Headspace gas chromatographic determination of β-ga-lactosidase activity using electron-capture detection

1985 ◽  
Vol 321 ◽  
pp. 385-391 ◽  
Author(s):  
Benny Køppen ◽  
Lars Dalgaard
Keyword(s):  
Electron Capture ◽  
Chromatographic Determination ◽  
Electron Capture Detection ◽  
Headspace Gas

Gas Chromatographic Determination of Captan, Folpet, and Captafol Residues in Tomatoes, Cucumbers, and Apples Using a Wide-Bore Capillary Column: Interlaboratory Study

1991 ◽  
Vol 74 (5) ◽  
pp. 830-835 ◽  
Author(s):  
Dalia M Gilvydis ◽  
Stephen M Walters
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Capillary Column ◽  
Chromatographic Determination ◽  
Interlaboratory Study ◽  
Electron Capture Detection ◽  
Coefficients Of Variation ◽  
Capillary Column Gas Chromatography ◽  
Ppm Level

Abstract An interlaboratory study of the determination of captan, folpet, and captafol in tomatoes, cucumbers, and apples was conducted by 4 laboratories using wide-bore capillary column gas chromatography with electron capture detection. The 3 fungicides were determined using the Luke et al. multlresidue method modified to Include additional solvent elutlon in the optional Florisll column cleanup step used with this method. The crops were fortified with each fungicide at 3 levels per crop. Mean recoveries ranged from 86.2% for a 25.1 ppm level of captan in apples to 115.4% for a 0.288 ppm level of captafol In apples. Interlaboratory coefficients of variation ranged from 3.4% (24.7 ppm folpet) to 9.7% (0.243 ppm captafol) for tomatoes; from 2.8% (2.0 ppm captafol) to 8.2% (24.8 ppm captan) for cucumbers; and from 1.5% (0.234 ppm folpet) to 22.1% (0.266 ppm captafol) for apples.

Electron Capture Gas Chromatographic Determination of Traces of Formaldehyde in Milk as the 2,4-Dinitrophenylhydrazone

1986 ◽  
Vol 69 (4) ◽  
pp. 655-657
Author(s):  
Katherine E Buckley ◽  
Lorne J Fisher ◽  
Vernon G MacKay
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Quantitative Method ◽  
Chromatographic Method ◽  
Packed Column ◽  
Chromatographic Determination ◽  
Electron Capture Detection ◽  
External Standard

Abstract A quantitative method is described for the determination of formaldehyde in milk by packed-column gas chromatography and electron capture detection. Aldehyde derivatization was carried out in situ with 2,4-dinitrophenyIhydrazine followed by extraction and analysis using an external standard. Average recoveries of 96.3 ± 1.6% were characteristic of the chromatographic method with an estimated detection limit of 0.026 mg/kg. The technique was applied to determination of formaldehyde in milk from cows consuming a formalin-treated feedstuff.

Gas Chromatographic Determination of Deoxynivalenol in Wheat with Electron Capture Detection: Collaborative Study

1986 ◽  
Vol 69 (5) ◽  
pp. 899-901 ◽  
Author(s):  
George M Ware ◽  
Octave J Francis ◽  
Allen S Carman ◽  
Shia S Kuan ◽  
◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Collaborative Study ◽  
Control Sample ◽  
Chromatographic Determination ◽  
Electron Capture Detection ◽  
Average Recovery ◽  
Repeatability And Reproducibility ◽  
The Mean

Abstract Ten laboratories participated in a collaborative study of a method for the determination of deoxynivalenol in wheat by gas chromatography with electron capture detection. Each laboratory analyzed 6 samples in duplicate. Each collaborator received samples spiked at the 100.3, 501.3, and 1002.6 ng/g levels; a control sample; and 2 naturally contaminated samples. The average recovery (outliers excluded) for the spiked samples was 92.2%. The mean repeatability and reproducibility, respectively, were 32.2 and 41.3% for the spiked samples and 30.9 and 47.6% for the naturally contaminated samples. The method was adopted official first action.

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