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Journal articles on the topic 'Catechol oxidation kinetics'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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1

Saeidian, Shahriar. "Inhibition of Diphenol Oxidase Activity of Strawberry (Fragaria sp.) Using L-Cysteine and L-Glycine." International Letters of Chemistry, Physics and Astronomy 48 (March 2015): 194–202. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.48.194.

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L-glycine and L-cysteine exhibit, strong inhibition of partial purified DIPHENOL OXIDASE at strawberry. The concentration of L-glycine inhibiting Diphenol oxidase activity by 50% (IC50) was 0.5 and 0.4 mM at pH 6.7 and 8, respectively. The inhibition of partial purified Diphenol oxidase activity is pH and inhibitor dependent. Kinetic studies indicate that L-glycine is a uncompetetive inhibitor and L-cysteine is competitive and noncompetitive inhibitor of Diphenol oxidase activity. Vmax and Km for catechol oxidation at pH 6.7 and in presence of L-glycine (1.4M) was 0.09 ∆A min-1 and 10 mM. Vmax

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2

Jordan, R. B., and J. H. Xu. "Substitution and oxidation kinetics in substituted catechol - iron(III) systems." Pure and Applied Chemistry 60, no. 8 (1988): 1205–8. http://dx.doi.org/10.1351/pac198860081205.

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3

Lin, Qianqi, Qian Li, Christopher Batchelor-McAuley, and Richard G. Compton. "Two-Electron, Two-Proton Oxidation of Catechol: Kinetics and Apparent Catalysis." Journal of Physical Chemistry C 119, no. 3 (2015): 1489–95. http://dx.doi.org/10.1021/jp511414b.

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4

Abrha, Tadesse, Rishi Pal, and R. C. Saini. "A Study on Voltametric Electro-kinetic Mechanism of Catechol at l-glutamic Acid-Carbon Paste Sensor." Journal of Surface Science and Technology 33, no. 1-2 (2017): 1. http://dx.doi.org/10.18311/jsst/2017/6187.

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Quinones and quinoles, the pervasive components of living organism, perform different biochemical and physiological activities. These compounds have found their widespread applications as life saving drugs in cancer chemotherapy, antioxidant, anti bacterial and antifungal agents. These contribute as components of biological electron transfer chains located indifferent body parts. Electrochemical redox behavior of catechol using cyclic and differential pulse voltammetry at the surface of ℓ-glutamic acid modified carbon paste sensor was observed quite sensitive. There was a remarkable increase i

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5

Sun, Jianfei, Qiong Mei, Bo Wei, Long Huan, Ju Xie, and Maoxia He. "Mechanisms for ozone-initiated removal of biomass burning products from the atmosphere." Environmental Chemistry 15, no. 2 (2018): 83. http://dx.doi.org/10.1071/en17212.

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Environmental contextAn important product of biomass burning is catechol: its presence in the atmosphere can have adverse effects on health, and can lead to the formation of secondary organic aerosols. We report a theoretical study on the mechanisms and kinetics of removal of catechol from the atmosphere by reaction with ozone. These data will provide insight into the ozonolysis of other lignin compounds produced by biomass burning. AbstractWe examined the ozone-initiated oxidation of catechol, an intermediate of lignin pyrolysis in the atmosphere, by using the theoretical computational method

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6

Yue, P. L., and O. Legrini. "Photochemical Degradation of Organics in Water." Water Quality Research Journal 27, no. 1 (1992): 123–38. http://dx.doi.org/10.2166/wqrj.1992.007.

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Abstract Trichloroethylene, phenol, 4-cholorophenol, catechol and a pesticide were degraded by two advanced oxidation processes: photolytic oxidation with hydrogen peroxide, andphotolytic oxidation with ozone. The reactions were studied in a batch photoreactor with a low pressure mercury lamp as the radiation source. The variation of the concentration of total organic carbon with time was measured. For the organics studied, the reaction kinetics for the reduction of total organic carbon (TOC) were found to follow a power law. The exponent of the power law varies with the initial TOC concentrat

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7

Mutti, Francesco G., Roberta Pievo, Maila Sgobba, Michele Gullotti, and Laura Santagostini. "Biomimetic Modeling of Copper Complexes: A Study of Enantioselective Catalytic Oxidation onD-(+)-Catechin andL-(−)-Epicatechin with Copper Complexes." Bioinorganic Chemistry and Applications 2008 (2008): 1–9. http://dx.doi.org/10.1155/2008/762029.

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The biomimetic catalytic oxidations of the dinuclear and trinuclear copper(II) complexes versus two catechols, namely,D-(+)-catechin andL-(−)-epicatechin to give the corresponding quinones are reported. The unstable quinones were trapped by the nucleophilic reagent, 3-methyl-2-benzothiazolinone hydrazone (MBTH), and have been calculated the molar absorptivities of the different quinones. The catalytic efficiency is moderate, as inferred by kinetic constants, but the complexes exhibit significant enantio-differentiating ability towards the catechols, albeit for the dinuclear complexes, this ena

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8

Chen, Xiao, Yanling Zhang, Xuefei Zhou, et al. "Application of a Novel Semiconductor Catalyst, CT, in Degradation of Aromatic Pollutants in Wastewater: Phenol and Catechol." Journal of Nanomaterials 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/524141.

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Water-soluble phenol and phenolic compounds were generally removed via advanced oxidation processes. A novel semiconductor catalyst, CT, was the first-time employed in the present study to degrade phenol and catechol. The phenolic compounds (initial concentration of 88 mg L−1) were completely mineralized by the CT catalytic nanoparticles (1%) within 15 days, under acidic condition and with the presence of mild UV radiation (15 w, the emitted wavelength is 254 nm and the light intensity <26 μw/cm2). Under the same reaction condition, 1% TiO2(mixture of rutile and anatase, nanopowder, <100

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9

Hou, Baolin, Hongjun Han, Shengyong Jia, Haifeng Zhuang, Peng Xu, and Dexin Wang. "Heterogeneous electro-Fenton oxidation of catechol catalyzed by nano-Fe3O4: kinetics with the Fermi's equation." Journal of the Taiwan Institute of Chemical Engineers 56 (November 2015): 138–47. http://dx.doi.org/10.1016/j.jtice.2015.04.017.

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10

Samanta, Sumanta, Vignesh K. Rangasami, N. Arul Murugan, Vijay Singh Parihar, Oommen P. Varghese, and Oommen P. Oommen. "An unexpected role of an extra phenolic hydroxyl on the chemical reactivity and bioactivity of catechol or gallol modified hyaluronic acid hydrogels." Polymer Chemistry 12, no. 20 (2021): 2987–91. http://dx.doi.org/10.1039/d1py00013f.

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Gallic acid-functionalized materials possess superior tissue-adhesive, antioxidant, and immunomodulatory properties due to the lower pK<sub>a</sub> and faster oxidation kinetics, making them superior to dopamine derivatives for biomedical applications.

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11

McAuley, A., Lee Spencer, and P. R. West. "Kinetics and mechanism of the oxidation of benzenediols and ascorbic acid by bis(1,4,7-triazacyciononane)nickel(III) in aqueous perchlorate media." Canadian Journal of Chemistry 63, no. 6 (1985): 1198–203. http://dx.doi.org/10.1139/v85-204.

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The reactions of the outer-sphere electron transfer reagent, Ni(9-aneN3)23+, (bis(1,4,7-triazacyclononane)nickel(III) ion) with ascorbic acid, hydroquinone, catechol, and resorcinol have been investigated. The absence of any proton related equilibria with the oxidant provides a means of ascribing the observed inverse hydrogen ion dependences to reactions of the dissociated ascorbate or quinolate ions, (HA−). The data are consistent with the rate-determining one-electron transfer reactions:[Formula: see text]followed by rapid oxidation of the radical ions formed. In the reaction with ascorbic a

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12

Beyazit, Neslihan, Didem Çakmak, and Cahit Demetgül. "Chromone-based Schiff base metal complexes as catalysts for catechol oxidation: Synthesis, kinetics and electrochemical studies." Tetrahedron 73, no. 19 (2017): 2774–79. http://dx.doi.org/10.1016/j.tet.2017.03.081.

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13

Morosanova, Maria A., Anton S. Fedorov та Elena I. Morosanova. "Сrude Plant Extracts Mediated Polyphenol Oxidation Reactions in the Presence of 3-Methyl-2-Benzothiazolinone Hydrazone for the Determination of Total Polyphenol Content in Beverages". Current Analytical Chemistry 15, № 1 (2018): 11–20. http://dx.doi.org/10.2174/1573411014666180319124710.

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Background: The consumption of antioxidants, including phenolic compounds, is considered important for preventing the oxidative damage diseases and ageing. The total polyphenol content (TPC) is the parameter used to estimate the quality of plant-derived products. Methods: Phenol oxidase activity of green bean (Phaseolus vulgaris) crude extract (in the presence of hydrogen peroxide) and banana (Musa sp.) pulp crude extract has been studied spectrophotometrically using catechol, gallic acid, caffeic acid, ferulic acid, and quercetin as substrates. All studied compounds have been oxidized in the

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14

Lee, Han-Saem, Jin Hur, Doo-Hee Lee, Mark A. Schlautman, and Hyun-Sang Shin. "Removal of 1,4-Naphthoquinone by Birnessite-Catalyzed Oxidation: Effect of Phenolic Mediators and the Reaction Pathway." International Journal of Environmental Research and Public Health 17, no. 13 (2020): 4853. http://dx.doi.org/10.3390/ijerph17134853.

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This study investigated the birnessite (δ-MnO2) catalyzed oxidative removal of 1,4-naphthoquinone (1,4-NPQ) in the presence of phenolic mediators; specifically, the kinetics of 1,4-NPQ removal under various conditions was examined, and the reaction pathway of 1,4-NPQ was verified by liquid chromatography–tandem mass spectrometry (LC–MS/MS). The removal rate of 1,4-NPQ by birnessite-catalyzed oxidation (pH = 5) was faster in the presence of phenolic mediators with electron-donating substituents (pseudo-first-order initial stage rate constant (k1) = 0.380–0.733 h−1) than with electron-withdrawin

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15

COOKSEY, Christopher J., Peter J. GARRATT, Edward J. LAND, Christopher A. RAMSDEN, and Patrick A. RILEY. "Tyrosinase kinetics: failure of the auto-activation mechanism of monohydric phenol oxidation by rapid formation of a quinomethane intermediate." Biochemical Journal 333, no. 3 (1998): 685–91. http://dx.doi.org/10.1042/bj3330685.

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When 3,4-dihydroxybenzylcyanide (DBC) is oxidized by mushroom tyrosinase, the first visible product, identified as the corresponding quinomethane, exhibits an absorption maximum at 480 nm. Pulse-radiolysis experiments, in which the o-quinone is formed by disproportionation of semiquinone radicals generated by single-electron oxidation of DBC, showed that the quinomethane (A480 6440 M-1·cm-1) is formed through the intermediacy of the o-quinone with a rate constant at neutral pH of 7.5 s-1. The oxygen stoichiometry of the formation of the quinomethane by tyrosinase-catalysed oxidation of DBC was

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16

Ju, Kou-San, and Rebecca E. Parales. "Control of Substrate Specificity by Active-Site Residues in Nitrobenzene Dioxygenase." Applied and Environmental Microbiology 72, no. 3 (2006): 1817–24. http://dx.doi.org/10.1128/aem.72.3.1817-1824.2006.

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ABSTRACT Nitrobenzene 1,2-dioxygenase from Comamonas sp. strain JS765 catalyzes the initial reaction in nitrobenzene degradation, forming catechol and nitrite. The enzyme also oxidizes the aromatic rings of mono- and dinitrotoluenes at the nitro-substituted carbon, but the basis for this specificity is not understood. In this study, site-directed mutagenesis was used to modify the active site of nitrobenzene dioxygenase, and the contribution of specific residues in controlling substrate specificity and enzyme performance was evaluated. The activities of six mutant enzymes indicated that the re

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17

Ruiz-Carmuega, Ana Isabel, Celia Garcia-Hernandez, Javier Ortiz, et al. "Electrochemical Sensors Modified with Combinations of Sulfur Containing Phthalocyanines and Capped Gold Nanoparticles: A Study of the Influence of the Nature of the Interaction between Sensing Materials." Nanomaterials 9, no. 11 (2019): 1506. http://dx.doi.org/10.3390/nano9111506.

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Voltametric sensors formed by the combination of a sulfur-substituted zinc phthalocyanine (ZnPcRS) and gold nanoparticles capped with tetraoctylammonium bromide (AuNPtOcBr) have been developed. The influence of the nature of the interaction between both components in the response towards catechol has been evaluated. Electrodes modified with a mixture of nanoparticles and phthalocyanine (AuNPtOcBr/ZnPcRS) show an increase in the intensity of the peak associated with the reduction of catechol. Electrodes modified with a covalent adduct-both component are linked through a thioether bond-(AuNPtOcB

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18

Villota, Natalia, Luis Miguel Camarero, Jose Maria Lomas, and Mikel Legaristi. "Kinetic Modelling of Photoconversion of Phenol by a Photo-Fenton Reagent and UV." International Journal of Chemical Reactor Engineering 12, no. 1 (2014): 405–16. http://dx.doi.org/10.1515/ijcre-2013-0130.

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Abstract This study analyses the oxidation of phenol using Fenton reagent in presence of ultraviolet light, enhancing the mineralization capacity of the treatment. Phenol oxidation generates reaction intermediates more toxic and refractory than phenol itself. Thus, the reaction must be carried out under harder conditions, leading these compounds to biodegradable acids that can be dumped into public sewages. Then, this paper considers a complete kinetic modelling of the phenol oxidation stages, differentiating the formation rate of species generated through ortho, meta and para pathways. The mo

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19

Lobo, C. C., N. C. Bertola, and E. M. Contreras. "INHIBITION KINETICS DURING THE OXIDATION OF BINARY MIXTURES OF PHENOL WITH CATECHOL, RESORCINOL AND HYDROQUINONE BY PHENOL ACCLIMATED ACTIVATED SLUDGE." Brazilian Journal of Chemical Engineering 33, no. 1 (2016): 59–71. http://dx.doi.org/10.1590/0104-6632.20160331s20150173.

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20

Rahbar, Ali, Ehsan Zahedi, Hossein Aghaie, Masoud Giahi, and Karim Zare. "DFT Insight into the Kinetics and Mechanism of the OH . ‐Initiated Atmospheric Oxidation of Catechol: OH . Addition and Hydrogen Abstraction Pathways." ChemistrySelect 6, no. 16 (2021): 3875–83. http://dx.doi.org/10.1002/slct.202100524.

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21

Khomenko, D., R. Doroschuk, I. Odarych, I. Raspertova, and R. Lampeka. "CATECHOLASE ACTIVITY OF A COPPER(II) COMPLEX WITH THE 2-(5-(1,2,4)TRIAZOLE-1-ILMETHYL-1H-(1,2,4)-TRIAZOLE-3-IL)-PYRIDYL." Bulletin of Taras Shevchenko National University of Kyiv. Chemistry, no. 1 (57) (2020): 19–22. http://dx.doi.org/10.17721/1728-2209.2020.1(57).5.

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Methods of the synthesis of 2-(5-(1,2,4)triazol-1-ylmethyl-1H-(1,2,4)-triazol-3-yl)-pyridine and a binuclear copper complex are described. The structure of the complex is established by X-ray structural analysis. The complex is a centrosymmetric [Cu2(L)2(NO3)2·2H2O]·H2O dimer. The Cu-Cu distance is 4.0408 (3) Å. In the complex the ligand is in a deprotonated state. Due to this, the triazole fragment acts as a bridge between the two metal centers. Copper ions are in an octahedral environment. The equatorial plane is formed by three triazole nitrogen atoms and one pyridyl nitrogen atom. The axia

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22

Aktaş, Nahit, and Abdurrahman Tanyolaç. "Kinetics of laccase-catalyzed oxidative polymerization of catechol." Journal of Molecular Catalysis B: Enzymatic 22, no. 1-2 (2003): 61–69. http://dx.doi.org/10.1016/s1381-1177(03)00007-9.

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23

Leontieş, Anca-Ruxandra, Adina Răducan, Ioana Catalina Gîfu, and Dan Florin Anghel. "Catechin oxidation products: mechanistic aspects and kinetics." Studia Universitatis Babeș-Bolyai Chemia 62, no. 4 (2017): 11–19. http://dx.doi.org/10.24193/subbchem.2017.4.01.

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24

Dencheva, Nadya, Sandra Oliveira, Joana Braz, et al. "Magnetically Responsive PA6 Microparticles with Immobilized Laccase Show High Catalytic Efficiency in the Enzymatic Treatment of Catechol." Catalysts 11, no. 2 (2021): 239. http://dx.doi.org/10.3390/catal11020239.

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Herewith we report the first attempt towards non-covalent immobilization of Trametes versicolor laccase on neat and magnetically responsive highly porous polyamide 6 (PA6) microparticles and their application for catechol oxidation. Four polyamide supports, namely neat PA6 and such carrying Fe, phosphate-coated Fe and Fe3O4 cores were synthesized in suspension by activated anionic ring-opening polymerization (AAROP) of ε-caprolactam (ECL). Enzyme adsorption efficiency up to 92% was achieved in the immobilization process. All empty supports and PA6 laccase complexes were characterized by spectr

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25

Kirkwood, Kathleen, and S. David Jackson. "Hydrogenation and Hydrodeoxygenation of Oxygen-Substituted Aromatics over Rh/silica: Catechol, Resorcinol and Hydroquinone." Catalysts 10, no. 5 (2020): 584. http://dx.doi.org/10.3390/catal10050584.

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The hydrogenation and hydrodeoxygenation (HDO) of dihydroxybenzene isomers, catechol (1,2-dihydroxybenzene), resorcinol (1,3-dihydroxybenzene) and hydroquinone (1,4-dihydroxybenzene) was studied in the liquid phase over a Rh/silica catalyst at 303–343 K and 3 barg hydrogen pressure. The following order of reactivity, resorcinol > catechol > hydroquinone (meta > ortho > para) was obtained. Kinetic analysis revealed that catechol had a negative order of reaction whereas both hydroquinone and resorcinol gave positive half-order suggesting that catechol is more strongly adsorbed. Activ

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26

Asgari, Faraj, and Dimitris S. Argyropoulos. "Article." Canadian Journal of Chemistry 76, no. 11 (1998): 1606–15. http://dx.doi.org/10.1139/v98-132.

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The complex interaction of softwood residual kraft lignin with oxygen at elevated temperatures, pressures, and pH's was investigated by isolating and systematically oxidizing the lignin, as a function of time and temperature. The isolation of the oxidized lignin was carried out using a multistep procedure developed specifically to recover all species. Detailed quantitative 31P NMR measurements provided, for the first time, three-dimensional plots describing the formation and (or) elimination of the various functional groups. Oxidative demethoxylation reactions were found to induce the formatio

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27

Panoutsopoulos, Georgios I., and Christine Beedham. "Kinetics and specificity of guinea pig liver aldehyde oxidase and bovine milk xanthine oxidase towards substituted benzaldehydes." Acta Biochimica Polonica 51, no. 3 (2004): 649–63. http://dx.doi.org/10.18388/abp.2004_3550.

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Molybdenum-containing enzymes, aldehyde oxidase and xanthine oxidase, are important in the oxidation of N-heterocyclic xenobiotics. However, the role of these enzymes in the oxidation of drug-derived aldehydes has not been established. The present investigation describes the interaction of eleven structurally related benzaldehydes with guinea pig liver aldehyde oxidase and bovine milk xanthine oxidase, since they have similar substrate specificity to human molybdenum hydroxylases. The compounds under test included mono-hydroxy and mono-methoxy benzaldehydes as well as 3,4-dihydroxy-, 3-hydroxy

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28

Jovanovic, S. V., K. Kónya, and J. C. Scaiano. "Redox reactions of 3,5-di-tert-butyl-1,2-benzoquinone. Implications for reversal of paper yellowing." Canadian Journal of Chemistry 73, no. 11 (1995): 1803–10. http://dx.doi.org/10.1139/v95-222.

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One- and two-electron transfer reactions of 3,5-di-tert-butylcatechol and the corresponding quinone were studied by fast kinetic spectroscopy coupled with laser photolysis and pulse radiolysis, and by cyclic voltammetry in aqueous solutions. Photoionization of catechol yields the same semiquinone radical as the formate-radical-induced quinone reduction in the pulse radiolysis experiment. The neutral semiquinone radical deprotonates at pKr = 6.0 ± 0.1, as deduced from the pH induced changes in the radical spectra. The two-electron reduction potentials of quinone and catechol were measured by cy

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29

Haroune, Nicolas, Bruno Combourieu, Pascale Besse, et al. "Benzothiazole Degradation by Rhodococcus pyridinovorans Strain PA: Evidence of a Catechol 1,2-Dioxygenase Activity." Applied and Environmental Microbiology 68, no. 12 (2002): 6114–20. http://dx.doi.org/10.1128/aem.68.12.6114-6120.2002.

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ABSTRACT The pathway for biodegradation of benzothiazole (BT) and 2-hydroxybenzothiazole (OBT) by Rhodococcus pyridinovorans strain PA was studied in detail. The kinetics of biodegradation were monitored by in situ 1H nuclear magnetic resonance (NMR) in parallel with reversed-phase high-performance liquid chromatography (HPLC). Successive oxidations from BT to OBT and then from OBT to dihydroxybenzothiazole were observed. Further insight was obtained by using a mutant strain with impaired ability to grow on BT and OBT. The precise structure of another intermediate was determined by in situ two

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30

Feng, Fa-mei, Fu-an Liu, Shu-lan Cai, and Jia-qing Xie. "The Catalytic Oxidation of Aqueous Phenol by H2O2Using a Macrocyclic (N-Donor) Cobalt(Ii) Complex." Progress in Reaction Kinetics and Mechanism 36, no. 4 (2011): 342–51. http://dx.doi.org/10.3184/146867811x13103063934140.

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A new macrocyclic (N-donor) cobalt(II) complex, denoted CoR, was synthesized and characterized, and used as a mimetic peroxidase in the catalytic oxidation of phenol by H2O2. The catalytic system displayed high catalytic activity and the catalytic character of a metalloenzyme, although it did not attain the catalytic efficiency of enzymes. The final products were maleic and oxalic acids. Intermediate products, such as catechol and hydroquinone and p-benzoquinone, were detected by high-pressure liquid chromatography (HPLC) and UV-Vis spectrophotometry. The effects of temperature and the pH of t

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31

García-Hernández, Celia, Cristina García-Cabezón, Fernando Martín-Pedrosa, José Antonio De Saja, and María Luz Rodríguez-Méndez. "Layered composites of PEDOT/PSS/nanoparticles and PEDOT/PSS/phthalocyanines as electron mediators for sensors and biosensors." Beilstein Journal of Nanotechnology 7 (December 8, 2016): 1948–59. http://dx.doi.org/10.3762/bjnano.7.186.

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The sensing properties of electrodes chemically modified with PEDOT/PSS towards catechol and hydroquinone sensing have been successfully improved by combining layers of PEDOT/PSS with layers of a secondary electrocatalytic material such as gold nanoparticles (PEDOT/PSS/AuNPs), copper phthalocyanine (PEDOT/PSS/CuPc) or lutetium bisphthalocyanine (PEDOT/PSS/LuPc2). Layered composites exhibit synergistic effects that strongly enhance the electrocatalytic activity as indicated by the increase in intensity and the shift of the redox peaks to lower potentials. A remarkable improvement has been achie

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32

Kamau, P., and R. B. Jordan. "Kinetic Study of the Oxidation of Catechol by Aqueous Copper(II)." Inorganic Chemistry 41, no. 12 (2002): 3076–83. http://dx.doi.org/10.1021/ic010978c.

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33

Kanade, Santosh R., Beena Paul, A. G. Appu Rao, and Lalitha R. Gowda. "The conformational state of polyphenol oxidase from field bean (Dolichos lablab) upon SDS and acid-pH activation." Biochemical Journal 395, no. 3 (2006): 551–62. http://dx.doi.org/10.1042/bj20051509.

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Field bean (Dolichos lablab) contains a single isoform of PPO (polyphenol oxidase) – a type III copper protein that catalyses the o-hydroxylation of monophenols and oxidation of o-diphenols using molecular oxygen – and is a homotetramer with a molecular mass of 120 kDa. The enzyme is activated manyfold either in the presence of the anionic detergent SDS below its critical micellar concentration or on exposure to acid-pH. The enhancement of kcat upon activation is accompanied by a marked shift in the pH optimum for the oxidation of t-butyl catechol from 4.5 to 6.0, an increased sensitivity to t

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34

Gonţa, Maria. "The Role of the Natural Antioxidants in the Oxihaemoglobin Oxidation and the Diminution of Nitrite Concentration." Chemistry Journal of Moldova 2, no. 1 (2007): 67–77. http://dx.doi.org/10.19261/cjm.2007.02(1).12.

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The paper includes the study of the inhibition of the process of methemoglobinization at oxidation with nitrites in the presence of sodium dihydroxyfumarate (DFH3Na) and resveratrol (3,4’,5-trihydroxystilben). The experimental study was carried out by treatment of the erythrocyte mass by hemolysis and exposure to nitrite. The kinetic investigations were carried out in following conditions: [Resv] = (5.10-5 – 1.10-3) mol/l, [DFH3Na] = 1.10-6 – 5.10-6 mol/l; [HbO2]=1.10-3 mol/l; pH 7,1; t = 370C. The rate of transformation of HbO2 in the presence of resveratrol and DFH3Na was calculated from kin

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35

Jiménez-Atiénzar, M., J. Cabanes, F. Gandı́a-Herrero, and F. Garcı́a-Carmona. "Kinetic analysis of catechin oxidation by polyphenol oxidase at neutral pH." Biochemical and Biophysical Research Communications 319, no. 3 (2004): 902–10. http://dx.doi.org/10.1016/j.bbrc.2004.05.077.

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36

Khalafi, Lida, Mohammad Rafiee, Maryam Shahbak, and Hamidreza Shirmohammadi. "Kinetic Study of the Oxidation of Catechols in the Presence of N-Methylaniline." Journal of Chemistry 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/497515.

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37

LOPEZ-SERRANO, M., and A. ROS BARCELO. "Kinetic Properties of (+)-Catechin Oxidation by a Basic Peroxidase Isoenzyme from Strawberries." Journal of Food Science 62, no. 4 (1997): 676–723. http://dx.doi.org/10.1111/j.1365-2621.1997.tb15433.x.

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Nematollahi, Davood, Maryam Bamzadeh, and Hasan Shayani-Jam. "Electrochemical Oxidation of Catechols in the Presence of Phenyl-Meldrum's Acid. Synthesis and Kinetic Evaluation." CHEMICAL & PHARMACEUTICAL BULLETIN 58, no. 1 (2010): 23–26. http://dx.doi.org/10.1248/cpb.58.23.

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Sheng, Silu, and Edgardo T. Farinas. "Laccase and Its Mutant Displayed on the Bacillus subtilis Spore Coat for Oxidation of Phenolic Compounds in Organic Solvents." Catalysts 11, no. 5 (2021): 606. http://dx.doi.org/10.3390/catal11050606.

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Enzymes displayed on the Bacillus subtilis spore coat have several features that are useful for biocatalysis. The enzyme is preimmobilized on an inert surface of the spore coat, which is due to the natural sporulation process. As a result, protein stability can be increased, and they are resistant to environmental changes. Next, they would not lyse under extreme conditions, such as in organic solvents. Furthermore, they can be easily removed from the reaction solution and reused. The laboratory evolved CotA laccase variant T480A-CotA was used to oxidize the following phenolic substrates: (+)-c

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Adak, Piyali, Antu Mondal, and Shyamal Kumar Chattopadhyay. "Manganese(ii) complex of an oxygen–nitrogen donor Schiff base ligand showing efficient catechol oxidase activity: synthesis, spectroscopic and kinetic study." New Journal of Chemistry 44, no. 9 (2020): 3748–54. http://dx.doi.org/10.1039/c9nj04591k.

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A Mn(ii) complex containing two tridentate O,N,O-donor semicarbazone ligands shows very high catalytic activity for the aerial oxidation of 3,5DTBCH<sub>2</sub> with k<sub>cat</sub> = 3.10 × 10<sup>6</sup> h<sup>−1</sup>, and k<sub>cat</sub>/K<sub>M</sub> = 3.25 × 10<sup>8</sup> h<sup>−1</sup> M<sup>−1</sup>.

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Jouanneau, Yves, and Christine Meyer. "Purification and Characterization of an Arene cis-Dihydrodiol Dehydrogenase Endowed with Broad Substrate Specificity toward Polycyclic Aromatic Hydrocarbon Dihydrodiols." Applied and Environmental Microbiology 72, no. 7 (2006): 4726–34. http://dx.doi.org/10.1128/aem.00395-06.

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ABSTRACT Initial reactions involved in the bacterial degradation of polycyclic aromatic hydrocarbons (PAHs) include a ring-dihydroxylation catalyzed by a dioxygenase and a subsequent oxidation of the dihydrodiol products by a dehydrogenase. In this study, the dihydrodiol dehydrogenase from the PAH-degrading Sphingomonas strain CHY-1 has been characterized. The bphB gene encoding PAH dihydrodiol dehydrogenase (PDDH) was cloned and overexpressed as a His-tagged protein. The recombinant protein was purified as a homotetramer with an apparent M r of 110,000. PDDH oxidized the cis-dihydrodiols deri

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Coitinho, Juliana, Debora Costa, Samuel Guimaraes, et al. "Structural characterization of Polycyclic Aromatic Hydrocarbon degrading enzymes." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C472. http://dx.doi.org/10.1107/s2053273314095278.

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Polycyclic aromatic hydrocarbons (PAHs) are a group of aromatic hydrocarbons composed of two or more fused rings and include naphthalene, phenanthrene, pyrene and benzo[a]pyrene amongst others. Exposure to naphthalene has been associated with several toxic manifestations in humans and laboratory animals, with the lens of the eye and the lungs being most sensitive [1]. Additionally, this compound has been reclassified as a possible human carcinogen by the US Environmental Protection Agency and the International Agency for Research on Cancer. It has recently been suggested that naphthalene under

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Khalafi, Lida, and Mohammad Rafiee. "Kinetic study of the oxidation and nitration of catechols in the presence of nitrous acid ionization equilibria." Journal of Hazardous Materials 174, no. 1-3 (2010): 801–6. http://dx.doi.org/10.1016/j.jhazmat.2009.09.123.

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Sharp, Michael, Donald D. Montgomery, and Fred C. Anson. "Kinetics studies of oxidations of catechol and l-dopa as mediated by IrCli2−6 at polymer-coated glassy carbon electrodes." Journal of Electroanalytical Chemistry and Interfacial Electrochemistry 194, no. 2 (1985): 247–59. http://dx.doi.org/10.1016/0022-0728(85)85008-7.

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NEMATOLLAHI, DAVOOD, FATEMEH GHASEMI, SADEGH KHAZALPOUR, and FAHIMEH VARMAGHANI. "Kinetic study on electrochemical oxidation of catechols in the presence of cycloheptylamine and aniline: Experiments and digital simulation." Journal of Chemical Sciences 128, no. 12 (2016): 1887–94. http://dx.doi.org/10.1007/s12039-016-1193-y.

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Lee, Sun Hyung, Ji Sook Lim, and Han Seung Kim. "Decomposition of Chlorinated Hydrocarbons Using the Biocatalyst Immobilized by Clay Minerals." Advanced Materials Research 356-360 (October 2011): 1089–92. http://dx.doi.org/10.4028/www.scientific.net/amr.356-360.1089.

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Biochemical decomposition of catechol and 4-chlorocatechol, degradation intermediate products of 4-chlorophenol, was investigated using enzymes and their immobilized forms by clay minerals. An oxygenase that can initiate oxidative ring-fission of aromatic compounds was obtained via cloning of its gene (cphA-1) encoding hydroxyquinol dioxygenase contained in Arthrobacter chlorophenolicus A6 and overexpression and purification of the enzyme. The enzyme expressed in vitro was then immobilized onto the clay mineral (montmorillonite). Michaelis-Menten kinetic analysis was conducted to compare the e

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Cafaro, Valeria, Eugenio Notomista, Paola Capasso, and Alberto Di Donato. "Regiospecificity of Two Multicomponent Monooxygenases from Pseudomonas stutzeri OX1: Molecular Basis for Catabolic Adaptation of This Microorganism to Methylated Aromatic Compounds." Applied and Environmental Microbiology 71, no. 8 (2005): 4736–43. http://dx.doi.org/10.1128/aem.71.8.4736-4743.2005.

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ABSTRACT The pathways for degradation of aromatic hydrocarbons are constantly modified by a variety of genetic mechanisms. Genetic studies carried out with Pseudomonas stutzeri OX1 suggested that the tou operon coding for toluene o-xylene monooxygenase (ToMO) was recently recruited into a preexisting pathway that already possessed the ph operon coding for phenol hydroxylase (PH). This apparently resulted in a redundancy of enzymatic activities, because both enzymes are able to hydroxylate (methyl)benzenes to (methyl)catechols via the intermediate production of (methyl)phenols. We investigated

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Serpone, N., R. Terzian, P. Colarusso, C. Minero, E. Pelizzetti, and H. Hidaka. "Sonochemical oxidation of phenol and three of its intermediate products in aqueous media: Catechol, hydroquinone, and benzoquinone. Kinetic and mechanistic aspects." Research on Chemical Intermediates 18, no. 2 (1993): 183–202. http://dx.doi.org/10.1163/156856792x00281.

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Khalafi, Lida, Mohammad Rafiee, and Leila Boutorabi. "Kinetic Study of the Oxidation of Quercetin and Catechin in the Absence and Presence of Nitrite Ion." Progress in Reaction Kinetics and Mechanism 37, no. 3 (2012): 311–20. http://dx.doi.org/10.3184/146867812x13413088912737.

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Fotouhi, L., S. Asadi, E. Tammari, M. M. Heravi, and D. Nematollahi. "Electrochemical oxidation of catechol and 4-tert-butylcatechol in the presence of 1-Methyl-1H-imidazole-2-thiol: Synthesis and kinetic study." Journal of the Iranian Chemical Society 5, no. 4 (2008): 712–17. http://dx.doi.org/10.1007/bf03246154.

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