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Updated: Jul 16, 2026

Characterization of Synthetic Polymers via Matrix Assisted Laser Desorption Ionization Time of Flight (MALDI-TOF) Mass Spectrometry
Published on: June 10, 2018
Functional group selective ion/molecule reactions: mass spectrometric identification of the amido functionality in
Karinna M Campbell1, Michael A Watkins, Sen Li
1Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, USA.
Abstract:
A mass spectrometric method was developed for the screening of the amido functionality in monofunctional protonated analytes. This method is based on selective gas-phase derivatization of protonated analytes by (N,N-diethylamino)dimethylborane in a Fourier transform ion cyclotron resonance (FT-ICR) and triple quadrupole mass spectrometer. Examination of a series of protonated analytes demonstrated that only the compounds containing the amido functionality react with the aminoborane by the derivatization reaction. The mechanism involves proton transfer from the protonated analyte to the borane, followed by addition of the amide to the boron center, which leads to the elimination of neutral diethylamine. The derivatized analytes are readily identified on the basis of a shift of 40 m/z units relative to the m/z value of the protonated analyte and characteristic boron isotope patterns. Collision-activated dissociation was used to provide support for the structures assigned to the derivatized analytes. The structural information gained from this gas-phase derivatization method will aid in the functional group identification of unknown compounds and their mixtures.
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