Gas Chromatographic Determination of the Plant Growth Regulator Flurprimidol in Soil and Soil-Grass Samples

1986 ◽  
Vol 69 (4) ◽  
pp. 572-575
Author(s):  
Sheldon D West ◽  
Bonnie S Rutherford
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Detection Limit ◽  
Plant Growth ◽  
Plant Growth Regulator ◽  
Chromatographic Determination ◽  
Gas Chromatography Mass Spectrometry ◽  
Electron Capture Detection ◽  
Control Samples

Abstract A method is described for the determination of flurprimidol residues in soil and soil-grass samples. Flurprimidol is extracted from the sample by refluxing with methanol-water. An aliquot is partitioned into hexane and purified by alumina B Sep-Pak column chromatography. The compound is detected and measured by gas chromatography with electron capture detection. Residue identity is confirmed by gas chromatography-mass spectrometry with detection at m/z 269.0. The detection limit is 0.01 ppm, and recoveries for control samples fortified with flurprimidol at 0.01-2.0 ppm averaged 80% for soil and 78% for soil-grass samples.

scholarly journals Gas Chromatographic Determination of Pesticide Residues in Malt, Spent Grains, Wort, and Beer with Electron Capture Detection and Mass Spectrometry

2007 ◽  
Vol 90 (2) ◽  
pp. 544-549 ◽  
Author(s):  
Nuria Vela ◽  
Gabriel Prez ◽  
Gins Navarro ◽  
Simn Navarro
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Electron Capture ◽  
Pesticide Residues ◽  
Chromatographic Determination ◽  
Electron Capture Detection ◽  
Selected Ion Monitoring ◽  
Spent Grains ◽  
Relative Standard

Abstract A method for the simultaneous determination of 9 pesticides (dinitroanilines, organophosphorus, triazoles, and pyrimidines) in several products (malt, spent grains, wort, and beer) of the beer industry is reported. Solid samples (malt and spent grains) are extracted by homogenization with a waterhexane mixture, and the pesticides are partitioned with dichloromethane. Liquid samples (wort and beer) are extracted by sonication with a hexanedichloromethane mixture. Determination of pesticide residues was made by capillary gas chromatography with an electron capture detector (ECD). Confirmation of the compounds was performed by gas chromatography/ion trap mass spectrometry in the selected ion monitoring mode. Detection limits for GCECD varied from 0.2 to 5.5 pg for trifluralin and malathion, respectively. Recoveries of the pesticides from spiked samples ranged from 81.2 to 113.7% with a relative standard deviation between 3.47.5%. The method presents good linearity over the studied range (0.0052 g/mL). The proposed method is rapid and reliable and can be useful for routine monitoring during brewing.

Gas-chromatographic determination of polyol profiles in cerebrospinal fluid.

1978 ◽  
Vol 24 (4) ◽  
pp. 545-548 ◽  
Author(s):  
S L Smith ◽  
M Novotny ◽  
E L Weber
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Cerebrospinal Fluid ◽  
Chromatographic Determination ◽  
Gas Chromatography Mass Spectrometry ◽  
Glass Capillary ◽  
Simple Method ◽  
Glass Capillary Columns ◽  
First Time

Abstract We describe a simple method for collectively determining polyols in the cerebrospinal fluid. The method consists of protein removal, sample derivatization, and gas chromatography of the trimethylsilylated polyols, with use of glass capillary columns. Nine major polyol constituents, the structures of which were verified by combined gas chromatography/mass spectrometry, can be simultaneously assayed. The presence of three polyols in the cerebrospinal fluid is reported here for the first time.

Phthalate interference in gas-chromatographic determination of long-chain fatty acids in plasma.

1979 ◽  
Vol 25 (2) ◽  
pp. 308-310 ◽  
Author(s):  
C Geisler ◽  
A R Swanson ◽  
L Zieve ◽  
M W Anders
Keyword(s):  
Mass Spectrometry ◽  
Fatty Acids ◽  
Gas Chromatography ◽  
Accurate Determination ◽  
Chromatographic Determination ◽  
Gas Chromatography Mass Spectrometry ◽  
Long Chain Fatty Acids ◽  
Long Chain ◽  
Chain Fatty Acids

Abstract Phthalates leached from plastic tubing or other plastic devices may interfere with gas-chromatographic determination of long-chain fatty acids in plasma. In the case of hospitalized patients who have received infusions or had blood drawn through plastic tubing, gas chromatography/mass spectrometry may be required for accurate determination of such fatty acids.

scholarly journals Cryoradiolysis of oxygenated cytochrome P450 17A1 with lyase substrates generates expected products

2021 ◽  
Author(s):  
Remigio Usai ◽  
Ilia Denisov ◽  
Stephen Sligar ◽  
James Kincaid
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Cytochrome P450 ◽  
Efficient Method ◽  
Enzymatic Reaction ◽  
Gas Chromatography Mass Spectrometry ◽  
Cryogenic Temperatures ◽  
Γ Irradiation ◽  
Control Samples

When subjected to γ-irradiation at cryogenic temperatures the oxygenated complexes of Cytochrome P450 17A1 bound with either of the lyase substrates, 17-OH PREG or 17-OH PROG are shown here to generate the corresponding lyase products, dehydroepiandrosterone (DHEA) and androstenedione (AD) respectively. The current study uses gas chromatography-mass spectrometry (GC/MS) to document the presence of the initial substrates and products in extracts of the processed samples. A rapid and efficient method for the simultaneous determination of residual substrate and products by GC/MS is described without derivatization of the products. It is also shown that no lyase products were detected for similarly treated control samples containing no nanodisc associated CYP17 enzyme, demonstrating that the product is formed during the enzymatic reaction and not by GC/MS conditions nor the conditions produced by the cryoradiolysis process.

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