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Derivatives of cholesterol cinnamate: A comparison of the separations of geometrical isomers when used as gas chromatographic stationary phasesMention of a commercial or proprietary product does not constitute an endorsement by the USDA. (1983)

Heath, R. R. ; Doolittle, R. E.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 6 (1983), S. 16-19

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ISSN: 0935-6304

Keywords: Capillary gas chromatography ; Liquid crystal stationary phases ; para-Substituted cholesterol cinnamate ; Geometrical isomers (insect pheromones) ; Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Four para-substituted cholesterol cinnamates were synthesized and evaluated for utility as gas chromatograph (GC) liquid crystal stationary phases. The capability of the phases to separate olefinic geometrical isomers was found to be dependent on the position of the olefinic bond. When unsaturation occurred at positions four carbons or greater from the terminal methyl of the compounds investigated, the relative ability of the phases to separate geometrical isomers was p-Cl 〉 p-Me 〉 cholesterol cinnamate 〉 p-MeO derivative 〉 p-NO2. When unsaturation occurred at positions four carbons or less from the terminal methyl the relative ability of the para-derivatives of cholesterol cinnamate to separate geometrical isomers was reversed.

Additional Material: 4 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jhrc.1240060104

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Technique for accurate measurement of capillary lengths and diameters (1983)

Guthrie, E. J. ; Jorgenson, J. W. ; Knecht, L. A. ; [et al.]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 6 (1983), S. 566-567

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ISSN: 0935-6304

Keywords: Capillary ; Capillary liquid chromatography ; Capillary gas chromatography ; Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jhrc.1240061007

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Increased sensitivity and accuracy of steroid hormone determinations with capillary GC and flame thermionic detection (1983)

Vanluchene, E. ; Vandekerckhove, D.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 6 (1983), S. 686-689

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ISSN: 0935-6304

Keywords: Capillary gas chromatography ; Steroid hormones ; Selective detection (NPD) ; Effluent splitting ; Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 4 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jhrc.1240061211

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Purification of OV-17 by supercritical fluid fractionation for fused silica capillary gas chromatographyPresented in part at Capillary Chromatography 1982, October 6, 1982, Tarrytown, New York, USA. (1983)

Barry, E. F. ; Ferioli, P. ; Hubball, J. A.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 6 (1983), S. 172-177

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ISSN: 0935-6304

Keywords: Capillary gas chromatography ; Supercritical fluid extraction ; Temperature stability of stationary phase OV-17 ; Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Commercially available OV-17 was partitioned into a low and a higher molecular weight fraction by supercritical fluid extraction with carbon dioxide. This higher molecular weight fraction is more thermally stable than the original OV-17 due to its more viscous and gum-like nature. Based on the growing evidence in the literature that a deactivating agent for fused silica open tubular columns should be compatible with the stationary phase, a precoat of 1,3,5-trimethyl-1,3,5-triphenylcyclotrisiloxane was applied prior to the static coating of high molecular weight OV-17. Fused silica OV-17 columns prepared in this fashion are stable up to 300°C.

Additional Material: 8 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jhrc.1240060402

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Azo compounds for free radical crosslinking of polysiloxane stationary phases (1983)

Richter, B. E. ; Kuei, J. C. ; Park, N. J. ; [et al.]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 6 (1983), S. 371-374

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ISSN: 0935-6304

Keywords: Free radical crosslinking ; Capillary gas chromatography ; Azo compounds ; Nonextractable Polysiloxane stationary phases ; Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: There has been much effort spent in recent years developing the technology for free radical crosslinking of polysiloxane polymers to prepare capillary columns coated with thermally stable and nonextractable stationary phases. Organic peroxides have been used extensively as the free radical initiators for the in situ polymerization of the stationary phases. However, these peroxides adversely affect the phase polarity and column activity. Seven azo compounds were studied for crosslinking efficiency. Azo compounds can be used as free radical initiators to prepare nonextractable stationary phases without the adverse effects caused by peroxides.

Additional Material: 1 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jhrc.1240060705

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Determination of fatty acid anilides in contaminated cooking oils using high resolution capillary gas chromatography (1983)

Bailey, E. ; Peal, J. ; Brooks, A. G. F.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 6 (1983), S. 452-453

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ISSN: 0935-6304

Keywords: Capillary gas chromatography ; Fatty acid anilides ; Contaminated cooking oils ; Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 1 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jhrc.1240060814

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Injection temperature effects using On-column and split sampling in capillary gas chromatography (1983)

Wang, F.-S. ; Shanfield, H. ; Zlatkis, A.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 6 (1983), S. 471-479

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ISSN: 0935-6304

Keywords: Capillary gas chromatography ; On-column injection ; Split sampling ; Temperature control ; Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: The effect of sample injection temperature on quantitation is examined for on-column and conventional split modes of sampling in capillary gas chromatography. Discrimination effects can be observed even with on-column injection if the injection temperature is too far above the boiling point of the solvent (or that of a major low boiling constituent(. This is attributed to higher boiling components being left behind in the syringe needle, and a set of simulation experiments are described to illustrate this effect. Various discrimination patterns using conventional split injection were observed, depending on temperature of injection. Apart from syringe needle effects, discrimination is probably due to the preferential venting of higher boiling components as liquid sample droplets, which can have a lifetime greater than the time of transit to the splitter. With such a two-phase system, involving variable droplet size, the flow distribution in the splitter will be critical to uniform sampling. The use of combination on-column/split sampling, with the appropriate temperature control to provide sample uniformity to the splitter is discussed as an advantageous alternative to conventional split sampling.

Additional Material: 7 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jhrc.1240060903

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