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Selective sensing of catechol based on a fluorescent nanozyme with catechol oxidase activity
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, 2023Nanozymes, an unusual category of nanomaterials possessing enzymatic properties, and have generated considerable interest regarding their application feasibilities on several important fronts. In the present work, an innovative sensing device for catechol was established ground on a fluorescent nanozyme (Cu-BDC-NH2) that exhibited catechol oxidase ...
Yongxin Li
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The catalytic cycle of catechol oxidase
Journal of Biological Inorganic Chemistry, 2004Hybrid 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.
Per E M Siegbahn
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Amperometric catechol biosensor based on polyaniline–polyphenol oxidase
Biosensors and Bioelectronics, 2010A 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).
Jinghui Zhang, Jinqing Kan
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Tyrosinase versus Catechol Oxidase: One Asparagine Makes the Difference
Angewandte Chemie - International Edition, 2016AbstractTyrosinases mediate the ortho‐hydroxylation and two‐electron oxidation of monophenols to ortho‐quinones. Catechol oxidases only catalyze the oxidation of diphenols. Although it is of significant interest, the origin of the functional discrimination between tyrosinases and catechol oxidases has been unclear. Recently, it has been postulated that
Felix Tuczek, Heinz Decker
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Evidence for conformational changes in grape catechol oxidase
Phytochemistry, 1972Abstract A rapid, 4–10-fold, activation of grape catechol oxidase by a short exposure to acid pH or urea is demonstrated. Activation was either reversible or irreversible, depending on length and type of treatment. The change in activity of the enzyme is due primarily to an increase in V max , while the affinity for 4-methylcatechol decreases and ...
A M Mayer, E Harel
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Platinum Nanoparticles: Efficient and Stable Catechol Oxidase Mimetics
ACS Applied Materials & Interfaces, 2015Although enzyme-like nanomaterials have been extensively investigated over the past decade, most research has focused on the peroxidase-like, catalase-like, or SOD-like activity of these nanomaterials. Identifying nanomaterials having oxidase-like activities has received less attention. In this study, we demonstrate that platinum nanoparticles (Pt NPs)
Yi Liu, Haohao Wu, Yu Chong
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Multiple forms of Vitis vinifera catechol oxidase
Phytochemistry, 1973Abstract 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
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ChemCatChem, 2013
Enzymatic mimics are designed by using small molecules to impart insight into the mechanistic pathways of the enzymes and to generate catalysts that could be as efficient as the enzyme itself. Among the copper-based polyphenol oxidase enzymes, the copper(II)-containing enzyme catechol oxidase catalyses exclusively the oxidation of ortho-diphenols to ...
Suman Kr Dey, Arindam Mukherjee
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Enzymatic mimics are designed by using small molecules to impart insight into the mechanistic pathways of the enzymes and to generate catalysts that could be as efficient as the enzyme itself. Among the copper-based polyphenol oxidase enzymes, the copper(II)-containing enzyme catechol oxidase catalyses exclusively the oxidation of ortho-diphenols to ...
Suman Kr Dey, Arindam Mukherjee
exaly +2 more sources
Oxidation of Catechol by Tea-Oxidase
Nature, 1950DURING the enzymic oxidation of catechol, approximately two atoms of oxygen are taken up for each molecule of catechol, whereas only one atom is required for oxidation to the o-quinone stage. Wagreich and Nelson1 consider this extra uptake to be accounted for by the interaction of the o-benz-quinone with water to form 1 : 2 : 4-trihydroxy-benzene ...
E A H, ROBERTS, D J, WOOD
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A Novel Catechol Oxidase Enzyme Electrode for the Specific Determination of Catechol
Bioscience, Biotechnology, and Biochemistry, 1998An 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 +5 more
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