Results 181 to 190 of about 19,118 (230)

Platinum Nanoparticles: Efficient and Stable Catechol Oxidase Mimetics

ACS Applied Materials & Interfaces, 2015
Although 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
exaly   +4 more sources

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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, 2023
Nanozymes, 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
exaly   +3 more sources

The catalytic cycle of catechol oxidase

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.
Per E M Siegbahn, Siegbahn Per E M
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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).
Jinghui Zhang, Jinqing Kan
exaly   +3 more sources

Tyrosinase versus Catechol Oxidase: One Asparagine Makes the Difference

Angewandte Chemie - International Edition, 2016
AbstractTyrosinases 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
exaly   +3 more sources

Evidence for conformational changes in grape catechol oxidase

Phytochemistry, 1972
Abstract 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 ...
E Harel
exaly   +2 more sources