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Titolo:
Determination of molecular mass distribution of silicone oils by supercritical fluid chromatography, matrix-assisted laser desorption ionization time-of-flight mass spectrometry and their off-line combination
Autore:
Chmelik, J; Planeta, J; Rehulka, P; Chmelik, J;
Indirizzi:
Acad Sci Czech Republ, Inst Analyt Chem, CS-61142 Brno, Czech Republic Acad Sci Czech Republ Brno Czech Republic CS-61142 Brno, Czech Republic Masaryk Univ, Lab Struct & Dynam Biomol, CS-61137 Brno, Czech Republic Masaryk Univ Brno Czech Republic CS-61137 CS-61137 Brno, Czech Republic
Titolo Testata:
JOURNAL OF MASS SPECTROMETRY
fascicolo: 7, volume: 36, anno: 2001,
pagine: 760 - 770
SICI:
1076-5174(200107)36:7<760:DOMMDO>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
GEL-PERMEATION CHROMATOGRAPHY; MALDI-TOF; SYNTHETIC-POLYMERS; POLYDISPERSITY; FRACTIONATION; PERFORMANCE;
Keywords:
silicone oils; determination; polymer size distribution; supercritical fluid chromatography; matrix-assisted laser desorption ionization-time-of-flight mass spectrometry;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Chmelik, J Acad Sci Czech Republ, Inst Analyt Chem, Veveri 97, CS-61142 Brno, Czech Republic Acad Sci Czech Republ Veveri 97 Brno Czech Republic CS-61142 c
Citazione:
J. Chmelik et al., "Determination of molecular mass distribution of silicone oils by supercritical fluid chromatography, matrix-assisted laser desorption ionization time-of-flight mass spectrometry and their off-line combination", J MASS SPEC, 36(7), 2001, pp. 760-770

Abstract

Silicone oil samples were characterized by supercritical fluid chromatography (SFC), matrix-assisted laser desorption ionization-time-of-flight mass spectrometry (MALDI-TOF MS), and their off-line combination. SFC was used to separate samples of silicone oils on micropacked capillary columns. The fractions for the identification studies were obtained from SFC runs at defined time intervals, when the restrictor was pulled out from the chromatographic flame ionization detector (FID) and inserted into a,glass vial with acetone. MALDI-TOF MS was used for the identification of individual oligomersin the fractions separated. The molecular mass distributions determined based on SFC and MALDI-TOF MS measurements were compared. From this comparison, it follows that the results are in good agreement. However, certain differences were observed: MALDI-TOF MS was capable of detecting somewhat larger oligomers than the SFC-FID, but the lower molecular mass oligomers were not present in the MALDI spectra. Differences in the region of lower molecular masses can be explained by evaporation of the more volatile low molecular mass oligomers resulting from heating of the sample during the MALDI-TOF MS measurements as a result of the absorption of the laser shot energy. Thefact that no high mass discrimination effects of the MALDI-TOF MS measurements, compared with SFC, were observed is very promising for further applications of MALDI-TOF MS in characterizing synthetic polymers of moderate polydispersity. Copyright (C) 2001 John Wiley & Sons, Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 18:16:25