The Complete Analysis of Gas Phase Photolysis and Radiolysis Product Mixtures by Gas Chromatography

1969 ◽  
Vol 7 (7) ◽  
pp. 418-424 ◽  
Author(s):  
E. Heckel ◽  
R. J. Hanrahan
Keyword(s):  
Gas Chromatography ◽  
Gas Phase ◽  
Radiolysis Product ◽  
Complete Analysis

Stereospecific analysis of triacylglycerols via racemic phosphatidylcholines and phospholipase C

1979 ◽  
Vol 57 (2) ◽  
pp. 117-124 ◽  
Author(s):  
J. J. Myher ◽  
A. Kuksis
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Phospholipase C ◽  
Fatty Acid Distribution ◽  
Stereospecific Analysis ◽  
Complete Analysis ◽  
Practical Application ◽  
Random Generation ◽  
Grignard Degradation

A method of simultaneous determination of stereospecific distribution and molecular association of acyl groups in triacylglycerols has been developed. The analysis is based on a random generation of rac-1, 2-diacylglycerols by Grignard degradation, synthesis of rac-phosphatidylcholines, and a stereospecific stepwise release of 1, 2-sn- and 2, 3-sn-diacylglycerols by phospholipase C. The exact structure of the original triacylglycerols is reconstituted on the basis of complete analysis of the molecular species of the 1, 2-sn- and 2, 3-sn-diacylglycerols as the tertiary-butyldimethylsilyl ethers by gas chromatography with mass spectrometry. The validity of the method is demonstrated by analyses of synthetic triacylglycerols of known structure. A practical application is illustrated by determination of the fatty acid distribution in lard.

Determination of Hydrocarbon Solubility in Sea Water and the Analysis of Hydrocarbons in Water-Extracts

1973 ◽  
Vol 1973 (1) ◽  
pp. 223-227 ◽  
Author(s):  
Stanley P. Wasik ◽  
Robert L. Brown
Keyword(s):  
Gas Chromatography ◽  
Gas Phase ◽  
Sea Water ◽  
Water Extract ◽  
Complex Mixtures ◽  
Hydrocarbon Group ◽  
Water Extracts ◽  
Peak Areas ◽  
Overlapping Peaks

ABSTRACT An apparatus is described for measuring the solubility of hydrocarbons in sea water and for analyzing hydrocarbons in water-extracts. The relative concentrations of the hydrocarbons in the gas phase in equilibrium with the water extract were determined by gas chromatography. A known volume of the gas phase was purged out from the apparatus and replaced with helium. The concentration of the hydrocarbons were measured after the second equilibration. The solubility of the hydrocarbon solutes in the sea water extract were determined from the peak area ratios of the solute peaks and the volume of the apparatus. Complex mixtures of hydrocarbons in aqueous solutions may be analyzed using this apparatus by examining the chromatograms obtained after each flush out. The peaks are identified as to hydrocarbon group (olefinic, aromatic, paraffinic) from the rate that the solute peak area decreases after each flush out. Overlapping peaks may be resolved using this technique. By extrapolating peak areas to zero flush out, the concentration of each solute in the original extract may be obtained. The analysis of a non-lead gasoline in sea water is presented.

Monolithic porous layer open tubular (monoPLOT) capillary columns for gas chromatography

RSC Advances ◽  
2015 ◽  
Vol 5 (11) ◽  
pp. 7890-7896 ◽  
Author(s):  
Ekaterina P. Nesterenko ◽  
Maurice Burke ◽  
Christophe de Bosset ◽  
Paulo Pessutto ◽  
Claire Malafosse ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Gas Phase ◽  
Porous Layer ◽  
Capillary Columns ◽  
Phase Separations ◽  
Tubular Columns ◽  
Solid Adsorbent ◽  
Open Tubular Columns

Polymer monolithic open tubular columns are presented as a solid adsorbent for fast and efficient gas phase separations.

Sign in / Sign up

Export Citation Format

Share Document