![]() ![]() ![]() Isobaric fragmentation products from protonated Met and Trp were resolved and identified for the first time. In the present study, we examined the fragmentation patterns of 19 AAs using high-resolution electrospray ionization MS/MS (HR-ESI-MS/MS) with collision-induced dissociation (CID). Isobaric fragmentation products and minor fragmentation products could have been overlooked or misannotated. Fragmentation reactions of protonated α-amino acids (AAs) were studied previously using tandem mass spectrometry (MS/MS) of unit mass resolution. ![]()
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