Fast atom bombardment--tandem mass spectrometry studies of organo-alkali metal ions of small peptides.
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abstract
Tandem mass spectrometry (TMS) combined with fast-atom bombardment (FAB) ionization is potentially useful for the structural characterization of blomolecules. The advantages of the FAB-TMS experiment have been discussed in previous works, with the major advantages usually relating to mixture analysis. In this work, FAB-TMS is used to study the dissociation reactions of the [M + H]+ and [M + Na]+ ions of a small peptide, i.e., hippuryl-L-histidyl-L-leucine. This work shows that additional information can be gained by comparing the dissociation reactions of these two different ionic forms. Owing to the specific binding of Na+ in the organo-alkail metal ion, the collision-induced dissociation spectrum of the [M + Na]+ ion of hippuryi-L-histidyl-L-leucine shows characteristic dissociation reactions not observed for the [M + H]+ ion. 1986, American Chemical Society. All rights reserved.