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  • 1
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Immobilized capillary columns ; Aqueous solutions ; On-column injection ; Split injection ; Multidimensional separations ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Various methods of gas chromatographic analysis at high resolution and low detection limits in aqueous solutions are described with regard to sampling techniques, column technology, and the application of coupled pre-columns, also including multidimensional methods. Immobilized polyethylene glycol (Carbowax 20 M) columns have also been produced and used successfully.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    ISSN: 0323-7648
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: At first a short review is given with respect to an automatic streaming potential measurement and to the ultrasonic vibration potential method. The ultrasonic vibration method has advantages but the main barrier to a direct application in a mill is the influence of a great electrlyte cocentration. A solution of this problem is of interest. Useful applications of this method in the laboratory are described: basic research with ionic polymers, measurements to the influence of disturbing substances, filler preflocculation.
    Notizen: Zunächst wird der Stand der Entwicklung für eine automatische Strömungspotential-Appartur und eine praxisgerechte Ultraschall-Elektrophorese-Apparatur geschildert. Bei der zweiten Methode erschwert hoher Elektrolytgehalt die Anwendung an einer Papiermaschine. Mögliche Auswege werden noch erprobt. Im Labor hat diese Methode jedoch schon vielfältige Anwendungen ermöglicht, wie z. B. bei Untersuchungen über die Wirkungsweise von Retentionsmitteln, den Einfluß von Störsubstanzen und die Füllstoff-Aktivierung.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 14 (1983), S. 106-117 
    ISSN: 0377-0486
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Coherent anti-Stokes Raman spectra (1700-1100 cm-1) of 7,8-dimethyl-10-tetraacetylisoalloxazine (tetracetylriboflavin) in chloroform and several other solvents of higher polarity and proton availability are reported. Solvent polarity has no influence on either the intensities or frequencies of the Raman modes, whereas the influence of protic solvents is more marked. As well as altering the effective mass of the particular atoms in the isoalloxazine involved, hydrogen bonding is known to change the bond hybridization throughout the entire ring system. A similarly mild electronic perturbation can be produced by changing the methyl substitution on the benzene subnucleus of the isoalloxazine, and this is shown to produce significant changes in the Raman spectrum. Isotopic substitution with 13C and 15N is used to mimic the effective mass changes that would occur on hydrogen bonding. For the model compounds in chloroform, the effect of isotopic substitution on some modes is different from that reported for the same substitution in riboflavin bound to riboflavin binding protein. Frequencies of the prominent bands in all spectra were determined by lineshape analysis. On the basis of these results a tentative interpretation is made of the changes that occur in the Raman spectra of flavins when they bind to flavoproteins.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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