A lipidomic workflow capable of resolving sn - and C[double bond, length as m-dash]C location isomers of phosphatidylcholines

Chemical Science
Xue ZhaoYu Xia

Abstract

As a major class of mammalian lipids, phosphatidylcholines (PCs) often contain mixtures of structural isomers, resulting from different lipogenesis pathways. Profiling PCs at the isomer level, however, remains challenging in lipidomic settings, especially for characterizing the positions of fatty acyls on the glycerol backbone (sn-positions) and the locations of carbon-carbon double bonds (C[double bond, length as m-dash]Cs) in unsaturated acyl chains. In this work, we have developed a workflow for profiling PCs down to sn- and C[double bond, length as m-dash]C locations at high coverage and sensitivity. This capability is enabled by radical-directed fragmentation, forming sn-1 specific fragment ions upon collision-induced dissociation (CID) of bicarbonate anion adducts of PCs ([M + HCO3]-) inside a mass spectrometer. This new tandem mass spectrometry (MS/MS) method can be simply incorporated into liquid chromatography by employing ammonium bicarbonate in the mobile phase without any instrument modification needed. It is also compatible with the online Paternò-Büchì reaction and subsequent MS/MS for the assignment of C[double bond, length as m-dash]C locations in sn-1 fatty acyl chains of unsaturated PCs. The analytical perform...Continue Reading

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Citations

Apr 30, 2020·Analytical and Bioanalytical Chemistry·Mengmeng XuPim Leonards
Jan 19, 2020·Nature Communications·Wenbo CaoXiaoxiao Ma
May 19, 2021·Nature Communications·Zishuai LiZheng Ouyang

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