|
Eur. J. Mass Spectrom. 9, (2003) |
|
Analysis of polypropyleneglycols using electrospray ionization mass spectrometry. Effects of cationizing agents on the mass spectra | ||
Shoji Okuno* |
||
ABSTRACT: | ||
In electrospray ionization mass spectrometry (ESI-MS) of polypropyleneglycol (PPG), effects of cationizing agents were examined. When NaI was used as a cationizing agent, the distribution of multiply charged ions in the spectra was greatly affected by relative ratios between the cationizing agent and PPG. However, it was not affected by the use of CH3COONH4. With increasing of cone voltage, fragmentation occurred by in-source collision-induced dissociation (CID) when CH3COONH4 was used. On the contrary, no decomposition of the PPG backbone was observed in the case of NaI. Instead, intensity of the smaller charged ions, whose mass-to-charge ratios (m/z) are larger, increased because of the elimination of Na+ with increasing of cone voltage. Under an optimum condition for the ESI-MS analysis, PPGs that have different molecular weights, different initiators or end groups were able to be characterized easily and accurately. The MS/MS study of NH4+ adduct ions of PPG indicates that vinyl-terminated linear structure is formed at the end group during the fragmentation | ||
Keywords: polypropyleneglycol, electrospray ionization mass spectrometry, cationizing agent, cone voltage, ion-trap, MS/MS |
You can now buy this paper on-line in PDF format; it costs only £11.75. Just click on the BUY on-line button. You can pay on-line through a secure server and get access immediately.
© IM Publications Any problems? E-mail . |
![]() |