Increased resistance to mass transfer in capillary columns with unevenly coated stationary phases

1987 ◽  
Vol 36 (12) ◽  
pp. 2557-2561
Author(s):  
A. V. Vasil'ev ◽  
R. B. Golovnya
Keyword(s):  
Mass Transfer ◽  
Stationary Phases ◽  
Capillary Columns

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.

Wide-Bore Capillary Gas Chromatographic Determination of Organophosphorus Pesticide Residues in Foods: Interlaboratory Trial

1994 ◽  
Vol 77 (1) ◽  
pp. 92-101
Author(s):  
Charles H Parfitt
Keyword(s):  
Pesticide Residues ◽  
Stationary Phases ◽  
Packed Column ◽  
Capillary Columns ◽  
Packed Columns ◽  
Detector Response ◽  
Official Method ◽  
Methyl Silicone ◽  
Interlaboratory Trial

Abstract Wide-Bore capillary columns are often used as alternatives to traditionally packed columns for gas chromatographic (GC) determination of pesticide residues in foods. Fused silica columns with cross-linked, bonded stationary phases are reproducible, rugged, and easy to use and are substantially more inert than their packed column equivalents. An interlaboratory trial was conducted in 5 U.S. Food and Drug Administration laboratories to determine the practicability of using isothermal wide-bore capillary GC as an alternative to the packed column GC systems used in AOAC Official Methods for determining pesticide residues in foods. Two wide-bore capillary columns with flame photometric detection were evaluated with respect to the following: linearity of detector response; repeatability of response for equal and unequal injection volumes of standard solutions; accuracy of quantitating pesticides in food extracts when the injection volumes or analyte concentrations of the standard solution and the food extract are different; recoveries of 23 pesticides from 5 fortified food extracts, calculated from both duplicate and single injections; and relative retention times. Before shipment, food extracts supplied to participants were fortified with pesticides after preparation and extraction of the foods by Official Method 985.22. The performance of wide-bore capillary columns with cross-linked bonded methyl silicone and methyl phenyl silicone stationary phases was equal or superior to that of the packed columns specified in the Official Method.

High-Resolution Gas-Chromatographic Analysis of the Volatile Constituents of Body Fluids, with Use of Glass Capillary Columns

1974 ◽  
Vol 20 (9) ◽  
pp. 1105-1110 ◽  
Author(s):  
Milos Novotny ◽  
Michael L McConnell ◽  
Milton L Lee ◽  
Raleigh Farlow
Keyword(s):  
Human Urine ◽  
Chromatographic Analysis ◽  
High Efficiency ◽  
Stationary Phases ◽  
Capillary Columns ◽  
Porous Polymer ◽  
Glass Capillary ◽  
Volatile Constituents ◽  
Glass Capillary Columns ◽  
Glass Columns

Abstract Trace volatile constituents of human urine, serum, and cerebrospinal fluid were concentrated on a porous polymer precolumn, and resolved with high-efficiency glass capillary columns. Thin-film glass columns facilitate effective resolution of underivatized compounds within the volatility range up to docosane in relatively short analysis times. Glass capillary columns coated with stationary phases of different polarity were used. Recorded volatile metabolic profiles of human urine are altered after the sample is treated with β-glucuronidase and sulphatase.

Comparison of the mass transfer in totally porous and superficially porous stationary phases in liquid chromatography

2010 ◽  
Vol 397 (3) ◽  
pp. 1307-1314 ◽  
Author(s):  
Ibolya Kiss ◽  
Ivett Bacskay ◽  
Ferenc Kilár ◽  
Attila Felinger
Keyword(s):  
Mass Transfer ◽  
Liquid Chromatography ◽  
Stationary Phases
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