Results 161 to 170 of about 208,364 (208)

Capillary gas chromatography-mass spectrometry of ecdysteroids

Journal of Chromatography A, 1987
Fully trimethylsilylated ecdysteroids have been analysed by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS) using flexible fused-silica capillary columns. Best results were obtained using columns coated with cross-bonded apolar (OV-1 type) stationary phases.
R P, Evershed, J G, Mercer, H H, Rees
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On‐line multidimensional chromatography using packed capillary liquid chromatography and capillary gas chromatography

Journal of High Resolution Chromatography, 1985
AbstractThe introduction of selected fractions from a liquid chromatograph into a gas chromatograph has been described; however, analyses were performed by off‐line experiments requiring collection and reinjection of the separate fractions or by on‐line procedures where disadvantageously, only a fraction of the separated peak or a well resolved ...
H. J. Cortes, C. D. Pfeiffer, B. E. Richter   +2 more
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Ammonia as carrier gas in capillary gas–liquid chromatography

Journal of Chromatography A, 2001
Influence of helium and ammonia as carrier gases on retention of neutral solutes on polyethylene glycol has been studied theoretically and experimentally. It was shown that the influence of ammonia on the retention varied significantly depending on the solute's nature.
V G, Berezkin, V R, Alishoev, A A, Korolev, I V, Malyukova   +3 more
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Potentials of capillary gas chromatography in toxicology today

Zeitschrift f�r Rechtsmedizin, 1984
The usefulness, the applicability and the limitations of capillary gas chromatography in various types of toxicological analysis were discussed. Technical parameters of capillary gas chromatography, such as type of injector, type of column with regard to material, size, and stationary phase were assessed in view of the requirements of toxicological ...
BOGUSZ, M, DEZEEUW, RA, FRANKE, JP
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Fast Capillary Gas Chromatography: Comparison of Different Approaches

Journal of High Resolution Chromatography, 1998
Savings in analysis time in capillary GC have always been an important issue for chromatographers since the introduction of capillary columns by Golay in 1958. In laboratories where gas chromatographic techniques are routinely applied as an analytical technique, every reduction of analysis time, without significant loss of resolution, can be translated
Lieshout, van, H.P.M., Derks, R.J.S., Janssen, J.G.M., Cramers, C.A.M.G.   +3 more
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Packed Capillary Columns in Gas Chromatography

Russian Chemical Reviews, 1978
Data on the preparation, properties, and applications of packed capillary columns are surveyed and analysed. The characteristics of chromatographic separation in columns of this type are discussed, the principal ways of improving the efficiency of packed capillary columns are considered, and the regions where they can be employed in practice are ...
Viktor G Berezkin, L A Shkolina, V N Lipavskii, A A Serdan   +3 more
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Capillary packed columns in gas chromatography

Journal of Chromatography A, 1977
Abstract The preparation, properties and utilization of capillary packed columns are reviewed. The specific features of chromatographic separations on this type of column are discussed, principal methods for improving their efficiency are considered and the range of practical applicationis indicated.
V.G. Berezkin, L.A. Shkolina, V.N. Lipavsky, A.A. Serdan, V.A. Barnov   +4 more
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Capillary gas chromatography

Journal of Chromatography A, 1996
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Capillary Gas Chromatography for Drug Analysis

Journal of Analytical Toxicology, 1979
Capillary gas chromatography has not been commonly used in toxicology. The high number of theoretical plates and the Inertness ol the glass system are advantages of this technique. The present paper describes the application of this technique to identification and quantltation of methyprylon and its metabolltes in blood, urine, and tissues on a ...
M. Van Boven, I. Sunshine
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Hyphenated high-performance liquid chromatography—capillary gas chromatography

Journal of Chromatography A, 1992
Abstract Coupled chromatographic techniques involve hyphenation at the front end of the main separation step and will increasingly be required for laboratories to carry out routine analyses of increasing complexity in the future. Thousands of samples have been analysed by automated liquid chromatography—gas chromatography (LC—GC), saving around 15 ...
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