scholarly journals Coupling Filter-Based Thermal Desorption Chemical Ionization Mass Spectrometry with Liquid Chromatography/Electrospray Ionization Mass Spectrometry for Molecular Analysis of Secondary Organic Aerosol

2020 ◽  
Vol 54 (20) ◽  
pp. 13238-13248
Author(s):  
Yuanlong Huang ◽  
Christopher M. Kenseth ◽  
Nathan F. Dalleska ◽  
John H. Seinfeld
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Electrospray Ionization ◽  
Thermal Desorption ◽  
Chemical Ionization ◽  
Organic Aerosol ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Desorption Chemical Ionization

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.

Separation and Analysis of the Pyrethrins by Combined Gas-Liquid Chromatography-Chemical Ionization Mass Spectrometry

1977 ◽  
Vol 60 (3) ◽  
pp. 685-689 ◽  
Author(s):  
Roy L Holmstead ◽  
David M Soderlund
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Chemical Ionization ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Gas Liquid Chromatography ◽  
Ionization Mass ◽  
Total Extract ◽  
Naturally Occurring ◽  
Selective Ion Monitoring

Abstract Pyrethrins, the 6 naturally occurring insecticidal esters of pyrethrum extract, were analyzed by combined gas-liquid chromatography-chemical ionization mass spectrometry. Separation was best on an OV-25 column with temperature programming. The chemical ionization mass spectra for the 6 esters as well as for the thermally isomerized pyrethrins I and II are reported and discussed. Using selective ion monitoring, a lower limit of detectability of all 6 esters was 114 ng of total extract injected on the column.

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