Arrival time distributions in high-pressure mass spectrometry. IV. Origin of linear van't Hoff plots under nonequilibrium conditions in chemical ionization studies of reversible ionic reactions

1974 ◽  
Vol 96 (16) ◽  
pp. 5045-5050 ◽  
Author(s):  
G. G. Meisels ◽  
G. J. Sroka ◽  
R. K. Mitchum
Keyword(s):  
Mass Spectrometry ◽  
High Pressure ◽  
Chemical Ionization ◽  
Arrival Time ◽  
Nonequilibrium Conditions ◽  
Ionic Reactions

Thermal fragmentation analysis of neutral polysaccharides and the presence of 1,6-anhydrooligosaccharides

1990 ◽  
Vol 68 (7) ◽  
pp. 1038-1043 ◽  
Author(s):  
R. J. Helleur ◽  
P. Jackman
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
High Pressure ◽  
Liquid Chromatography ◽  
High Pressure Liquid Chromatography ◽  
Chemical Ionization ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Desorption Chemical Ionization

Small quantities of pyrolysates were obtained from micro-scale off-line pyrolysis of the neutral polysaccharides: cellulose, amylose, laminaran, nigeran, and a mannan from ivory nut. The pyrolytic fragments were analyzed by desorption chemical ionization – mass spectrometry, trimethylsilyl derivatization – capillary gas chromatography (– ammonia chemical ionization mass spectrometry) and benzoyl derivatization – high pressure liquid chromatography. Intact 1,6-anhydrohexosemonosaccharide, and -disaccharide fragments were identified as major products. By using off-line analytical pyrolysis information on saccharide composition can be obtained from the formation of anhydromonosaccharide products while linkage information is obtainable from distinctive anhydrodisaccharide products. Keywords: pyrolysis, polysaccharides, 1,6-anhydrooligosaccharides, desorption chemical ionization, mass spectrometry, gas chromatography, high pressure liquid chromatography.

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