributions. We observed relative mobility shifts in various isotopologues (e.g., hexadecyltrimethylammonium, sucrose, and palmitic acid species) that deviated from reduced mass theory, according to the Mason-Schamp relationship, ranging in estimated magnitude from â¼0.007% up to â¼0.1% in relative mobility. More interestingly, it was found that two deuterated palmitic acid isotopomers also differed by â¼0.03% from one another in their respective relative mobility shifts. Our results are the first report of isotopologue and isotopomer separations on a commercially available cyclic ion mobility spectrometry-mass spectrometry platform. We envision that our presented mobility scale methodology will have broad applicability in studying the effect of mass distribution changes from isotopic substitutions in other biomolecules and help pave the way for the improvement of ion mobility theory and collision cross section calculators.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Ion Mobility Spectrometry
Language:
En
Journal:
Anal Chem
Year:
2022
Document type:
Article
Affiliation country:
United States