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  • Gas chromatography  (2)
  • ESCA  (1)
  • Polymethylmethacrylate  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Toxicity of polymethylmethacrylate thermodegradation products (1984)
    Springer
    Archives of toxicology 55 (1984), S. 137-142 
    Details
    ISSN: 1432-0738
    Keywords: Polymethylmethacrylate ; Methyl methacrylate ; Brain ; Lung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Polymethylmethacrylate was thermally degraded in air at 300° C and the volatile decomposition products studied with gas chromatography-mass spectrometry. The main product was monomeric methacrylate, although many other compounds existed among the products. Electron spin resonance spectroscopy revealed the presence of free radicals. Wistar rats were exposed to the fumes of the plastic (300° C) and their lungs and brain studied for biochemical effects. In the lung, the activity of 7-ethoxycoumarin O-deethylase decreased and an initial inhibition of glutathione peroxidase and superoxide dismutase was observed. The contents of reduced nonprotein sulfhydryl groups were decreased in the lung and brain. The exposures enhanced the activities of acetylcholine esterase, creatine kinase and NADPH-diaphorase in the brain. Scanning electron microscopy of the exposed lungs showed disorganization of ciliated cells, and the epithelial serous cells (Clara cells) were damaged.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00346053
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis of volatile organic compounds in polymers by dynamic headspace and gas chromatography/mass spectrometry (1984)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 185-190 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary columns ; Mass spectrometry ; Dynamic headspace ; Deans switching ; Cold trap ; Reinjection ; Polymers ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An experimental method for the analysis of volatile organic compounds in polymers is described. The technique involves dynamic headspace sampling, collection, and concentration of the volatiles in a cold trap, followed by capillary column gas chromatography/mass spectometry. Flow switching is carried out by the Deans switching technique. Four technical polymers used as pharmaceutical packaging materials have been analyzed in order to demonstrate the method.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240070403
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Evaluation of a rotary valve/cold trap/reinjection system for capillary columns (1982)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 5 (1982), S. 236-244 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary columns ; Rotary valve ; Cold trap ; Reinjection ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This paper describes a cold trap/reinjection system for capillary columns which utilizes a flow switching rotary valve. Sample enrichment is performed in a liquid nitrogen-cooled glass trap attached to the valve. Evaporation of enriched compounds is carried out with the aid of an electric heating coil. Parameters such as cryogenic trapping efficiency, reinjection rates, transference of sample, and adsorption, as well as overall performance, are examined. In addition, a comparison is made between the cold trap/reinjection technique and injection with a gas-tight syringe.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240050503
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Surface Analysis of Stationary Phases for Solid-phase Extraction, using ESCA and SIMS in Combination with Multivariate Analysis (1997)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 25 (1997), S. 105-110 
    Details
    ISSN: 0142-2421
    Keywords: stationary phases ; ESCA ; SIMS ; multivariate ; PCA ; PLS ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Stationary phases for solid-phase extraction (SPE) were analysed by ESCA and SIMS in combination with multivariate analysis (MVA). The SPEs were endcapped and non-endcapped octadodecyl-bonded silica spheres of various carbon loadings (CL). The SIMS survey spectra and ESCA survey, detail and valence band spectra were recorded. In order to explore the potential of using MVA in combination with surface analysis, and to improve and simplify extraction of information from the acquired spectra, principal components analysis (PCA) and partial least squares (PLS) were applied. Various methods for normalization of spectra and variables were tested to improve separation between groups in the PCA score plots. With appropriate normalization, the different types of SPEs formed distinguishable clusters in the score plots from PCA on all types of spectra recorded. The clusters were ordered in correlation to CL. From the PCA performed on the SIMS spectra it was possible to extract information regarding both CL and endcapping status of the samples. The endcapping status could be predicted successfully using the PLS model built from the SIMS spectra. The weights of the PLS model could be used to identify mass fragments typical for the sample surfaces, and the fragments identified correlated well to the different surface structures of the samples. © 1997 by John Wiley & Sons, Ltd.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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