Successful MALDI-MS analysis of synthetic polymers with labile end-groups: the case of nitroxide-mediated polymerization using the MAMA-SG1 alkoxyamine

Chemistry : a European Journal
Caroline BarrèreLaurence Charles

Abstract

A sample pretreatment was evaluated to enable the production of intact cationic species of synthetic polymers holding a labile end-group using matrix-assisted laser desorption/ionization (MALDI) mass spectrometry. More specifically, polymers obtained by nitroxide-mediated polymerization involving the MAMA-SG1 alkoxyamine were stirred for a few hours in trifluoroacetic acid (TFA) to induce the substitution of a tert-butyl group on the nitrogen of nitroxide end-group by a hydrogen atom. Nuclear magnetic resonance, electrospray ionization tandem mass spectrometry, and theoretical calculations were combined to scrutinize this sample pretreatment from both mechanistic and energetic points of view. The substitution reaction was found to increase the dissociation energy of the fragile C-ON bond to a sufficient extent to prevent this bond to be spontaneously cleaved during MALDI analysis. This TFA treatment is shown to be very efficient regardless of the nature of the polymer, as evidenced by reliable MALDI mass spectrometric data obtained for poly(ethylene oxide), polystyrene and poly(butylacrylate).

References


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Citations

Jun 5, 2013·Analytical and Bioanalytical Chemistry·Alison R ManiegoPatrice Castignolles
Feb 6, 2014·Journal of the American Society for Mass Spectrometry·Syed Ghulam Musharraf Atta-ur-Rahman
Nov 29, 2013·Mass Spectrometry Reviews·Laurence Charles
Jan 31, 2014·Chemical Communications : Chem Comm·Thomas TrimailleKamel Mabrouk
Nov 27, 2020·Analytical Methods : Advancing Methods and Applications·Hee-Jin YooKun Cho

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