Collisionally Activated Dissociation of 13-Membered Peptides, Ustiloxins, and Phomopsins.

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  • Collisionally Activated Dissociation of

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Collisionally activated dissociation (CAD) of [M+H]+ of ustiloxins and phomopsins was examined. Fragments of ustiloxins were formed by the cleavage of O(1)-C(2) and the peptide chain to form “a”, “b”, “x”, and “y” series ions, and of the C(9)-C(10) bond to form ions “M-Bz” and “b-Bz”. Phomopsins gave the “b” and “y” series ions. The difference may be at least partly explained by different hydrogen bond-forming characteristics of ustiloxins and phomopsins.

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