Gas-Chromatographic Retention Data Using Glycerol as Stationary Phase with Particular Reference to Formaldehyde

1961 ◽  
Vol 33 (8) ◽  
pp. 1126-1127 ◽  
Author(s):  
R. Stevens
Keyword(s):  
Stationary Phase ◽  
Chromatographic Retention ◽  
Retention Data

Dependence of Gas Chromatographic Retention Data of Hydrocarbons on the Film Thickness of the Polydimethylsiloxane Stationary Phase

1994 ◽  
Vol 59 (11) ◽  
pp. 2390-2396
Author(s):  
Ján Krupčík ◽  
Ivan Skačáni ◽  
Eva Benická ◽  
Pat Sandra
Keyword(s):  
Film Thickness ◽  
Stationary Phase ◽  
Aromatic Hydrocarbons ◽  
Active Sites ◽  
Capillary Columns ◽  
Retention Indices ◽  
Chromatographic Retention ◽  
Gas Liquid Chromatography ◽  
Retention Data ◽  
Phase Retention

Kovats indices of cyclic and aromatic hydrocarbons, separated by capillary gas liquid chromatography on polydimethylsiloxane capillary columns, were found to increase with increasing stationary phase film thickness. This effect is explained in terms of adsorption of the stationary phase on the active sites of the inner surface of the capillary column. Since the number of active sites is limited, the overall polarity of the polydimethylsiloxane stationary phase is better defined in columns with thick stationary phase films. Interlaboratory reproducibility of retention indices of cyclic and aromatic hydrocarbons is therefore also better when using capillary columns with thick films of the polydimethylsiloxane stationary phase. Retention data obtained on such thick-film columns are influenced by adsorption of the stationary phase on the column walls to a lesser extent than in columns with thinner films.

scholarly journals A simple TLC and HPTLC method for separation of selected steroid drugs

2013 ◽  
Vol 11 (8) ◽  
pp. 1297-1308 ◽  
Author(s):  
Joanna Nowakowska ◽  
Piotr Pikul ◽  
Krzesimir Ciura ◽  
Jakub Piotrowicz
Keyword(s):  
Stationary Phase ◽  
Mobile Phase ◽  
Stationary Phases ◽  
Principal Component ◽  
Reversed Phase ◽  
Chromatographic Retention ◽  
Retention Data ◽  
Binary Mobile Phases ◽  
Acetone Water ◽  
Steroid Drugs

AbstractChromatographic properties of five steroid drugs: cortisone, hydrocortisone, methylprednisolone, prednisolone and norgestrel have been studied by normal-, reversed-phase and hydrophilic neutral cyano-bonded silica stationary phase with five binary mobile phases (acetonitrile-water, acetonitrile-DMSO, acetonitrile-methanol, acetone-petroleum ether, acetone-water) in which the concentration of organic modifier was varied from 0 to 100% (v/v). This study reports the optimization of steroid hormones separation. Chromatographic retention data and possible retention mechanisms are discussed. Separation abilities of mobile and stationary phases were studied using the principal component analysis method. The best separation of methylprednisolone and prednisolone is with a chromatographic system included silica gel as stationary phase and mixture of acetonitrile and DMSO (10:90 v/v). These two anti-inflammatory drugs can be fast separated from norgestrel when CN is used as stationary phase and acetone and water (40:60 v/v) as mobile phase. The highest values of the parameter Δ(ΔG°) and alfa for cortisone and hydrocortisone was observed in case of using CN as stationary phase and water-acetonitryle (40:60 v/v) as mobile phase.

scholarly journals Gas-Liquid Chromatographic Retention Data for Some isoThiocyanates.

1961 ◽  
Vol 15 ◽  
pp. 1223-1230 ◽  
Author(s):  
Aage Jart ◽  
Knud Engel ◽  
Robert Nilsson ◽  
Gert E. Olsen ◽  
Christian Pedersen ◽  
...  
Keyword(s):  
Chromatographic Retention ◽  
Retention Data ◽  
Liquid Chromatographic

Mosaic increments for predicting the gas chromatographic retention data of the chlorobenzenes

2003 ◽  
Vol 1002 (1-2) ◽  
pp. 155-168 ◽  
Author(s):  
J.M. Santiuste ◽  
J. Harangi ◽  
J.M. Takács
Keyword(s):  
Chromatographic Retention ◽  
Retention Data
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