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Direct measurement of mass fragmentograms for eluents from a micro-liquid chromatograph using an improved nebulizing interface (1980)

Yoshida, Yu ; Yoshida, Hiromasa ; Tsuge, Shin ; [et al.]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 3 (1980), S. 16-20

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ISSN: 0935-6304

Keywords: LC/MS interface ; Nebulizing interface ; Micro-LC ; CI-MS ; Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: An improved vacuum nebulizing interface with a very short counter nozzle was developed for direct coupling of a micro-LC and a quadrupole MS with CI-chamber. With the LC-MS system using the nebulizing interface, it became possible to take mass fragmentograms for various less volatile compounds such as glutamic acid, steroids, aromatic amines and chlorine-containing insecticides.

Additional Material: 7 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jhrc.1240030105

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Study on retention behavior of cyclic siloxanes by high resolution pyrolysis-gas chromatography with a fused silica capillary column (1990)

Fujimoto, Shinji ; Ohtani, Hajime ; Yamagiwa, Katsuya ; [et al.]

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 13 (1990), S. 397-404

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ISSN: 0935-6304

Keywords: Capillary gas chromatography ; Cyclic siloxanes ; Pyrolysis gas chromatography ; Retention behavior of oligosiloxanes ; Thermal degradation of polysiloxanes ; Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: The general gas chromatographic retention behavior of cyclic methylsiloxanes partially substituted with phenyl or 2-cyanoethyl groups has been systematically studied, with pyrolysis-gas chromatography being utilized to form the cyclic siloxanes from the corresponding polysiloxanes at a temperature of 600°C. Kovats retention indices (KI) were determined for the cyclic siloxanes by use of the retention data of the pyrolyzates from polyethylene as standards. The effect of phenyl and 2-cyanoethyl substituents in the cyclic siloxanes on retention behavior has also been considered.

Additional Material: 8 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jhrc.1240130603

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Pyrolysis - capillary gas chromatography combined with on-line alkylation for the compositional analysis of liquid crystalline aromatic polyesters (1991)

Ohtani, Hajime ; Fujii, Ryuichi ; Tsuge, Shin

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 14 (1991), S. 388-391

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ISSN: 0935-6304

Keywords: Pyrolysis - gas chromatography ; Liquid crystalline polyesters ; On-line alkylation ; Compositional analysis ; Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Pyrolysis-capillary gas chromatography combined with on-line alkylation has been employed for compositional analysis of liquid crystalline aromatic polyesters (LCPs) based on p- hydroxybenzoic acid. The fundamental conditions were examined using an LCP prepared from p-hydroxybenzoic acid, terephthalic acid, and 4,4′-biphenol and every constituent of a sample weighing ca. 50 μg was almost quantitatively recovered as its dimethyl derivative in the pyrogram obtained following pyrolysis at 400°C in the presence of 1 μl of 25% tetramethyl-ammonium hydroxide in methanol. The compositions of a variety of terpolyesters and LCPs containing isophthalic acid or 2-hydroxy-6-naphthoic acid units have been precisely deter-mined by pyrolysis-methylation GC.

Additional Material: 5 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jhrc.1240140607

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