Study of 3-(5-X-2-furyl)acrylic acids and their methyl esters by gas chromatography

1979 ◽  
Vol 44 (3) ◽  
pp. 942-945 ◽  
Author(s):  
Oľga Rajniaková ◽  
Jarmila Štetinová ◽  
Jaroslav Kováč
Keyword(s):  
Gas Chromatography ◽  
Stationary Phases ◽  
Methyl Esters ◽  
Chromatographic Parameters ◽  
Acrylic Acids

The Kovát's indices and homomorphous factors of 3-(5-substituted-2-furyl)acrylic acids and their methyl esters were determined on stationary phases UCW 98 and OV 17 at 180 °C. It was found that the values of both chromatographic parameters increase with increasing polarity of the molecule.

Ionic liquids as stationary phases for fatty acid analysis by gas chromatography

The Analyst ◽  
2017 ◽  
Vol 142 (24) ◽  
pp. 4601-4612 ◽  
Author(s):  
C. Fanali ◽  
G. Micalizzi ◽  
P. Dugo ◽  
L. Mondello
Keyword(s):  
Gas Chromatography ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Fatty Acid ◽  
Fatty Acid Methyl Esters ◽  
Stationary Phases ◽  
Methyl Esters ◽  
Fatty Acid Analysis ◽  
Gc Analysis ◽  
Acid Methyl

The present paper provides an overview of the application of ionic liquid (IL) columns for GC analysis of fatty acid methyl esters (FAMEs).

Relations between chromatographic parameters and physical properties of some alkyl tert-butyl ethers

1982 ◽  
Vol 47 (7) ◽  
pp. 1979-1987 ◽  
Author(s):  
Michal Šingliar ◽  
Vendelín Macho ◽  
Miroslav Kavala
Keyword(s):  
Gas Chromatography ◽  
Stationary Phase ◽  
Physical Properties ◽  
Homologous Series ◽  
Stationary Phases ◽  
Elution Order ◽  
Tert Butyl ◽  
Stationary Phase Polarity ◽  
Chromatographic Parameters ◽  
Retention Parameters

Retention parameters of alkyl tert-butyl ethers have been measured by gas chromatography using stationary phases of various polarity. The stationary phase polarity influences elution order of a pair alcohol/ether as well as their resolution degree. Dependence of log Vg vs boiling temperature of the ethers is linear within a given homologous series of compounds except for the first two members. The retention times of ethers and alcohols have been found to coincide when using di-n-heptyl phthalate as stationary phase.

Analysis of Aromatic Amines in Industrial Wastewater by Capillary Gas Chromatography-Mass Spectrometry

2000 ◽  
Vol 35 (2) ◽  
pp. 245-262 ◽  
Author(s):  
Francis I. Onuska ◽  
Ken A. Terry ◽  
R. James Maguire
Keyword(s):  
Gas Chromatography ◽  
Aromatic Amines ◽  
Methylene Chloride ◽  
Solid Phase ◽  
Stationary Phases ◽  
Gas Chromatography Mass Spectrometry ◽  
Substituted Anilines ◽  
Environmental Media ◽  
Solid Phase Extraction Cartridge ◽  
Wide Range

Abstract The analysis of aromatic amines, particularly benzidines, at trace levels in environmental media has been difficult because of the lack of suitable deactivated capillary column stationary phases for gas chromatography. This report describes the use of an improved type of column as well as a method for the analysis of anilines and benzidines in water, wastewater and sewage samples. Extraction procedures are applicable to a wide range of compounds that are effectively partitioned from an aqueous matrix into methylene chloride, or onto a solid-phase extraction cartridge. The extracted analytes are also amenable to separation on a capillary gas chromatographic column and transferable to the mass spectrometer. These contaminants are converted to their N-trifluoroacetyl derivatives. Aniline and some substituted anilines, and 3,3’-dichlorobenzidine and benzidine were determined in 24-h composite industrial water, wastewater, primary sludge and final effluent samples at concentrations from 0.03 up to 2760 µg/L.

Chiral separation and analysis of antifungal drugs by chromatographic and electromigration techniques: Results achieved in 2010–2020

2021 ◽  
Vol 40 (1) ◽  
pp. 220-252
Author(s):  
Giovanni D’Orazio ◽  
Chiara Fanali ◽  
Chiara Dal Bosco ◽  
Alessandra Gentili ◽  
Salvatore Fanali
Keyword(s):  
Gas Chromatography ◽  
Pharmaceutical Industry ◽  
State Of The Art ◽  
Stationary Phases ◽  
Enantiomeric Separation ◽  
Antifungal Drugs ◽  
Chiral Discrimination ◽  
Food Science ◽  
Industry Environment ◽  
Metabolic Activities

Abstract The determination and separation of enantiomers is an interesting and important topic of research in various fields, e.g., biochemistry, food science, pharmaceutical industry, environment, etc. Although these compounds possess identical physicochemical properties, a pair of enantiomers often has different pharmacological, toxicological, and metabolic activities. For this reason, chiral discrimination by using chromatographic and electromigration techniques has become an urgent need in the pharmaceutical field. This review intends to offer the “state of the art” about the separation of chiral antifungal drugs and several related precursors by both liquid and gas chromatography, as well as electromigration methods. This overview is organized into two sections. The first one describes general considerations on chiral antifungal drugs. The second part deals with the main analytical methods for the enantiomeric discrimination of these drugs, including a brief description of chiral selectors and stationary phases. Moreover, many recent applications attesting the great interest of analytical chemists in the field of enantiomeric separation are presented.

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