scholarly journals The Determination of Tobacco Additives 2nd Report: A Method for Series Analyses of Menthol in Tobacco and Tobacco Products/Zur Bestimmung von Tabakadditiven: 2. Mitteilung: Eine Methode zur serienanalytischen Bestimmung von Menthol in Tabak und Tabakerzeugnissen

1972 ◽  
Vol 6 (3) ◽  
Author(s):  
E. Nesemann ◽  
F. Seehofer
Keyword(s):  
Gas Chromatography ◽  
Detection Limit ◽  
Quantitative Determination ◽  
Coefficient Of Variation ◽  
Steam Distillation ◽  
Tobacco Products

AbstractThe method used in our laboratories since 1965 for the determination of menthol in tobacco and tobacco products has meanwhile been improved and made suitable for series analyses. Menthol is isolated from the mentholated material to be investigated by steam distillation The distillate containing the menthol in question (dissolved in acetone) is directly subjected to gas chromatography for quantitative determination. The recovery was found to amount to 97 %, the coefficient of variation to 1.45 %, and the detection limit to 0.002 mg of menthol per mI.

scholarly journals Methods for the Quantitative Determination of Biocides in Tobacco and Tobacco Products: Part VI: A Modified Procedure for Organochlorine, Organophosphorus and Carbamate Insecticide Residues in Tobacco

1974 ◽  
Vol 7 (5) ◽  
Author(s):  
E. Nesemann ◽  
F. Seehofer
Keyword(s):  
Gas Chromatography ◽  
Quantitative Determination ◽  
Coefficient Of Variation ◽  
Tobacco Products ◽  
Insecticide Residues ◽  
Carbamate Insecticides ◽  
Carbamate Insecticide ◽  
Cleanup Procedure ◽  
Ppm Level

AbstractThe screening procedure for the determination of pesticide residues in tobacco (organochlorine, organophosphorus and carbamate insecticides) published in 1970 has been improved by introduction of the dry-column chromatography as cleanup procedure. A new procedure has been developed for the detection of carbaryl and propoxur by gas chromatography. The extraction and cleanup method developed can be used to determine 11 organochlorine, 11 organophosphorus and 3 carbamate insecticides. The procedure can be applied to determine further insecticides and, in addition, fungicides, herbicides and metabolites. The recoveries of added pesticides at 0.5 ppm level are between 75 and 102 %. The coefficient of variation detected with parathion is 4.4 %

Simple Colorimetric Determination of Carrageenan in Jellies and Salad Dressings

1991 ◽  
Vol 74 (6) ◽  
pp. 1019-1022 ◽  
Author(s):  
Yoshie Yabe ◽  
Takahiro Ninomiya ◽  
Takashi Tatsuno ◽  
Taro Okada
Keyword(s):  
Gas Chromatography ◽  
Detection Limit ◽  
Alcian Blue ◽  
Coefficient Of Variation ◽  
Capillary Gas Chromatography ◽  
Colorimetric Method ◽  
Sample Solution ◽  
Colorimetric Determination ◽  
Chromatography Method

Abstract A simple, rapid colorimetric method is described for the determination of carrageenan (CAR) in foods such as jellies and salad dressings. Alcian blue reagent is added to the sample solution prepared from these foods, then CAR is precipitated selectively as a CAR-alcian blue complex. The precipitate is dissolved in monoethanolamine and determined colorimetrically at 615 nm. Overall recovery for jelly was 93.3% with a coefficient of variation (CV) of 5.8%. Overall recovery for salad dressing was 91.9% with a CV of 3.0%. The detection limit was 0.05%. The results obtained by the proposed method were similar to those obtained by a capillary gas chromatography method.

Methods For The Quantitative Determination Of Biocides In Tobacco And Tobacco Products. Part V: A Method For Rapid Determination Of The Urea Herbicide Metobromuron/Methoden Zur Quantitativen Bestimmung Von Bioziden In Tabak Und Tabakerzeugnissen. V. Mitteilung: Eine Schnellmethode Zur Bestimmung Des Harnstoff-Herbizides Metobromuron (Patoran)

1974 ◽  
Vol 7 (5) ◽  
Author(s):  
E. Nesemann ◽  
F. Seehofer
Keyword(s):  
Quantitative Determination ◽  
Coefficient Of Variation ◽  
Chromatographic Separation ◽  
Rapid Determination ◽  
Tobacco Products ◽  
Aqueous Acetonitrile ◽  
Gas Chromatographic Separation

AbstractDuring the attempt to transfer to tobacco a method commonly used to determine metobromuron in foodstuffs, it became apparent that only very small amounts of metobromuron and less than 0.1 ppm 4-bromoanilin were found. Nor did the modification of this method produce better results, because metobromuron, apparently linked to tobacco components, cannot be extracted with aqueous acetonitrile. The tobacco was then distilled under hydrolysing conditions and the 4-bromoanilin released was bound as hydrochloride. After gas-chromatographic separation 4-bromoanilin is determined specifically with the microcoulometer (bromine) and with the Coulson detector (nitrogen). The amount of metobromuron is calculated from the 4-bromoanilin. With this method no difference can be made between intact metobromuron and 4-bromoanilin already metabolised from metobromuron. Recovery is 90 % for 4-bromoanilin and 92 % for metobromuron, the coefficient of variation is 3.0 %. In cigarettes whose tobacco had grown in soil which had been treated with 4 kg of Patoran per hectare before transplanting, a mean of 5.8 ppm metobromuron was found by this procedure.

Methods for the Quantitative Determination of Biocides in Tobacco and Tobacco Products. Part IV: A Method for the Determination of Maleic Hydrazide in Tobacco/Methoden zur quantitativen Bestimmung von Bioziden in Tabak und Tabakerzeugnissen. IV. Mitteilung: Eine Methode zur Bestimmung von Maleinsäurehydrazid

1974 ◽  
Vol 7 (4) ◽  
Author(s):  
E. Nesemann ◽  
H. Rabitz ◽  
F. Seehofer
Keyword(s):  
Activated Carbon ◽  
Quantitative Determination ◽  
Coefficient Of Variation ◽  
Maleic Hydrazide ◽  
Routine Analysis ◽  
Purification Step ◽  
Tobacco Products

AbstractThe author's method (developed in 1966) for the determination of maleic hydrazide in tobacco has been improved by the introduction of a purification step using activated carbon. Interferences produced by reactive compounds other than maleic hydrazide can thus be eliminated. The procedure proved to be suitable for routine analysis. The coefficient of variation was found to range from 1 to 7 %. Added amounts of maleic hydrazide have been recovered at the 90-105 % level. The accuracy of the procedure could be confirmed by results comparatively obtained in three laboratories

The Determination of Tobacco Additives1st Report: A Method for the Qualitative and Quantitative Determination of Vanillin, Ethylvanillin, Coumarin and Dihydrocoumarin in Tobacco and Tobacco Products/Zur Bestimmung von Tabakadditiven: 1. Mitteilung: Eine Methode zur qualitativen und quantitativen Bestimmung von Vanillin, Aethylvanillin, Cumarin und Dihydrocumarin in Tabak und Tabakerzeugnissen

1970 ◽  
Vol 5 (6) ◽  
Author(s):  
E. Nesemann ◽  
F. Seehofer
Keyword(s):  
Gas Chromatography ◽  
Thin Layer ◽  
Quantitative Determination ◽  
Thin Layer Chromatography ◽  
Screening Method ◽  
Tobacco Products ◽  
Qualitative And Quantitative ◽  
Trimethylsilyl Derivatives ◽  
Layer Chromatography

AbstractA screening method has been developed for the qualitative and quantitative determination of vanillin, ethylvanillin, coumarin and dihydrocoumarin. The compounds are qualitatively determined by thin-layer chromatography after extraction of tobacco and purification of the extract. The quantitative determination is made by gas chromatography: Coumarin and dihydrocoumarin are determined directly and vanillin and ethylvanillin after silylation in the form of trimethylsilyl derivatives. Detection limit: thin-layer chromatography = 1 µg, gas chromatography = 0.02 µg. The coefficient of variation of the results obtained amounts to 2.4 % for vanillin and to 6.7 % for coumarin

Gas Chromatographic Determination of N-Butyl-N-ethyl-α,α,α-trifluoro-2,6-dinitro-p-toluidine and α,α,α-Trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine in Formulations

1971 ◽  
Vol 54 (3) ◽  
pp. 711-712
Author(s):  
Martha Fuzesi
Keyword(s):  
Gas Chromatography ◽  
Quantitative Determination ◽  
Electron Capture ◽  
Chromatographic Method ◽  
Chromatographic Determination ◽  
Electron Capture Detector ◽  
Reference Solution ◽  
Gas Chromatographic Method

Abstract A gas chromatographic method is described for the quantitative determination of N-butyl-N-ethyl-α,α,α-trifluoro-2,6-dinitro-p-tolindine and α,α,α-trifluoro-2,6-dinitro-N,N-dipropyI-p-toluidine herbicides in formulations. The sample is extracted with benzene, and equal amounts of sample and reference solution in the same concentration range are analyzed by gas chromatography, using an electron capture detector and an SE-30/Diatoport S column. The method has been applied successfully to laboratory-prepared and commercial samples.

Liquid Chromatographic Determination of Sulfamoyldapsone in Swine Tissues

1987 ◽  
Vol 70 (6) ◽  
pp. 1031-1032
Author(s):  
Yuuko S Endoh ◽  
Ryozo Yamaoka ◽  
Nobuo Sasaki
Keyword(s):  
Detection Limit ◽  
Quantitative Determination ◽  
Chromatographic Determination ◽  
Alumina Column ◽  
Average Recovery ◽  
Diaminodiphenyl Sulfone ◽  
Alumina Column Chromatography ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A liquid chromatographic (LC) method is described for the quantitative determination of sulfamoyldapsone (2-sulfamoyl-4,4'-diaminodiphenyl sulfone) in swine muscle, liver, kidney, and fat. Sulfamoyldapsone was extracted from tissues with acetonitrile saturated with n-hexane. The extract was washed with n-hexane saturated with acetonitrile, concentrated, and cleaned up by alumina column chromatography. Sulfamoyldapsone was separated on an ODS column by using acetonitrile-methanol-water (6 + 18 + 76) and was detected at 292 nm. Overall average recovery of sulfamoyldapsone added to tissues at levels of 0.1 and 0.5 /μg/g was 93.3% ± 6.0. Detection limit was 0.02 μg/g in these tissues.

Sign in / Sign up

Export Citation Format

Share Document