New Approach to Derivatization and Gas-Chromatographic Analysis of Barbiturates

1974 ◽  
Vol 20 (2) ◽  
pp. 192-194 ◽  
Author(s):  
Richard H Greeley
Keyword(s):  
Gas Chromatography ◽  
Chromatographic Analysis ◽  
Methyl Esters ◽  
Soluble Salts ◽  
New Approach ◽  
Gas Chromatographic Analysis ◽  
Alkyl Derivatives ◽  
High Resolution Gas Chromatography ◽  
Alkyl Iodides ◽  
Derivatives Of

Abstract A recently developed procedure for alkylation of organic acids has proven extremely successful for preparation of volatile alkyl derivatives of the barbiturates for gas-chromatographic analysis. Soluble salts are formed in a mixture of N,N-dimethylacetamide and methanol. These in turn react rapidly with alkyl iodides to form the corresponding alkyl derivatives. The butyl derivatives of barbiturates, prepared in this manner, are separable by high-resolution gas-chromatography. Any of 14 barbiturates can be determined simultaneously or separately (although there is some overlap with certain uncommon barbiturates). The butyl derivatives of several barbiturates that are unresolved in the form of underived compounds or methyl esters can be resolved, thus overcoming many previous analytical limitations.

Gas Chromatographic Determination of 2,4-D and 2,4,5-T and Their Derivatives in Commercial Formulations

1965 ◽  
Vol 48 (2) ◽  
pp. 327-333
Author(s):  
Patricia L Pursley ◽  
E D Schall
Keyword(s):  
Gas Chromatography ◽  
Chromatographic Analysis ◽  
Methyl Esters ◽  
Chromatographic Determination ◽  
Dichlorophenoxyacetic Acid ◽  
Alkyl Esters ◽  
Boron Trichloride ◽  
Acid Gas ◽  
Gas Chromatographic Analysis

Abstract A solution of boron trichloride in methanol was employed for the complete transcsterification of 2,4-D and 2,4,5-T esters to the corresponding methyl esters. Gas chromatographic analysis of the methyl esters permitted mixtures of 2,4-D and 2,4,5-T esters in commercial formidations to be analyzed both qualitatively and quantitatively with no sample cleanup. The method is highly specific and detected the presence of other contaminating isomers of dichlorophenoxyacetic acid. Gas chromatography was also used to qualitatively analyze mixtures of various alkyl esters of 2,4-D.

scholarly journals GAS CHROMATOGRAPHIC ANALYSIS OF THE CHEMICAL COMPOSITION OF ETHYL ALCOHOL OBTAINED FROM PLANTS OF THE GENUS ASTERACEAE

2021 ◽  
Vol 2 (446) ◽  
pp. 6-13
Author(s):  
G.E. Azimbayeva ◽  
A.K. Kamysbayeva ◽  
Abdigali Bakibaev
Keyword(s):  
Gas Chromatography ◽  
Chemical Composition ◽  
Ethyl Alcohol ◽  
Chromatographic Analysis ◽  
Raw Materials ◽  
Jerusalem Artichoke ◽  
Chromatography Method ◽  
Impurity Composition ◽  
Plant Raw Materials ◽  
Gas Chromatographic Analysis

In recent years, serious attention has been paid around the world to the chemical and biotechnological processing of biomass of easily renewable plant raw materials. One of the most mass-produced aliphatic alcohols is ethyl alcohol. The aim of this work was gas chromatographic analysis of the chemical composition of ethyl alcohol obtained from plants of the genus Asteraceae (dahlia and jerusalem artichoke tubers, chicory and big burdock roots) growing on the territory of Kazakhstan. The article discusses the methods of obtaining and application of ethyl alcohol. The results of the analysis of the chemical composition of ethyl alcohol obtained from plants of the genus Asteraceae are presented. As a result of the study, alcohols were obtained in different concentrations. The chemical composition of ethyl alcohol was determined by gas chromatography. The impurity composition of ethyl alcohol obtained from various types of raw materials is also shown. The composition of impurities in various samples of ethanol and alcohol-containing products is considered in detail. The results of the study were discussed, and the peculiarities of using the gas chromatography method were shown.

scholarly journals Identification of Bacillus anthracis from Culture Using Gas Chromatographic Analysis of Fatty Acid Methyl Esters

2005 ◽  
Vol 88 (1) ◽  
pp. 178-181 ◽  
Author(s):  
Myron Sasser ◽  
Craig Kunitsky ◽  
Gary Jackoway ◽  
John W Ezzell ◽  
Jeffrey D Teska ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Bacillus Anthracis ◽  
Chromatographic Analysis ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Gas Chromatographic Analysis ◽  
Acid Methyl

scholarly journals Unusual Regularity in GC Retention of Simple Amino Acid Derivatives

2019 ◽  
Vol 6 (1) ◽  
pp. 3-14 ◽  
Author(s):  
Igor G. Zenkevich ◽  
Nino G. Todua ◽  
Anzor I. Mikaia
Keyword(s):  
Gas Chromatography ◽  
Retention Index ◽  
Methyl Esters ◽  
Elution Order ◽  
Alkyl Esters ◽  
Methyl Group ◽  
The Difference ◽  
Direct Use ◽  
Derivatives Of

Background: Application of simple regularities and general principles along with direct use of reference gas chromatography retention index data for reliable structure determination of compounds can be enhanced by determination of new regularities that are specific to certain structural elements. Objective: Revelation and interpretation of an anomaly in the elution order of alkyl esters of alkoxycarbonyl derivatives of glycine and alanine on standard and semi-standard non-polar phases. Method: Preliminary derivatization of amino acids to alkyl esters of N-alkoxycarbonyl analogs and interpretation of their gas chromatographic characteristics. Results: Alkyl esters of N-alkoxycarbonyl derivatives of alanine (Alkyl = C2H5, n- and iso-C3H7) elute prior to the same derivatives of glycine, despite the presence of an additional methyl group at C(2) in the molecule. Elution order is reversed for methyl esters of N-methoxycarbonyl derivatives. Conclusion: It is established that the peculiar behavior of alkyl esters of N-alkoxycarbonyl derivatives of glycine and alanine agrees with the concepts of gas chromatography and the known retention index regularities of organic compounds. A decrease of retention index values is a result of an introduction of an additional methyl group to a carbon atom connected to two polar fragments in a molecule like CH2XY. The dependence of the difference of retention index values for homologs of the types of CH3-CHXY and CH2XY vs. the total mass of fragments (X + Y) is similar to those for other sub-groups of analytes.

Establishing the Maximum Carbon Number for Reliable Quantitative Gas Chromatographic Analysis of Heavy Ends Hydrocarbons. Part 2. Migration and Separation Gas Chromatography Modeling

2013 ◽  
Vol 27 (4) ◽  
pp. 2336-2350 ◽  
Author(s):  
Diana M. Hernandez-Baez ◽  
Alastair Reid ◽  
Antonin Chapoy ◽  
Bahman Tohidi ◽  
Roda Bounaceur
Keyword(s):  
Gas Chromatography ◽  
Chromatographic Analysis ◽  
Carbon Number ◽  
Gas Chromatographic Analysis

Measurement of the polarity of alkyl derivatives of diazapolyoxyethylene ethers by gas chromatography

1988 ◽  
Vol 454 ◽  
pp. 51-63 ◽  
Author(s):  
Adam Voelkel ◽  
Jan Szymanowski ◽  
Jörg Beger ◽  
Horst Rüstig
Keyword(s):  
Gas Chromatography ◽  
Alkyl Derivatives ◽  
Derivatives Of
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