2009
DOI: 10.1002/rcm.4040
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Positive mode electrospray tandem mass spectrometry of poly(methacrylic acid) oligomers

Abstract: The dissociation of small poly(methacrylic acid) (PMAA) cations produced by electrospray was characterized by tandem mass spectrometry. Similarly to PMAA ions produced in the negative ion mode, the two electrosprayed cationic forms, namely [PMAA+Na](+) and [PMAA-H+2Na](+), were shown to fragment via a major pathway consisting of successive dehydration steps. Elimination of a water molecule would occur between two consecutive acid groups in a charged-remote mechanism and was shown to proceed as many times as pa… Show more

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Cited by 23 publications
(22 citation statements)
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“…The homopolymer was detected with low intensity as [P n Ϫ H] Ϫ ions, with n the polymerization degree, but also as deprotonated molecules with some sodiated carboxylic acid groups, [P n ϩ xNa Ϫ (x ϩ 1)H] Ϫ ions (with x ranging from 1 to 3. Similar adducts were also formed from polymeric impurities, present in the studied standards, noted P= n and PЉ n in the inset of Figure 1a, consisting of a PMAA homopolymer with respectively one and two MMA unit, as evidenced in previous studies [29,30]. Mass spectra consisting of such multiple distributions, which have already been reported for poly(acrylic acid) or poly(styrene sulfonic acid) polymers [38], were obtained for all tested PMAA standards and a quite high laser fluence was usually required to generate the observed signals.…”
Section: Resultssupporting
confidence: 83%
“…The homopolymer was detected with low intensity as [P n Ϫ H] Ϫ ions, with n the polymerization degree, but also as deprotonated molecules with some sodiated carboxylic acid groups, [P n ϩ xNa Ϫ (x ϩ 1)H] Ϫ ions (with x ranging from 1 to 3. Similar adducts were also formed from polymeric impurities, present in the studied standards, noted P= n and PЉ n in the inset of Figure 1a, consisting of a PMAA homopolymer with respectively one and two MMA unit, as evidenced in previous studies [29,30]. Mass spectra consisting of such multiple distributions, which have already been reported for poly(acrylic acid) or poly(styrene sulfonic acid) polymers [38], were obtained for all tested PMAA standards and a quite high laser fluence was usually required to generate the observed signals.…”
Section: Resultssupporting
confidence: 83%
“…Alkali metal cationized poly(methacrylic acid) mainly fragments by sequential dehydrations (Giordanengo et al, 2009a). At low collision energies (up to $2 eV in the center-of-mass frame), the SCHEME 8. a: Charge-remote 1,5-H rearrangement in the t-butyl ester side chains of poly(t-butyl methacrylate) leading to the expulsion of isobutylene units.…”
Section: J Poly(methacrylic Acid) and Poly(acrylic Acid)mentioning
confidence: 99%
“…In some cases, however, MS/MS experiments do not allow end-group analysis because polymer ion dissociation mainly proceeds via reactions involving pendant groups, such as for sodiated poly(methacrylic acid) [2], deprotonated poly(methacrylic acid) [3], or protonated poly(methyl methacrylate) [4]. The choice of the cation to be adducted to polymer molecules was also shown to have a great impact in the production of informative fragment ions under CID conditions.…”
Section: Introductionmentioning
confidence: 99%