Working range of packed columns and capillary columns in gas chromatography

1978 ◽  
Vol 1 (6) ◽  
pp. 321-326 ◽  
Author(s):  
R. E. Kaiser ◽  
W. Bertsch
Keyword(s):  
Gas Chromatography ◽  
Capillary Columns ◽  
Packed Columns

Short Glass Micro-Packed Columns for Gas Chromatography

1994 ◽  
Vol 59 (3) ◽  
pp. 589-594
Author(s):  
Karel Komárek
Keyword(s):  
Gas Chromatography ◽  
Carboxylic Acids ◽  
Solid Phase ◽  
Chlorinated Hydrocarbons ◽  
Capillary Columns ◽  
Packed Columns ◽  
Glass Capillary ◽  
Porous Sorbent ◽  
Glass Capillary Columns ◽  
Short Glass

For a quick analysis of simple mixtures of lower chlorinated hydrocarbons a possible application has been studied of short glass micro-packed columns packed with commercial sorbents for extraction by solid phase. For analyses of lower alcohols, carboxylic acids, and other oxygen-containing substances the columns were packed with the organic porous sorbent, a copolymer of divinylbenzene and 1,4-di(methacryloyloxymethyl)naphthalene. The chosen sorbents were placed into glass capillary columns of 0.4 - 0.7 m length and 0.7 mm i.d. As the sorbent amount in the column is small, the columns are cheap. Whenever necessary, they can be prepared in any laboratory. The analyses of simple mixtures of above-mentioned classes of compounds lasted from 90 to 270 s.

STEROIDS IN NEWBORNS AND INFANTS

1973 ◽  
Vol 74 (1) ◽  
pp. 157-167 ◽  
Author(s):  
C. H. L. Shackleton ◽  
J.-Å. Gustafsson ◽  
F. L. Mitchell
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Urine Sample ◽  
Capillary Columns ◽  
Packed Columns ◽  
Gas Chromatography Mass Spectrometry ◽  
Urinary Steroids ◽  
Trimethylsilyl Ethers ◽  
Steroid Excretion ◽  
Cortisol Metabolites

ABSTRACT Urinary steroids from infants one to nine months of age have been analysed by gas chromatography and combined gas chromatography-mass spectrometry. Open tubular capillary columns were used for the gas chromatographic analyses. These greatly improved the resolution of steroid methyloxime-trimethylsilyl ethers over that obtained with packed columns. The major 3β-hydroxy-Δ5 steroids found in the younger infants were 3β,16α-dihydroxy-5-androsten-17-one, 3β,17β-dihydroxy-5-androsten-16-one, 5-androstene-3β,16α,17β-triol and 3β,16α-dihydroxy-5-pregnen-20-one. In the older infants 5-pregnene-3β,20α-diol and 5-pregnene-3β,20β-diol were the predominant 3β-hydroxy-Δ5 steroids. However, there was a general decrease in the amount of 3β-hydroxy-Δ5 steroids excreted relative to the total steroid excretion. Cortisol metabolites were found in urine from infants of all ages. The principal metabolite was tetrahydrocortisone the excretion of which varied between 100 and 700 μg/24 h. 5β-pregnane-3α,l7α,20α-triol (pregnanetriol) was assayed in each urine sample but only became quantitatively significant after the fourth month of life (20-120 μg/24 h in the later samples).

Combining monolithic and hollow capillary columns under conditions of two-dimensional gas chromatography

2013 ◽  
Vol 87 (8) ◽  
pp. 1374-1379 ◽  
Author(s):  
M. E. Dianov ◽  
A. A. Korolev ◽  
V. E. Shiryaeva ◽  
A. Yu. Kanat’eva ◽  
A. A. Kurganov
Keyword(s):  
Gas Chromatography ◽  
Capillary Columns ◽  
Two Dimensional
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