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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 25 (1983), S. 1873-1895 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: An immobilized Penicillin-V-acylase (commercial name, Novozym 217) with high specificity for the phenoxyacetyl-(V)- side chain was investigated in a recycle reactor and in a batch reactor to find the enzymatic reaction rate as a function of conversion, x, substrate concentration, cA0 and pH. The reaction rate depends strongly on pH, and both products, phenoxy-acetic acid and 6-APA, inhibit the reaction. Nonspecific side reactions amount to only a few per cent when cA0 〈150mM and pH& gt; 6.5. The effectiveness factor for commercial-size particles is found to be about 0.65, and a value of 1.3mM is obtained for the equilibrium constant, Keq, of the deacylation reaction. A kinetic model for the deacylation process which includes the effect of pH and of the reverse (acylation) reaction is proposed. Rate data for particles of different size are fitted to the nonlinear model. Five kinetic parameters and an effective diffusivity for the immobilized enzyme particles are determined.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Manganese phthalocyanines with high electron numberManganese(II)-phthalocyanine can be reduced in tetrahydrofuran with lithium under addition of some stilbene according with the general scheme [MnPc] + n ⊖ → [MnPc]n⊖ in five steps. The preparation of the formed anionic complexes as tetrahydrofuran containing lithium salts Lin[MnPc] · xTHF is described, and their electronic structure is discussed on the basis of simple LCAO—MO theory.
    Notes: Mangan(II)-phthalocyanin läßt sich in Tetrahydrofuran mit Lithium unter Zusatz von etwas Stilben entsprechend dem allgemeinen Schema [MnPc] + n⊖ → [MnPc]n⊖; fünfstufig reduzieren. Es wird die Reindarstellung der gebildeten anionischen Komplexe als tetrahydrofuranhaltige Lithiumsalze Lin[MnPc] · xTHF beschrieben und ihre Elektronenstruktur auf der Grundlage der einfachen LCAO—MO-Theorie diskutiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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