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제안 방법
- , in G0-2. Based upon this, the proton distribution in the reduced 3+ ions is investigated using a newly devised methodology employing both SORI-CAD and ECD methods, exhibiting almost identical proton distribution to that for the native 4+ ions. This observation suggests that the protons in the polymer ions with a size of ~1.
- 4 represent the multiply protonated molecules of the dendrimer, each of which carries 4+, 3+, and 2+ ions, respectively, whereas the low abundant peaks are synthetic failures or the ions fragmented presumably in the nozzle-skimmer region. Changes in the composition of ESI solution resulted in variation of the relative abundances for the precursor ions, but did not produce 1+ or 5+ ions that were abundant enough to allow for further tandem mass spectrometry analysis. Thus, in the following experiments, only 2+ 4+ ions, (M+nH)n+ [n = 2-4], are chosen for further characterization of the proton distribution and electron capture efficiencies of the protons.
- 3+ Ions Reduced from Electron Capture by 4+ Ions. For the investigation of the electron capture efficiencies of the protons belonging to the three different generations in the 4+ dendrimer ion, Gx (x = 0, 1, or 2), a new strategy is devised, which involves the comparison between the native 2+ −4+ ions and the reduced 3+ ions (from electron capture) in their SORI-CAD fragmentation behaviors, i.e., their proton distribution among the three generations. This strategy utilizes the fact that the 3+ ions derived from charge-reduction (i.
- Each experiment was repeated for at least three times in order to get meaningful statistics. The resulting MS/MS spectra were zero-filled once and then subjected to one Hanning apodization procedure, and subsequently analyzed manually without any aid of retrieving/interpreting software due to the unconventional character of the sample molecules. The sample was used as provided from a commercial vendor, without further purification.
대상 데이터
- Experiments were performed on a commercial 4.7 Tesla Fourier transform mass spectrometer (FTMS: Ionspec, Lake Forest, CA, USA) equipped with a modified nano-electrospray source. Detailed description of the experimental setup can also be found elsewhere.
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