scholarly journals The gas-liquid chromatography of carboxylic acid esters of the urinary 11-deoxy-17-oxo steroids. Determination as n-butyrates

1967 ◽  
Vol 103 (3) ◽  
pp. 768-772 ◽  
Author(s):  
PA Sadler ◽  
AE Kellie
Keyword(s):  
Liquid Chromatography ◽  
Carboxylic Acid ◽  
Gas Liquid Chromatography ◽  
Acid Esters

Gas-liquid chromatography of saturated fluorinated carboxylic acid esters 1. Retention in homologous series

1991 ◽  
Vol 40 (2) ◽  
pp. 359-365
Author(s):  
E. P. Promyshlennikova ◽  
V. E. Kirichenko ◽  
K. I. Pashkevich ◽  
D. N. Grigor'eva ◽  
R. V. Golovnya
Keyword(s):  
Liquid Chromatography ◽  
Carboxylic Acid ◽  
Homologous Series ◽  
Gas Liquid Chromatography ◽  
Acid Esters

Confirmatory Identification of Carbadox-Related Residues in Swine Liver by Gas-Liquid Chromatography/Mass Spectrometry with Selected Ion Monitoring

1982 ◽  
Vol 65 (1) ◽  
pp. 66-70 ◽  
Author(s):  
Martin J Lynch ◽  
S Richard Bartolucci
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Carboxylic Acid ◽  
Gas Liquid Chromatography ◽  
Target Tissue ◽  
Liquid Chromatography Mass Spectrometry ◽  
Selected Ion Monitoring ◽  
Methyl Ester Derivative ◽  
Chromatography Mass Spectrometry ◽  
Swine Liver

Abstract A confirmatory method has been developed to identify quinoxaline-2-carboxylic acid, the carbadox tissue residue, in swine liver, a target tissue, at the regulatory level of 30 μg/kg. Quinoxaline-2-carboxylic acid (QCA) is isolated from liver hydrolysates by solvent extraction and ion-exclusion chromatography, and a methyl ester derivative (CP-25,536 or QME) is identified by gas-liquid chromatography/ mass spectrometry with selected ion monitoring. The relative intensities of 3 ions: the base peak at m/z = 130, a second significant mass at m/z = 158, and the molecular ion (M+) at m/z = 188, are monitored simultaneously with a quadrupole mass spectrometer. Validation studies consisting of the analysis of liver fortified with QCA at the regulatory level and analysis of swine specimens containing physiologically incurred carbadox residues demonstrated that peak height ratios of ions in these tissue extracts corresponded to ion intensities of standards monitored at m/z = 188,158, and 130.

THE CHEMICAL COMPOSITION OF THE WOOD EXTRACTIVES OF SORBUS DECORA (SARG.) SCHNEID.

1962 ◽  
Vol 40 (6) ◽  
pp. 1118-1122 ◽  
Author(s):  
N. Narasimhachari ◽  
E. Von Rudloff
Keyword(s):  
Liquid Chromatography ◽  
Fatty Acid ◽  
Chemical Composition ◽  
Fatty Acid Esters ◽  
Gas Liquid Chromatography ◽  
Wood Extractives ◽  
Mountain Ash ◽  
Soluble Material ◽  
Acid Esters ◽  
Detection And Separation

The wood of the showy mountain ash was found to contain about 3% acetone-soluble material. The major constituents of the extract were a polymorphous xyloside of (+)-di-methoxyisolariciresinol, the recently discovered hydroxy diphenyls aucuparin and methoxyaucuparin, and fatty acid esters of β-sitosterol, another phytosterol, and of untractable phenolic material. Small amounts of free β-sitosterol and a mixture of hydrocarbons as well as traces of an unknown leucoanthocyanidin were also isolated. The xyloside predominated in the sapwood, whereas the aucuparins were found mainly in the heartwood. Gas–liquid chromatography was instrumental in the detection and separation of the aucuparins.

Thin Layer, Column, and Gas Liquid Chromatography of Resin Acid Esters and Related Terpenes.

1963 ◽  
Vol 17 ◽  
pp. 1828-1830 ◽  
Author(s):  
Torbjörn Norin ◽  
Lars Westfelt ◽  
Erling Røst ◽  
Arne Steffensen ◽  
Jon Munch-Petersen
Keyword(s):  
Liquid Chromatography ◽  
Thin Layer ◽  
Resin Acid ◽  
Gas Liquid Chromatography ◽  
Acid Esters

scholarly journals Comparative Study of the Anthranilic Acid Esters by Ultraviolet Spectrophotometry, Colorimetry, Gravimetry, and Gas-Liquid Chromatography

1965 ◽  
Vol 48 (2) ◽  
pp. 341-343
Author(s):  
Richard L Brunelle ◽  
Glenn E Martin ◽  
V G Ohanesian
Keyword(s):  
Liquid Chromatography ◽  
Chromatographic Method ◽  
Steam Distillation ◽  
Gas Liquid Chromatography ◽  
Ultraviolet Spectrophotometry ◽  
Characteristic Peak ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic ◽  
Acid Esters

Abstract A rapid and specific gas-liquid chromatographic method has been developed for the separation and quantitative determination of methyl and ethyl anthranilate in grape extracts and imitation grape flavors in the presence of interfering substances. Total methyl and ethyl anthranilate can be quantitatively determined in imitation grape flavors by ultraviolet spectrophotometry after steam distillation of the sample. Methyl and ethyl anthranilate show a characteristic peak at 335 mμ. Results for methyl and ethyl anthranilate by gas-liquid chromatography and ultraviolet spectrophotometry are compared with those obtained by the official AOAC methods.

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