Prediction of gas chromatography solute activity coefficients in mixed stationary phases based on the Wilson equation

1990 ◽  
Vol 62 (10) ◽  
pp. 991-994 ◽  
Author(s):  
Jozef J. Comor ◽  
Miroslav M. Kopecni
Keyword(s):  
Gas Chromatography ◽  
Activity Coefficients ◽  
Stationary Phases ◽  
Wilson Equation ◽  
Mixed Stationary Phases

Evaluation of Gas Chromatography Stationary Phases Based on Morpholinium Ionic Liquids by McReynolds Constants and Activity Coefficients at Infinite Dilution

2017 ◽  
Vol 100 (6) ◽  
pp. 1660-1670
Author(s):  
Kateryna Yavir ◽  
Łukasz Marcinkowski ◽  
Adam Kloskowski ◽  
Jacek Namieśnik
Keyword(s):  
Gas Chromatography ◽  
Ionic Liquids ◽  
Activity Coefficients ◽  
Infinite Dilution ◽  
Alkyl Chain ◽  
Stationary Phases ◽  
Alkyl Substituent ◽  
Wide Range ◽  
Kováts Indices ◽  
High Polarity

Abstract In this work, four ionic liquids (ILs) based on the N-alkyl-N-methylmorpholinium cation ([Mor1,R], in which R = 2, 4, 8, or 10) and bis(trifluoromethanesulfonyl)imide anion were synthesized. Using GLC, a number of parameters describing the sorption properties of the investigated ILs were determined. The values of Kovats indices, McReynolds constants, and activity coefficients at infinite dilution were the basis for the evaluation of intermolecular interactions. The effect of the chain length of the alkyl substituent in the cation, which was used to modify their polarity, has been discussed. Comparison of the characteristics of the investigated IL-based stationary phases with commercially available ones allowed for the statement that the investigated ILs were more polar. The tested ILs had a relatively high polarity. Increasing the length of the alkyl chain in the morpholinium ring reduced polarity. ILs based on the morpholinium cation were tunable in a wide range of their polarity.

Ageing of Columns of Homogeneous Mixed Stationary Phases in Gas Chromatography

1979 ◽  
Vol 17 (5) ◽  
pp. 281-284 ◽  
Author(s):  
J. A. G. Dominguez ◽  
E. F. Sanchez ◽  
J. G. Munoz ◽  
M. J. Molera
Keyword(s):  
Gas Chromatography ◽  
Stationary Phases ◽  
Mixed Stationary Phases

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.

Separation of hexenes by gas chromatography on stationary phases with PdCl2

1974 ◽  
Vol 39 (6) ◽  
pp. 1440-1446 ◽  
Author(s):  
M. Kraitr ◽  
R. Komers ◽  
F. Čůta
Keyword(s):  
Gas Chromatography ◽  
Stationary Phases

Retention of some heterocyclic amines on mixed stationary phases containing nickel(II) Schiff base chelates

1989 ◽  
Vol 54 (6) ◽  
pp. 1530-1537 ◽  
Author(s):  
Joanna Masłowska ◽  
Grzegorz Bazylak
Keyword(s):  
Schiff Base ◽  
Stationary Phases ◽  
Capillary Columns ◽  
Heterocyclic Amines ◽  
Complex Mixtures ◽  
Amine Complexes ◽  
Mixed Stationary Phases ◽  
Classical Columns

Stationary phases composed of squalane and some nickel(II)-β-keto amine complexes were prepared and used for the separation of complex mixtures of pyridines. The resolution achieved on short classical columns was comparable with that obtained on capillary columns.

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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