| 1 | Author
| E. Horozova, N. Dimcheva, Z. Jordanova | Requires cookie* | | Title
| Peroxidase-Like Activity of Catalase Immobilized on Carbon Materials  | | | Abstract
| The immobilization of catalase was carried out from enzyme solutions in acid (pH < 3.5) and alkaline (pH > 1 1) medium on two kinds of soot differing by the average size of the particles. Under these conditions the peroxidase-like activity of immobilized catalase in the oxidation of phenol has been studied. The effect of the initial concentration of the substrate on the rate of the process catalysed by catalase immobilized on the soot of finer-grained structure has been studied. The relationships obtained are described by the equation of Mi-chaelis-M enten. The kinetic parameters (the constant of Michaelis -K m, the maximum reac tion rate -Vmax, the rate constant -k and the activation energy -Ea) of the process were calculated. It was found that catalase absorbed on the soot of larger globular particles does not take part in the peroxidase oxidation of phenol. | | |
Reference
| Z. Naturforsch. 53c, 863—8 (1998); received March 3/May 15 1998 | | |
Published
| 1998 | | |
Keywords
| Catalase, Immobilized Enzyme, Carbon Materials, Peroxidase-Like Activity | | |
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| default:Reihe_C/53/ZNC-1998-53c-0863.pdf | | | Identifier
| ZNC-1998-53c-0863 | | | Volume
| 53 | |
4 | Author
| Elena Horozova, Nina Dimcheva, Zinaida Jordanova | Requires cookie* | | Title
| Catalytic Decomposition of 3-Chloroperoxybenzoic Acid by Immobilized Catalase in a Non-Aqueous Medium  | | | Abstract
| Catalytic activities of catalase (C A T) immobilized on graphite -G M Z ™ , soot -"N O R IT " and "PM -100" to mediate decomposition of 3-C l-C 6H 4CO O O H (3-C P B A) in ace-tonitrile have been investigated. Under these conditions, the kinetic param eters K m, k, E a, ^ a x , and Zo were calculated. Conclusions on a probable mechanism of the catalytic process observed were drawn from the calculated values of A G *, AH *, and AS*. A quantitative UV-spectrophotometrical approach was used as the basic analytical tool. The electrochem ical reduction of oxygen generated in enzyme catalysed 3-C P B A decomposition was examined with polarization curves method. | | |
Reference
| Z. Naturforsch. 55c, 55—5 (2000); received February 22/September 28 1999 | | |
Published
| 2000 | | |
Keywords
| Catalase, Immobilized Enzyme, Carbon Materials, Acetonitrile Medium, Catalytic Activity | | |
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| default:Reihe_C/55/ZNC-2000-55c-0055.pdf | | | Identifier
| ZNC-2000-55c-0055 | | | Volume
| 55 | |
5 | Author
| P. Grunwald, W. G. Unßer, K. P. Pfaff, R. K. Rause, K. Lutz | Requires cookie* | | Title
| Zur Beeinflussung der Aktivität von adsorptiv auf eloxierten Aluminiumblechen immobilisierter Urease durch die Anodisier-Bedingungen The Influence o f Anodizing Conditions on the Activity o f Urease Immobilized to Anodized Sheet A lum inium  | | | Abstract
| The activity of urease immobilized by adsorption on anodized sheet aluminium strongly depends on the method chosen for preparation of these carriers. If oxalic acid is applied as electrolyte, only the anodizing temperature significantly influences the activity of the prepara tions. In case of the well-known GS process, however, the activity is not only affected by the temperature, but also by other conditions of anodizing, for example the current density and the electrolyte concentration. For both methods the correlation between the topography of the carrier surfaces and the activity of enzyme immobilized to the surface is described. | | |
Reference
| Z. Naturforsch. 35c, 819—823 (1980); eingegangen am 15. Februar/6. Mai 1980 | | |
Published
| 1980 | | |
Keywords
| Immobilized Enzymes, Urease, Anodized Sheet Aluminium, Surface Structure, Scanning Elec tron Microscopy | | |
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| default:Reihe_C/35/ZNC-1980-35c-0819.pdf | | | Identifier
| ZNC-1980-35c-0819 | | | Volume
| 35 | |
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