Gas Chromatographic-Mass Spectrometric Analysis, Identification, and Detection of Adulteration of Natural and Concentrated Lemon Oils

1982 ◽  
Vol 65 (1) ◽  
pp. 166-171
Author(s):  
Manfred J Prager ◽  
Michael A Miskiewicz
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Capillary Gas Chromatography ◽  
Mass Spectrometric ◽  
Mass Spectrometric Analysis ◽  
Geranyl Acetate ◽  
Spectrometric Analysis ◽  
Glass Capillary ◽  
Chromatographic Mass

Abstract Lemon oils were characterized by quantitative glass capillary gas chromatography. Components present to the extent of more than 0.05% were measured and identified by mass spectrometry. In expressed lemon oils, monoterpenes and geranial were the only components present at concentrations of 1.0% or more. In concentrated lemon oils, β-caryophyllene, linalool, neral, β-terpineol, neryl acetate, and geranyl acetate were present in some samples in amounts of 1% or more. Adulteration was detected by component concentrations outside characteristic ranges for oils judged to be authentic.

Gas Chromatographic-Mass Spectrometric Detection of Adulteration of Natural Lime Oils

1985 ◽  
Vol 68 (6) ◽  
pp. 1154-1159
Author(s):  
Rocco T Alessandro ◽  
James M Adams ◽  
Michael A Miskiewicz
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Confidence Intervals ◽  
Capillary Gas Chromatography ◽  
Mass Spectrometric ◽  
Mass Spectrometric Detection ◽  
Glass Capillary ◽  
Chromatographic Mass

Abstract Distilled and expressed lime oils were characterized by glass capillary gas chromatography. Components present at concentrations greater than 0.1% were identified by mass spectrometry. Expressed oils contained less than 1% monoterpene alcohols, whereas distilled oils contained more than 10%. Expressed oils contained sabinene and 4 times as much beta-pinene as distilled oils. Adulteration was detected by finding component area percents and/or their ratios to be outside the 95% confidence intervals established for pure oils.

Versatile, efficient system for extracting drugs from urine for gas chromatographic/mass spectrometric analysis.

1989 ◽  
Vol 35 (10) ◽  
pp. 2100-2103 ◽  
Author(s):  
K E Brooks ◽  
N B Smith
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Mass Spectrometric ◽  
Gas Chromatography Mass Spectrometry ◽  
Spectrometric Analysis ◽  
Efficient System ◽  
Carboxylate Groups ◽  
Amino Amide ◽  
Alcoholic Hydroxyl ◽  
Chromatographic Mass

Abstract This is a method for efficiently extracting a wide variety of drugs from urine for toxicological analysis by gas chromatography/mass spectrometry. Before extraction, the urine sample is acetylated, diluted with an equal volume of water, and saturated with NaCl. This solution is then mixed with an equal volume of dichloromethane/acetone (2:1 by vol). The organic (top) phase is aspirated and evaporated, and the residue is redissolved in a suitable solvent for injection or further derivatization. This procedure is suitable for all drugs except carboxylate-containing drugs, which may be isolated by replacing the acetylation step with acidification of the urine to pH 2. Studies with 16 drugs containing amino, amide, alcoholic hydroxyl, phenolic hydroxyl, carboxylate groups, or combinations thereof, showed that all drugs except theophylline and benzoylecgonine were extracted with analytical recoveries ranging from 70% to 100%.

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