Results 161 to 170 of about 306,357 (240)

Monophenolase and catecholase activity of Aspergillus oryzae catechol oxidase: insights from hybrid QM/MM calculations.

Organic and biomolecular chemistry, 2020
Catechol oxidase from Aspergillus oryzae (AoCO4) can not only catalyze oxidation of o-diphenols to o-quinones, but can also catalyze monooxygenation of small phenolics.
Hao Jiang, Wenzhen Lai
semanticscholar   +1 more source

Mono and tri-nuclear cobalt(III) complexes with sterically constrained phenol based N2O2 ligand: Synthesis, structure and catechol oxidase activity

, 2020
Mono and tri- nuclear Co(III) complexes, [Co3(OMe)4L2]ClO4 (1) and [CoL(acac)] (2) have been synthesized using sterically constrained tetradentate ligand N,N/-dimethyl-N,N/-bis(2-hydroxy-3,5-dimethylbenzyl)-ethylenediamine (H2L) with varying reaction ...
Imran Ali, Bikramaditya Mandal, Rajat Saha, Rajarshi Ghosh, Mithun Chandra Majee, Dhrubajyoti Mondal, P. Mitra, Debdas Mandal   +7 more
semanticscholar   +1 more source

Tyrosinase and Catechol Oxidase

Nature, 1938
THE nature of tyrosinase has been under discussion for a very long time. Raper and his school1, Graubard and Nelson2, and Keilin and Mann3 believe it to be a distinct enzyme, different from catechol oxidase. Onslow and Robinson4, McCance5, and Richter6 believe it to be a catechol oxidase plus o-chinone plus dehydrogenase. Kubowitz7, whose work appeared
L. CALIFANO, D. KERTESZ
openaire   +1 more source

A Novel Catechol Oxidase Enzyme Electrode for the Specific Determination of Catechol

Bioscience, Biotechnology, and Biochemistry, 1998
An enzyme electrode for the specific determination of catechol was developed by using catechol oxidase (EC 1.10.3.1) from eggplant (Solanum melangena L.) in combination with a dissolved oxygen probe. Optimization studies of the prepared catechol oxidase enzyme electrode established a phosphate buffer 50 mM at pH 7.0 and 35°C to provide the optimum ...
Dinckaya, E, Akyilmaz, E, Akgol, S, Onal, ST, Zihnioglu, F, Telefoncu, A   +5 more
openaire   +3 more sources

Olive catechol oxidase ‐ changes during fruit development

Journal of the Science of Food and Agriculture, 1977
AbstractChanges were recorded in the subcellular location of catechol oxidase. In the green olive the enzyme is tightly bound to the chloroplast whereas in the black fruit it is essentially soluble. During fruit development, enzyme activity per fruit declines while the o‐diphenolic content rises steadily.
N, Ben-Shalom, V, Kahn, E, Harel, A M, Mayer   +3 more
openaire   +2 more sources

Substrate Binding in Catechol Oxidase Activity:  Biomimetic Approach

Inorganic Chemistry, 2002
A series of dicopper(II) complexes have been investigated as model systems for the catechol oxidase active site enzyme, regarding the binding of catechol substrate in the first step of the catalytic cycle. The [Cu(2)(L(R))(mu-OH)](ClO(4))(2) and [Cu(2)(L(R))(H(2)O)(2)](ClO(4))(3) complexes are based on the L(R) ligands (2,6-bis[(bis(2-pyridylmethyl ...
Torelli, Stephane, Belle, Catherine, Hamman, Sylvain, Pierre, Jean-Louis, Saint-Aman, Eric   +4 more
openaire   +3 more sources

Purification and characterization of catechol oxidase from Tadela (Phoenix dactylifera L.) date fruit.

International Journal of Biological Macromolecules, 2019
Catechol oxidase (PPO) was extracted and purified from Tadela (Phoenix dactylifera L.) date fruit, by a procedure that included (NH4)2SO4 precipitation followed by dialysis, Q-Sepharose bb ion-exchange chromatography and HPLC gel filtration ...
Farouk Benaceur, H. Gouzi, B. Meddah, Aref Neifar, Ali Guergouri   +4 more
semanticscholar   +1 more source

New functional models for catechol oxidases

Inorganica Chimica Acta, 2000
The new dinuclear copper(II) complexes [Cu2(L1)(m-OAc)](ClO4)2·CH3CN (1), [Cu2(L2)(CH3CN)2](ClO4)4·C2H5OH (2), [Cu2(L3)2(CH3CN)2](PF6)2 (3) and [Cu2(L4)2](PF6)2·2CH2Cl2 (4) were prepared with the ligands N,N,N%,N%-tetrakis((N-2-hydroxyethyl)-2-benzimidazolylmethyl)-2-hydroxy-1,3-diaminopropane HL1, N,N,N%,N%-tetrakis (2-methylimidazolyl)-2-hydroxy-1,3 ...
Pavel Gentschev, Niclas Möller, Bernt Krebs   +2 more
openaire   +1 more source

Amperometric catechol biosensor based on polyaniline–polyphenol oxidase

Biosensors and Bioelectronics, 2010
A novel catechol biosensor was described based on the immobilization of polyphenol oxidase (PPO) into polyaniline (PANI), which was easily constructed by direct electropolymerization of aniline in a solution containing ionic liquid, 1-ethyl-3-methylimidazolium ethyl sulfate (EMIES).
Yongyan, Tan, Xiaoxia, Guo, Jinghui, Zhang, Jinqing, Kan   +3 more
openaire   +2 more sources

Catechol Oxidase versus Tyrosinase Classification Revisited by Site-Directed Mutagenesis Studies.

Angewandte Chemie, 2019
Catechol oxidases (COs) and tyrosinases (TYRs) are both polyphenol oxidases (PPOs) that catalyze the oxidation of ortho-diphenols to the corresponding quinones.
Sarah M. Prexler, M. Frassek, B. Moerschbacher, Mareike E Dirks-Hofmeister   +3 more
semanticscholar   +1 more source