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2000 (1)
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1Author    E. Horozova, N. Dimcheva, Z. JordanovaRequires 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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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0863.pdf 
 Identifier    ZNC-1998-53c-0863 
 Volume    53 
2Author    E. Horozova, N. Dimcheva, Z. JordanovaRequires cookie*
 Title    Enzymatic and Electrochemical Reactions of Xanthine Oxidase Immobilized on Carbon Materials  
 Abstract    A n optimum way o f immobilizing xanthine oxidase on graphite was found where a redox transformation of the enzyme was observed. The nature o f the redox maxima was hypothe­ sized on the basis of the dependence of the half-wave potential (E p/2) on the pH of the solution. The enzymatic activity of xanthine oxidase adsorbed on two kinds o f soot was studied by the oxidation o f xanthine. The kinetic and activation parameters of the enzyme reaction were determined. 
  Reference    Z. Naturforsch. 52c, 159—164 (1997); received November ll/ 
  Published    1997 
  Keywords    Xanthine Oxidase, Immobilized Enzyme, Carbon Materials, Electrochemical and Catalytic Activity 
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 TEI-XML for    default:Reihe_C/52/ZNC-1997-52c-0159.pdf 
 Identifier    ZNC-1997-52c-0159 
 Volume    52 
3Author    E. Horozova, N. Dimcheva, Z. JordanovaRequires cookie*
 Title    Adsorption, Catalytic and Electrochemical Activity o f Catalase Immobilized on Carbon Materials  
 Abstract    The adsorption of catalase on two types of soot differing in their structure has been charac­ terized. The adsorption of this enzyme obeys the Tyomkin adsorption isotherm. It has been established that the catalase immobilized on soot and graphite takes part in the electrochem i­ cal oxidation of phenol. The enzyme activity of catalase immobilized on both types of soot was studied on the decomposition of hydrogen peroxide. The kinetic and activation param e­ ters of the processes studied have been determined. 
  Reference    Z. Naturforsch. 52c, 639—644 (1997); received May 5/July 3 1997 
  Published    1997 
  Keywords    Catalase, Immobilized Enzyme, Carbon Materials, Electrochemical and Biocatalytic Activity 
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 TEI-XML for    default:Reihe_C/52/ZNC-1997-52c-0639.pdf 
 Identifier    ZNC-1997-52c-0639 
 Volume    52 
4Author    Elena Horozova, Nina Dimcheva, Zinaida JordanovaRequires 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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 TEI-XML for    default:Reihe_C/55/ZNC-2000-55c-0055.pdf 
 Identifier    ZNC-2000-55c-0055 
 Volume    55