Abstract

AbstractThe gas‐phase chemistry of anionic [M + Cat2+ – 3H]− complexes between Ca2+‐specific peptides and the alkaline earth metal ions Mg2+, Ca2+ and Ba2+ is reported. The metal ion complexes were studied using fast atom bombardment, collision‐induced decomposition (CID) and molecular mechanical calculations. The CID reactions and molecular mechanical calculations revealed that the Ca2+–peptide complexes are bound differently to the Mg2+– and Ba2+–peptide complexes and that the intrinsic (gas‐phase) chemistry is reflected by known aqueousphase chemistry.

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