Persistent organic chemicals in sewage effluents. 2. Quantitative determinations of nonylphenols and nonylphenol ethoxylates by glass capillary gas chromatography

1982 ◽  
Vol 16 (11) ◽  
pp. 800-805 ◽  
Author(s):  
Euripides. Stephanou ◽  
Walter. Giger
Keyword(s):  
Gas Chromatography ◽  
Capillary Gas Chromatography ◽  
Organic Chemicals ◽  
Nonylphenol Ethoxylates ◽  
Glass Capillary ◽  
Sewage Effluents ◽  
Persistent Organic Chemicals

Flavor Composition of Maryland Tobacco

1984 ◽  
Vol 12 (5) ◽  
Author(s):  
Joseph N. Schumacher
Keyword(s):  
Gas Chromatography ◽  
Liquid Chromatography ◽  
Capillary Gas Chromatography ◽  
Methylene Chloride ◽  
Minor Component ◽  
The Other ◽  
Glass Capillary ◽  
Preparative Liquid Chromatography ◽  
Gas Chromatography Mass Spectroscopy ◽  
Trace Components

AbstractThis study was undertaken to determine if Maryland tobacco contains any unique flavour components and to compare its composition to that of flue-cured and Burley tobaccos. Methylene chloride extracts prepared from these tobaccos were fractionated by liquid-liquid partitions and by preparative liquid chromatography. The resulting fractions were analysed by glass capillary gas chromatography and by glass capillary gas chromatography / mass spectroscopy. The essential oils of these tobaccos were also examined. Only one minor component was found in Maryland tobacco that was not found in the other tobaccos. If the minor and trace components were further studied, other differences might be found. Based on this study, however, the uniqueness of Maryland tobacco is primarily, if not entirely, due to quantitative differences. Also, Maryland tobacco is no more similar to Burley (middle-stalk or low-stalk leaves) than it is to flue-cured tobacco.

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