Gas Chromatography Chemical Ionization Mass Spectrometry and Tandem Mass Spectrometry for Identification and Straightforward Quantification of Branched Chain Fatty Acids in Foods

2020 ◽  
Vol 68 (17) ◽  
pp. 4973-4980 ◽  
Author(s):  
Dong Hao Wang ◽  
Zhen Wang ◽  
J. Thomas Brenna
Keyword(s):  
Mass Spectrometry ◽  
Fatty Acids ◽  
Gas Chromatography ◽  
Tandem Mass Spectrometry ◽  
Chemical Ionization ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Tandem Mass ◽  
Branched Chain Fatty Acids ◽  
Branched Chain

scholarly journals Quantification of hydroxyacetone and glycolaldehyde using chemical ionization mass spectrometry

2011 ◽  
Vol 11 (8) ◽  
pp. 23619-23653 ◽  
Author(s):  
K. M. Spencer ◽  
M. R. Beaver ◽  
J. M. St. Clair ◽  
J. D. Crounse ◽  
F. Paulot ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Chemical Ionization ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Tandem Mass ◽  
Direct Separation ◽  
In Situ Detection

Abstract. Chemical ionization mass spectrometry (CIMS) enables online, fast, in situ detection and quantification of hydroxyacetone and glycolaldehyde. Two different CIMS approaches are demonstrated employing the strengths of single quadrupole mass spectrometry and triple quadrupole (tandem) mass spectrometry. Both methods are capable of the measurement of hydroxyacetone, an analyte with minimal isobaric interferences. Tandem mass spectrometry provides direct separation of the isobaric compounds glycolaldehyde and acetic acid using distinct, collision-induced dissociation daughter ions. Measurement of hydroxyacetone and glycolaldehyde by these methods was demonstrated during the ARCTAS-CARB 2008 campaign and the BEARPEX 2009 campaign. Enhancement ratios of these compounds in ambient biomass burning plumes are reported for the ARCTAS-CARB campaign. BEARPEX observations are compared to simple photochemical box model predictions of biogenic volatile organic compound oxidation at the site.

Optimization of pyrolysis–desorption chemical ionization mass spectrometry and tandem mass spectrometry of polysaccharides

1994 ◽  
Vol 72 (2) ◽  
pp. 345-351 ◽  
Author(s):  
R.J. Helleur ◽  
Pierre Thibault
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Chemical Ionization ◽  
Operating Conditions ◽  
High Mass ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Tandem Mass ◽  
Mass Fragment ◽  
Fragment Ions

The operating conditions for pyrolysis–desorption ammonia chemical ionization mass spectrometry and tandem mass spectrometry have been optimized and the technique evaluated for the production and analysis of structurally-informative pyrolytic fragmentation ions corresponding to intact anhydrohexose oligosaccharides, using amylose as the model polysaccharide. Among the various parameters examined it was found that the nature of the solvent used to adhere the sample to the emitter coil and the configuration of the emitter and the rate at which it is heated all play important roles in determining the efficiency of the pyrolytic process and the production of high mass fragment ions. Adjustment of reagent gas pressure together with source temperature also influence the chemical integrity of high mass oligomeric pyrolysis products. Under optimal operating conditions using ammonia reagent gas, the analyses of cellulose, laminarin, agars, and chitin gave relatively abundant ions corresponding to ammonium (or protonated) adducts of up to anhydrohexose tetrasaccharide. More importantly, the generation of such higher mass fragment ions provided a sustained ionic current of sufficient duration to perform tandem mass spectrometric analyses.

scholarly journals Quantification of hydroxyacetone and glycolaldehyde using chemical ionization mass spectrometry

2014 ◽  
Vol 14 (8) ◽  
pp. 4251-4262 ◽  
Author(s):  
J. M. St. Clair ◽  
K. M. Spencer ◽  
M. R. Beaver ◽  
J. D. Crounse ◽  
F. Paulot ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Chemical Ionization ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Tandem Mass ◽  
Triple Quadrupole ◽  
Direct Separation ◽  
In Situ Detection

Chemical ionization mass spectrometry (CIMS) enables online, rapid, in situ detection and quantification of hydroxyacetone and glycolaldehyde. Two different CIMS approaches are demonstrated employing the strengths of single quadrupole mass spectrometry and triple quadrupole (tandem) mass spectrometry. Both methods are generally capable of the measurement of hydroxyacetone, an analyte with known but minimal isobaric interferences. Tandem mass spectrometry provides direct separation of the isobaric compounds glycolaldehyde and acetic acid using distinct, collision-induced dissociation daughter ions. The single quadrupole CIMS measurement of glycolaldehyde was demonstrated during the ARCTAS-CARB (Arctic Research of the Composition of the Troposphere from Aircraft and Satellites - California Air Resources Board) 2008 campaign, while triple quadrupole CIMS measurements of glycolaldehyde and hydroxyacetone were demonstrated during the BEARPEX (Biosphere Effects on Aerosols and Photochemistry Experiment) 2009 campaign. Enhancement ratios of glycolaldehyde in ambient biomass-burning plumes are reported for the ARCTAS-CARB campaign. BEARPEX observations are compared to simple photochemical box model predictions of biogenic volatile organic compound oxidation at the site.

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