Quantitative analysis of exogenous peptides in plasma using immobilized enzyme cleavage and gas chromatography-mass spectrometry with negative ion chemical ionization

1997 ◽  
Vol 700 (1-2) ◽  
pp. 9-21 ◽  
Author(s):  
Cristina D. Márquez ◽  
Mu-Lan Lee ◽  
Susan T. Weintraub ◽  
Philip C. Smith
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Quantitative Analysis ◽  
Chemical Ionization ◽  
Immobilized Enzyme ◽  
Negative Ion ◽  
Gas Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry ◽  
Negative Ion Chemical Ionization ◽  
Enzyme Cleavage

Irace Level Detection of Chlorinated Paraffins in Biological and Environmental Samples, Using Gas Chromatography/Mass Spectrometry with Negative-Ion Chemical Ionization

1985 ◽  
Vol 68 (3) ◽  
pp. 427-430
Author(s):  
Peter P Schmid ◽  
Markus D Muller
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Environmental Samples ◽  
Chemical Ionization ◽  
Negative Ion ◽  
Gas Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry ◽  
Biological And Environmental Samples ◽  
Chlorinated Paraffins ◽  
Negative Ion Chemical Ionization

Abstract A method is described for detection of chlorinated paraffins (CPs) in biological and environmental samples. Sample preparation includes sulfuric acid treatment followed by adsorption chromatography on ilumina, which yields the CPs in one fraction that is almost free of interfering material. Using gas chromatography/mass spectrometry j with negative-ion chemical ionization, the limit of detection is 5 ng (corresponding to the lower ppb range). CP levels of 30 ppm, 200 ppb, ' and 5 ppb were found in sewage sludge, human fat, and sediment, respectively.

scholarly journals Rapid Determination of Imazapyr in Corn by Gas Chromatography/Mass Spectrometry with Electron Capture Negative Ion Chemical Ionization

1996 ◽  
Vol 79 (5) ◽  
pp. 1220-1226 ◽  
Author(s):  
Steven J Stout ◽  
Adrian R Dacunha ◽  
J Shahn Fletcher ◽  
Gerald L Picard
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Electron Capture ◽  
Chemical Ionization ◽  
Rapid Determination ◽  
Negative Ion ◽  
Gas Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry ◽  
Negative Ion Chemical Ionization ◽  
Cleanup Procedure

Abstract Imazapyr, an imidazolinone class herbicide, was developed recently for weed control in imidazolinonetolerant corn. Current methods for determining imidazolinone herbicides in crops involve laborious, time-consuming cleanup procedures after extraction. We developed an extremely simple cleanup procedure for imazapyr in corn commodities after extraction with acidic acetone-water by using gas chromatography/mass spectrometry with electron capture negative ion chemical ionization for final detection. Method sensitivity was 50 ppb, with controls showing <5 ppb. Average recoveries from corn forage, fodder, and grain were 98,106, and 101%, respectively.

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