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Volumn 15, Issue 3, 2009, Pages 431-437

Letter metastable processes investigated on an orthogonal-axis time-of-flight instrument: Mass-scale calibration and application

Author keywords

Cid; End group specific dissociation; Metastable ions; Nanotechnology; Pla im publications llp 2009 all rights reserved; Polymers; Tof analyzer

Indexed keywords

ION; ORGANOSILICON DERIVATIVE; POLYESTER; POLYHEDRALOLIGOSILSESQUIOXANE; POLYLACTIDE; SODIUM;

EID: 66849131097     PISSN: 14690667     EISSN: None     Source Type: Journal    
DOI: 10.1255/ejms.973     Document Type: Article
Times cited : (5)

References (18)
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    • -1. Typical ESI conditions were: capillary voltage, 3.1 kV; cone voltage, 15V; source temperature, 80°C; desolvation temperature, 120°C. Dry nitrogen was used as the ESI gas. For the recording of the single-stage ESI-MS spectra, the quadrupole (rf-only mode) was set to pass ions from 50Th to 1000Th, and all ions were transmitted into the pusher region of the time-of-flight analyzer where they were mass analyzed with 1 s integration time. Data were acquired in continuum mode until acceptable averaged data were obtained. For the ESI-MS/MS CID experiments, the ions of interest are mass-selected by the quadrupole mass filter. The precursor ion resolution is adjusted to select only the monoisotopic signal amongst the complete isotopic cluster. The selected ions are then submitted to collision against argon in the rf-only hexapole collision cell. All ions coming out of the hexapole cell, either the fragments or the non dissociated precursor ions, are finally mass-measured with the oa-ToF analyzer.
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    • In a glovebox, 0.06 g (nNH2=2.510-4 mol) of hexadecylamine and 0.36g (nl-A=2.510-3 mol) of dried L-lactide were introduced by the glove box in a previousely flamed and nitrogen purged two-neck flask equipped with a three-way stopcock and a magnetic stirring bar. Outside of the box, the L-lactide/hexadecylamine mixture was charged successively by toluene (4mL) and tin (II) octoate (Sn (Oct) 2; 1 mL of a 0.1 M toluene solution) under nitrogen by using previously flame-dried syringes. The mixture was then heated at 75°C under stirring. After 20 h, the polymerization was stopped by adding a few drops of diluted hydrochloric acid (1 M, The obtained polymer was then precipitated out from cold heptane, filtered and dried under vacuum at 40°C. 1H-NMR (300MHz, CDCl3, δ (ppm, 0.8-1 (t, 3H, 1.3 (s, 28H, 1.5-1.9 (d, 3 (2n, 1) H, 3.8 (m, 2H, 4.4 (q, 1H; CH-OH, 5-5.3 (q, 2nH, 6.2 1H; NH
    • 3, δ (ppm)): 0.8-1 (t, 3H), 1.3 (s, 28H), 1.5-1.9 (d, 3 (2n + 1) H), 3.8 (m, 2H), 4.4 (q, 1H; CH-OH), 5-5.3 (q, 2nH), 6.2 (1H; NH).
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    • Structural analysis of poly ((R, S)-3- hydroxybutyrate-co-L-lactide) copolyesters by electrospray ionization ion trap mass spectrometry
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    • Adamus, G.1


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.