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Digitale Medien

Supercritical ammonia as mobile phase in capillary chromatography (1987)

Kuei, J. C. ; Markides, K. E. ; Lee, M. L.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 10 (1987), S. 257-262

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ISSN: 0935-6304

Schlagwort(e): Supercritical fluid chromatography, SFC ; Capillary columns ; Ammonia ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Instrumentation was assembled that allows the use of supercritical ammonia as mobile phase in capillary supercritical fluid chromatography. Several modifications of the typical chromatographic system were necessary, especially with respect to injection and detection. In addition, the stabilities of various polysiloxane stationary phases were studied. The chromatography of polarizable and polar basic materials was demonstrated using a nonpolar polysiloxane stationary phase.

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240100509

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Digitale Medien

Polarizable biphenyl polysiloxane stationary phase for capillary column gas chromatography (1984)

Kuei, J. C. ; Shelton, J. I. ; Castle, L. W. ; [weitere]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 7 (1984), S. 13-18

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ISSN: 0935-6304

Schlagwort(e): Gas chromatography ; Capillary columns ; Biphenyl polysiloxane ; Stationary phase ; Polarizable phase ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: A crosslinkable biphenylmethylpolysiloxane stationary phase was synthesized for capillary column gas chromatography and compared with methyl, phenyl, and cyanopropyl polysiloxane stationary phases for the separation of isomeric polycyclic aromatic compounds. While the new phase gave similar separations of nonpolar isomers when compared to the nonpolar phases, separations of polar isomers were greatly improved because of the induced polarity of the biphenyl group of the stationary phase by the solute molecules. This polarizable stationary phase offers a unique selectivity which is not available in other stationary phases.

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jhrc.1240070103

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

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

Weinheim : Wiley-Blackwell

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

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ISSN: 0935-6304

Schlagwort(e): Free radical crosslinking ; Capillary gas chromatography ; Azo compounds ; Nonextractable Polysiloxane stationary phases ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: 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.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

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

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