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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 263 (1973), S. 27-32 
    ISSN: 1618-2650
    Keywords: Esterase ; in Polyacrylamidgel inkludierte Kartoffelesterase ; Elektrophorese, Gel ; Inklusion von Kartoffelesterase in Polycrylamidgel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary An isoenzyme of potato esterase has been entrapped in situ after polyacrylamide (PAA)-electrophoresis, using PAA of different concentrations and crosslinking. Best results in respect to diffusion, flow rates and yield (77%) have been found for a gel containing 6% acrylamide with 6% methylen-bis-acrylamide, penetrating a gel of cyanogum with esterase. The latter is stabilized during polymerization by the gel. Properties of the entrapped enzyme (pHi, K m, MW etc.) have been determined, 100 fold better storage stability is achieved.
    Notes: Zusammenfassung Von den Kartoffelesterasen wurde ein Isoenzym durch Gel-Elektrophorese in Polyacrylamid (PAA) getrennt. Das entsprechende Gelstück mit dem durch das Netzwerk stabilisierten Enzym tränkte man mit AA und Vernetzer (BIS) unterschiedlicher Konzentration und polymerisierte mit Licht das Enzym ein. Die Mischungen AA/BIS sind in einem bestimmten Verhältnis (6∶0,36) optimal., eine Ausbeute von 77% der Anfangsaktivität kann erreicht werden. Einige Eigenschaften (pHi, K m, MG u.ä.) werden beschrieben, insbesondere ist die 100fach bessere Lagerstabilität hervorzuheben.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 20 (1989), S. 251-255 
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: N-Alkylurotropinium polyiodides, UrRIx, with different iodine contents and different sizes of alkyl group were investigated by Raman spectroscopy. The spectra were recorded for wavenumber shifts up to 500 cm-1. It was found that the triiodides, UrRI3, contain a symmetrical linear I3- ion. The pentaiodides, UrRI5, contain no triiodide unit; the anion structure can be described as nearly symmetrical, rectangular L-shaped I5-. An interpretation of the Raman spectra of the heptaiodides, UrRI7, is that the anion corresponds to an I5-. I2 structure. This is the first proof of such a heptaiodide. A review of previously published data on the Raman spectra of polyiodides is also given.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 22 (1991), S. 627-631 
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Solid polybromide-containing functional polymers were obtained from basic anion-exchange resins. The chloride or hydroxide anions of the commercial resins were exchanged by bromide, then dried under anaerobic conditions and allowed to react with a gaseous bromine phase. The formation of linear, slightly asymmetric tribromides was proved by Raman and far-IR spectroscopy. The tribromide spectra are characterized by the symmetrical stretching vibration ν1 at about 160 cm-1 and the antisymmetric stretching vibration ν3 at about 200 cm-1. If the Br2: Br- molar ratio is greater than 1 an additional band could be observed at about 255 cm-1. This band is assigned to the stretching vibration of coordinated bromine. It is shifted in the direction of free bromine at about 300 cm-1 with increasing bromine content in the functional polymers. According to the spectroscopic results, the anion structure in amorphous polybromide-containing functional polymers can be explained by tribromide ions and bromine molecules interacting with the tribromide. The thermal instability of higher polybromides was also proved spectroscopically.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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