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• W4366199512 abstract "Isomeric molecules are important analytes in many biological and chemical arenas, yet their similarity poses challenges for many analytical methods, including mass spectrometry (MS). Tandem-MS provides significantly more information about isomers than intact mass analysis, but highly similar fragmentation patterns are common and include cases where no unique m/z peaks are generated between isomeric pairs. However, even in such situations, differences in peak intensity can exist and potentially contain additional information. Herein, we present a framework for comparing mass spectra that differ only in terms of peak intensity and include calculation of a statistical probability that the spectra derive from different analytes. This framework allows for confident identification of peptide isomers by collision-induced dissociation, higher-energy collisional dissociation, electron-transfer dissociation, and radical-directed dissociation. The method successfully identified many types of isomers including various d/l amino acid substitutions, Leu/Ile, and Asp/IsoAsp. The method can accommodate a wide range of changes in instrumental settings including source voltages, isolation widths, and resolution without influencing the analysis. It is shown that quantification of the composition of isomeric mixtures can be enabled with calibration curves, which were found to be highly linear and reproducible. The analysis can be implemented with data collected by either direct infusion or liquid-chromatography MS. Although this framework is presented in the context of isomer characterization, it should also prove useful in many other contexts where similar mass spectra are generated." @default.
• W4366199512 created "2023-04-19" @default.
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• W4366199512 date "2023-04-17" @default.
• W4366199512 modified "2023-10-01" @default.
• W4366199512 title "Statistical Framework for Identifying Differences in Similar Mass Spectra: Expanding Possibilities for Isomer Identification" @default.
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• W4366199512 doi "https://doi.org/10.1021/acs.analchem.3c00495" @default.
• W4366199512 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37128750" @default.
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