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'Immobilized Enzyme' in keywords Facet   Publication Year 2000  [X]
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2000[X]
1Author    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 
2Author    ElenaG. Horozova, NinaD. Dimcheva, ZinaidaJ. JordanovaRequires cookie*
 Title    Study of Xanthine Oxidase Immobilized Electrode Based on Modified Graphite  
 Abstract    Xanthine oxidase (E . C. 1.2.3.2) was immobilized by adsorption on electrochem ically modi­ fied graphite plate to obtain an enzyme electrode. The current of the enzyme electrode in substrate (xanthine) solutions was found to be a result of the electrooxidation of H 20 2 gener­ ated in the enzyme layer. The linearity of the amperometric signal was up to a substrate concentration of 65 ^im at 0.6 V (vs. Ag/A gCl). The response time was 2 minutes. The enzyme electrode preserves 80% of its initial activity after perature. 
  Reference    Z. Naturforsch. 55c, 60—6 (2000); received O ctober 5/Novem ber 10 1999 
  Published    2000 
  Keywords    Xanthine Oxidase, Immobilized Enzyme, Modified Graphite, Hydrogen Peroxide, Enzym e Electrode 
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 TEI-XML for    default:Reihe_C/55/ZNC-2000-55c-0060.pdf 
 Identifier    ZNC-2000-55c-0060 
 Volume    55