Comparative study of some columns for direct determination of carbofuran by gas—liquid chromatography with nitrogen-specific detection

1990 ◽  
Vol 519 (2) ◽  
pp. 359-362 ◽  
Author(s):  
Concepcion F. Ling ◽  
Gonzalo P. Melian ◽  
Fernando Jimenez-Conde ◽  
Eugenio Revilla
Keyword(s):  
Liquid Chromatography ◽  
Comparative Study ◽  
Direct Determination ◽  
Gas Liquid Chromatography ◽  
Specific Detection

Analysis of Potato Glycoalkaloids by Gas-Liquid Chromatography of Alkaloid Components

1980 ◽  
Vol 63 (6) ◽  
pp. 1226-1230 ◽  
Author(s):  
Russell R King
Keyword(s):  
Liquid Chromatography ◽  
Lower Limit ◽  
Direct Determination ◽  
Gas Liquid Chromatography ◽  
Potato Tubers ◽  
Potato Glycoalkaloids ◽  
Nitrogen Phosphorus Detector ◽  
Liquid Chromatographic ◽  
Nitrogen Phosphorus

Abstract A gas-liquid chromatographic (GLC) method has been developed for the analysis of potato glycoalkaloids by direct determination of the alkaloid components isolated by hydrolysis with IN ethanolic HCl. Recoveries of solanidine from potato tubers and foliage fortified with solanine over a range approximately 0.5 to 5 times the glycoalkaloid originally present averaged greater than 95%, and the lower limit of sensitivity was 0.25 mg/100 g using a nitrogen-phosphorus detector. A means of distinguishing solanidine and demissidine by formation of their respective 3β-trifluoroacetates with trifluoroacetic anhydride (TFAA) is demonstrated.

scholarly journals Direct determination of low molecule fatty acids by gas-liquid chromatography.

1962 ◽  
Vol 11 (4) ◽  
pp. 432-434 ◽  
Author(s):  
Kiyosi FUKUI ◽  
Hideo NAGATOMI ◽  
Saburo MURATA
Keyword(s):  
Fatty Acids ◽  
Liquid Chromatography ◽  
Direct Determination ◽  
Gas Liquid Chromatography

Direct Determination of N'-Phenyl Urea Derivatives in Herbicide Technical Products and Formulations, Using Gas-Liquid Chromatography

1974 ◽  
Vol 57 (6) ◽  
pp. 1294-1299 ◽  
Author(s):  
Hansueli Buser ◽  
Karl Grolimund
Keyword(s):  
Liquid Chromatography ◽  
Internal Standard ◽  
Direct Determination ◽  
Gas Liquid Chromatography ◽  
Scanning Calorimetry ◽  
Urea Derivatives ◽  
Flame Ionization ◽  
Stability Data ◽  
Technical Products

Abstract The direct gas-liquid chromatography of a number of N'-phenyl-.N,N-dimethylureas and N'- phenyl-N-methoxy-N-methylureas has been investigated. Representatives of both groups have been studied in detail, calibration curves using an internal standard have been established, and herbicide technical products as well as formulations have been analyzed quantitatively. A 2 or 3% silicone SE-30 column was used in conjunction with a flame ionization detector. Operating temperatures were chosen on the basis of thermal stability data obtained by differential scanning calorimetry. Gas-liquid chromatography- mass spectroscopy coupling has confirmed that intact urea compounds elute from the chromatographic column.

GASCHROMATOGRAPHIC DETERMINATION OF STEROIDS IN THE URINE OF PATIENTS WITH CUSHING'S SYNDROME

1971 ◽  
Vol 67 (2) ◽  
pp. 303-315 ◽  
Author(s):  
A. J. Moolenaar ◽  
A. P. van Seters
Keyword(s):  
Liquid Chromatography ◽  
Cushing’S Syndrome ◽  
Normal Subjects ◽  
Diagnostic Value ◽  
Cushing's Syndrome ◽  
Gas Liquid Chromatography ◽  
Obese Subjects

ABSTRACT The 17-oxosteroids were estimated in the urine of 27 patients with Cushing's syndrome by gas-liquid chromatography (G. L. C.). The values of the various steroid fractions are compared with those of normal subjects, patients with thyrotoxicosis and obese subjects. The effect of the age of the patients on the diagnostic value of the invidual 17-oxosteroids and their ratios is discussed.

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