Results 171 to 180 of about 306,357 (240)

Oxidase‐Like Nanozyme Activity of Ultrathin Copper Metal–Organic Framework Nanosheets With High Specificity for Catechol Oxidation

ChemCatChem
In nature, catechol oxidase catalyzes the oxidation of o‐diphenol to o‐quinone to produce a series of highly important polyphenolic natural products.
Ajit Kumar Singh, D. Sharma, Devesh Kumar Singh, Sonu Sarraf, A. Basu, Vellaichamy Ganesan, Avishek Saha, Arindam Indra   +7 more
semanticscholar   +1 more source

Catechol oxidase of red delicious apple peel

Phytochemistry, 1972
Abstract Catechol oxidase has been solubilized from the particulate fraction of apple peel using Triton X-100, dialysis and butanol extraction. The partially purified enzyme retained activity during lyophilization in the presence of mercaptobenzothiazole. The substrate specificity and pH optima of the enzyme are reported.
David A. Stelzig, S. Akhtar, S. Ribeiro
openaire   +1 more source

Synthesis and structure of a cobalt(III) complex containing pendant Schiff base ligand: Exploration of its catechol oxidase and phenoxazinone synthase like activity

Inorganica Chimica Acta, 2018
A new cobalt(III) complex, [Co(L-κ-N,N,O)(L-κ-N,O)(NCS)]·0.5H 2 O, with a pendant Schiff base {HL = 2((2-morpholinoethylimino)methyl)-6-ethoxyphenol} has been synthesized and characterized by elemental and several spectral analyses.
Kousik Ghosh, M. Drew, S. Chattopadhyay
semanticscholar   +1 more source

Catechol oxidase and phenoxazinone synthase mimicking activities of mononuclear Fe(III) and Co(III) complexes of amino-bis(phenolate)-based mixed ligands: Synthesis, spectral and electrochemical studies

Inorganica Chimica Acta, 2019
A new class of aminophenol ligands, bis(5-(tert-butyl)-2-hydroxybenzyl)glycine (H3L1) and bis(2-hydroxy-5-methylbenzyl)glycine (H3L2) were synthesized by the Mannich reaction.
S. Indira, G. Vinoth, M. Bharathi, S. Bharathi, A. K. Rahiman, K. Bharathi   +5 more
semanticscholar   +1 more source

The catalytic cycle of catechol oxidase

JBIC Journal of Biological Inorganic Chemistry, 2004
Hybrid density functional theory with the B3LYP functional has been used to investigate the catalytic mechanism of catechol oxidase. Catechol oxidase belongs to a class of enzymes that has a copper dimer with histidine ligands at the active site. Another member of this class is tyrosinase, which has been studied by similar methods previously.
openaire   +2 more sources

Multiple forms of Vitis vinifera catechol oxidase

Phytochemistry, 1973
Abstract Grape catechol oxidase shows multiple forms upon ion exchange chromatography, acrylamide gel electrophoresis and gel filtration. Conversion of some bands into others, which occurs during isolation and storage, is enhanced by dilution and by treatment with urea or acid pH.
Eitan Harel, Alfred M. Mayer, Eliakim Lehman   +2 more
openaire   +1 more source

Synthesis and structural characterization of a cobalt(III) complex with an (N,S,O) donor Schiff base ligand: Catechol oxidase and phenoxazinone synthase activities

Polyhedron, 2018
A mononuclear Co(III) complex [CoL2]Cl (1) [HL = (E)-2-((3-(2-hydroxyethylthio)propylimino)methyl)phenol] was synthesized and its X-ray crystallographic characterization revealed a distorted octahedral geometry around the metal centre.
A. K. Ghosh, C. Purohit, Rajarshi Ghosh
semanticscholar   +1 more source

Theoretical study of the catalytic mechanism of catechol oxidase

JBIC Journal of Biological Inorganic Chemistry, 2007
The mechanism for the oxidation of catechol by catechol oxidase has been studied using B3LYP hybrid density functional theory. On the basis of the X-ray structure of the enzyme, the molecular system investigated includes the first-shell protein ligands of the two metal centers as well as the second-shell ligand Cys92.
Mireia, Güell, Per E M, Siegbahn
openaire   +2 more sources

Catechol oxidases, endogenous substrates and browning in developing apples

Journal of the Science of Food and Agriculture, 1966
AbstractThe content of o‐diphenols and catechol oxidase activity was followed in developing apples from fruit set to harvest time. Afterwards their level drops, apparently due to conversion to other compounds and cessation of synthesis. Catechol oxidase activity shows a peak after that occurring in content of o‐diphenols.
E, Harel, A M, Mayer, Y, Shain
openaire   +2 more sources

Unraveling Substrate Specificity and Catalytic Promiscuity of Aspergillus oryzae Catechol Oxidase

ChemBioChem, 2018
Catechol oxidases and tyrosinases are coupled binuclear copper enzymes that oxidize various o‐diphenolic compounds to corresponding o‐quinones. Tyrosinases have an additional monooxygenation ability to hydroxylate monophenol to o‐diphenol.
Leena Penttinen, Chiara Rutanen, J. Jänis, J. Rouvinen, N. Hakulinen   +4 more
semanticscholar   +1 more source