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Journal articles on the topic 'Phenol Oxidas'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Vishnu, Priya S., and P. Somasundaram. "INDUCED PHENOLOXIDASE PROFILES IN SILKWORM Bombyx mori (L.) UNDER BIOTIC STRESS." International Journal of Engineering Technologies and Management Research 4, no. 10 (2017): 46–52. https://doi.org/10.5281/zenodo.1042479.

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<strong><em>Phenol oxidase (PO) is one of the stress enzyme protein in living organism. The conversion of Pro-PO into an activation form of PO required a stress protein. In the present study has emerged with the novel finding of induced phenoloxidase was identified under bacterial endotoxin viz., Lipopolysaccharide (LPS) activity using silkworm Bombyx mori as an animal model. The PO enzyme plays an important role for insect survival during pathophysiological conditions. The enzyme activity was analyzed from ten different silkworm races with two phenolic substrates viz., L-Dopa and Dopamine by

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2

B, Anita, and Samiyappan S. "NDUCTION OF SYSTEMIC RESISTANCE IN RICE BY PSEUDOMONAS FLUORESCENT AGAINST RICE ROOT KNOT NEMATODE MELOIDOGYNE GRAMINICOLA." Journal of Biopesticides 5 (April 1, 2012): 53–59. https://doi.org/10.57182/jbiopestic.5.0.53-59.

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Induction ofdefense enzymes phenol, peroxidase (PO), polyphenol oxidase (PPO),phenyl ammonia lyase (PAL), super oxide dismutase (SOD) and chitinase by Pseudomonasfluorescens isolate Pf1, against challenge inoculation of Meloidogynegraminicola in rice was studied in vitro. The activity of phenol,PO,PPO, PAL and chitinase was higher in the bacterized rice plants. Theanalysis of isoform profiles revealed unique PO, PPO and SOD isoforms inducedin plants treated with P. fluorescens. The present study implies earlierand higher accumulation of phenols and defense enzymes viz., PO, PPO,PAL and chitina

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3

Truchan, Nadina, Christian Jandl, Alexander Pöthig, Stefan Breitenlechner, and Thorsten Bach. "Access to Biphenyls by Palladium-Catalyzed Oxidative Coupling of Phenyl Carbamates and Phenols." Synthesis 51, no. 16 (2019): 3060–76. http://dx.doi.org/10.1055/s-0037-1611482.

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The oxidative cross-coupling of phenols (3 equiv) to various substituted phenyl N,N-diethylcarbamates was explored with a variety of substrates. Pd(OAc)2 was employed as the catalyst (20 mol%) and K2S2O8 as the stoichiometric oxidant in trifluoroacetic acid as the solvent (50 °C, 2 h). Carbamates without or with a substituent on the phenyl ring (Me, Ph, Cl, OMe) underwent the reaction unless the phenyl substituent was too strongly electron withdrawing (CN). Cross-coupling occurred exclusively in the ortho position relative to the carbamate group. The regioselectivity at the phenol (ortho or pa

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4

Durrant, H. J., N. A. Ratcliffe, C. R. Hipkin, A. Aspan, and K. Söderhäll. "Purification of the pro-phenol oxidase enzyme from haemocytes of the cockroach Blaberus discoidalis." Biochemical Journal 289, no. 1 (1993): 87–91. http://dx.doi.org/10.1042/bj2890087.

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Pro-phenol oxidase was purified from the haemocytes of the cockroach Blaberus discoidalis by Blue Sepharose chromatography, hydrophobic-interaction chromatography on a Phenyl-Superose column and, finally, gel filtration on a Superose 6 column. Results suggest that the molecule exists as a polymer of identical 76 kDa monomeric units. The enzyme is a glycoprotein with pI of 5.2 and can be converted by trypsin into phenol oxidase.

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5

T, Thiruveni, Shanthi M, Murali Baskaran R K, and Raguchander T. "Field Evaluation of Microbial Consortia Mediated Resistance against Okra Shoot and Fruit borer, Earias vittella." Madras Agricultural Journal 99, March (2012): 102–6. http://dx.doi.org/10.29321/maj.10.100025.

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A field experiment was conducted during Kharif 2009 to evaluate the microbial consortia mediated resistance against okra shoot and fruit borer, Earias vittella (Fab.) in okra variety, Arka Anamika and hybrid, CoBhH1. The microbial consortium Pseudomonas fluorescens Pf1 + Beauveria bassiana B2 isolate (Pf1 + B2) was effective in reducing the shoot and fruit borer infestation through seed treatment, soil application and foliar spray. Pf1 + B2 recorded minimum shoot damage during vegetative and reproductive phases (3.99 and 14.33 %) as against untreated check (13.58 and 24.16 %). Fruit infestatio

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6

Kidwai, Mazaahir, Arti Jain, Abha Sharma, and Ramesh Chander Kuhad. "Ecofriendly approach for detection of phenols in water using laccase from different fungi." Water Science and Technology 66, no. 2 (2012): 385–93. http://dx.doi.org/10.2166/wst.2012.198.

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Laccase-initiated oxidative coupling reactions of phenol and its derivatives with 4-aminoantipyrene using air as an oxidant has been investigated. The oxidation reaction of phenols and 4-aminoantipyrene is getting a lot of attention due to environmental concerns. Oxidation of simple phenol and 4-aminoantipyrene as a benchmark reaction enabled us to rank the relative oxidation ability of various laccases. Among the laccases tested, laccase from Pycnoporus cinnabarinus successfully yielded 72% antipyrilquinoneimine dye. The present method can also be used to determine p-substituted phenols and c

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7

Thangaraj, T., A. Vinayakam, and K. Nellaiappan. "Phenol oxidase activity of a monogenean, Paramazocraes thrissocles." Journal of Helminthology 60, no. 3 (1986): 234–38. http://dx.doi.org/10.1017/s0022149x00026158.

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AbstractThe phenol oxidase of a monogenean, Paramazocraes thrissocles, oxidizes phenolic amines more effectively than other phenols studied. Based on the substrate specificity, the probable substrate for eggshell formation has been suggested. The enzyme shows the pH optimum of 7–2. At 40°C it shows maximum activity. Proenzyme is activated by metal ions and detergents. Copper chelating compounds strongly inhibit the enzyme.

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8

Guo, Shengmei, Hu Cai, Wenjie Yan, et al. "NiCl2 as a Cheap and Efficient Precatalyst for the Coupling of Aryl Fluorosulfonate and Phosphite/Phosphine Oxide." Synlett 32, no. 14 (2021): 1453–56. http://dx.doi.org/10.1055/a-1524-4912.

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AbstractHerein, NiCl2 is employed as a cheap precatalyst in the formation of C(sp2)–P bond via cross-coupling reaction of phenol derivatives and phosphine oxides/phosphites. This catalytic system allows a variety of phenols with diverse functional groups to transform into phosphates with good yields. No additional additive is used in this reaction.

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9

Loncar, Nikola, Natasa Bozic, Ivan Andjelkovic, et al. "Removal of aqueous phenol and phenol derivatives by immobilized potato polyphenol oxidase." Journal of the Serbian Chemical Society 76, no. 4 (2011): 513–22. http://dx.doi.org/10.2298/jsc100619046l.

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Phenols containing halogens, which tend to deactivate the aromatic nuclei, constitute a significant category of highly toxic and difficult-to-degrade pollutants, which arise from a wide variety of industries. The main purpose of this study was to obtain an inexpensive immobilized enzyme for the removal of phenols. Partially purified potato polyphenol oxidase (PPO) was immobilized onto different commercial and laboratory produced carriers. Three of the obtained biocatalysts, with the highest PPO activities, namely Eupergit C250L-PPO; Celite-PPO and Cellulose M-PPO, were tested in a batch reacto

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10

Ezerskis, Z., and Z. Jusys. "Oxidation of chlorophenols on Pt electrode in alkaline solution studied by cyclic voltammetry, galvanostatic electrolysis, and gas chromatographymass spectrometry." Pure and Applied Chemistry 73, no. 12 (2001): 1929–40. http://dx.doi.org/10.1351/pac200173121929.

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Potentiodynamic investigations on a platinum electrode show that oxidation of phenol, monochlorophenols, dichlorophenols, 2,3,6-, 2,4,5-, 2,4,6-trichlorophenols, and pentachlorophenol in 1 M NaOH solution, containing 1 mM of phenols, proceeds in the potential region of Pt oxide formation. The oxidation rate of phenols decreases with the increase in the number of chlorine atoms in the benzene ring in the row: phenol > monochlorophenols > dichlorophenols > trichlorophenols > pentachlorophenol. The electrochemical stability of phenols, as studied using a cyclic voltammetry, depends on

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11

R, ARUN KUMAR, and CHEZHIYAN N. "Morphogenetic and biochemical basis for stem borer (Conogethes punctiferalis guene) resistance in turmeric (Curuna longa L.) genotypes." Madras Agricultural Journal 92, june (2005): 292–300. http://dx.doi.org/10.29321/maj.10.a00051.

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Field trial was conducted in Turmeric (Curcuma longa L.) in the Department of Spices and Plantation crops, Horticultural College and Research Institute, Tamil Nadu Agricultural University in a randomized block design with twenty six genotypes in two replications during the year 2000-2003. Observations were recorded on yield, stem borer (Conogethes punctiferalis Guen) incidence and various biochemical traits such as total phenols, poly phenol oxidase (PPO), peroxidase and catalase. The results revealed that the genotypes with higher tolerance limit showed higher peroxidase, PPO, catalase and ph

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12

Intisar, Anum. "Impact of Seed Treatments with Fungal Biocontrol Agents on Enzymatic Activities and Phenolic Content of Soybean under Greenhouse and Field Conditions." International Journal of Agriculture and Biology 26, no. 02 (2021): 294–302. http://dx.doi.org/10.17957/ijab/15.1837.

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Fungi in the genus Trichoderma are widely used as biological control agents because they can suppress plant pathogens and activate plant defense systems. In the present study, efficacy of microbial antagonists viz., T. harzianum and T. viride or their combination was evaluated against the pathogenic fungus Macrophomina phaseolina and their effect on enzymatic activities and phenol content of soybean [Glycine max (L.) Merr.] plants. Soybean seeds were inoculated with T. harzianum and T. viride separately or in combination, and sown in pots under green house and under field conditions. Host enzy

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13

McBride, M. B., and King-Hsi Kung. "Adsorption of phenol and substituted phenols by iron oxides." Environmental Toxicology and Chemistry 10, no. 4 (1991): 441–48. http://dx.doi.org/10.1002/etc.5620100403.

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14

Kalaria, Rishee K., Jigar Bhabhor, Nilima Karmakar, and Samarth R. Patel. "Research on the Biochemical Alterations in Mungbean [Vigna radiata (L.) Wilczek] Caused by the Mungbean Yellow Mosaic India Virus (MYMIV)." PLANT CELL BIOTECHNOLOGY AND MOLECULAR BIOLOGY 25, no. 9-10 (2024): 1–13. http://dx.doi.org/10.56557/pcbmb/2024/v25i9-108746.

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In the current study, the biochemical changes in mungbean caused by the yellow India virus were investigated. At 30 and 60 days after sowing (DAS), the biochemical contents were examined by the researchers. These included total phenol, total sugar, total protein, total chlorophyll, and enzyme activity of phenyl nine ammonia lyase (PAL), polyphenol oxidase (PPO), and peroxidase (PO). It was found that the phenol concentration of resistant genotypes was higher than that of extremely sensitive genotypes. A similar pattern was seen in the concentration of chlorophyll, total phenol, and the activit

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15

Ilavenil, K. K., A. Kasthuri, and K. Anbarasu. "OXIDATION KINETICS OF PHENOL, ITS DERIVATIVES AND SOME PARA-SUBSTITUTED PHENOL BY PYRAZINIUM CHLOROCHROMATE IN ACIDIC MEDIUM: A NON-LINEAR HAMMETT PLOTS." RASAYAN Journal of Chemistry 15, no. 03 (2022): 1660–67. http://dx.doi.org/10.31788/rjc.2022.1536920.

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In the presence of perchloric acid, the kinetics and oxidation of phenol, phenoxy acetic acid, and a few para-substituted phenols and phenoxyacetic acids by pyrazinium chlorochromate (PzCC) were investigated in acetic acid and water medium. The reaction was fractional-order for both the substrates and unit order for oxidant and acid. The products of oxidation are quinone. Comparing the reaction rate for phenols and their derivatives revealed a similar behavior. The oxidation and kinetics of phenol and its derivatives are established using the non-linear Hammett plots plot which reveal that par

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16

Bhagavathiammai, A., and K. Ramalingam. "Studies on the enzyme phenol oxidase in a freshwater monogenetic trematode." Journal of Helminthology 60, no. 3 (1986): 201–9. http://dx.doi.org/10.1017/s0022149x00026109.

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AbstractCytochemical localization of the enzyme phenol oxidase inNeomurraytrema tengrahas been studied. Results reveal that the enzyme reacts with substrates such as catechol, hydroquinone, pyrogallol, dopa, doparmine, epinephrine and tyramine, but not with tyrosine and protocatechuic acid. Thus it shows activity with a wide range of phenols, aminated, mono and diphenols and also with deaminated and decarboxylated, di- and polyphenols. The maximum activity of the enzyme occurs between 40°C and 50°C with a pH optimum of 6–6.

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17

Radomska, M., and A. Husieva. "Photocatalytic treatment of waters, polluted with phenols." Technogenic and ecological safety 10(2/2021) (November 25, 2021): 3–9. https://doi.org/10.52363/2522-1892.2021.2.1.

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The analysis of the environmental and human health threats imposed by phenols was conducted to show the need for further improvement of methods of their destruction. Being toxic in their initial composition and precursor to toxic metabolites in human body, phenols should be controlled in natural water and waste waters. They are listed as priority pollutants in most national regulation around the world and are the initial compounds for the formation of persistent organic pollutants in the environment, polluted with other active radicals. A variety of physical and chemical methods were offered f

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18

Malarczyk, Elzbieta. "Kinetic changes in activity of HR-peroxidase, induced by very low doses of phenol." International Journal of High Dilution Research - ISSN 1982-6206 7, no. 23 (2021): 48–55. http://dx.doi.org/10.51910/ijhdr.v7i23.37.

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The allosteric protein of horseradish peroxidase (HRP) shows two main types of activity, peroxidase and oxidase, depending on the kind of low molecular effectors. The effects of very low doses of phenol, prepared by successive dilutions in water or in 75% ethanol, on initial HRP activity in oxidation of o-dianisidine or luminol were tested in a systematic manner by colorimetric and luminometric methods. Results showed that phenol dilutions, including those below AvogadroÃƒÂ¢Ã¢â€šÂ¬Ã¢â€žÂ¢s number, could activate or inhibit HRP in peroxidase and oxidase type reactions with a sinusoidal pattern.

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19

Cheboi, Juliana J., Miriam G. Kinyua, Paul K. Kimurto, Oliver K. Kiplaga, Fredrick Ng’an’ga, and Sita R. Ghimire. "Biochemical composition of pigeonpea genotypes in Kenya." November 2019, no. 13(11):2019 (November 20, 2019): 1848–55. http://dx.doi.org/10.21475/ajcs.19.13.11.p1886.

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Pigeonpea is an important crop in semi-arid tropics and sub-tropics. The improvement and utilization of this crop in East Africa can enhance food and nutrition security. A study was carried out to examine variation in biochemical composition (crude protein, total phenols, total flavonoid and total anti-oxidant activity) of 55 pigeonpea genotypes grown in Kabete field station during the long rains of April-September 2017. The experiment was set up in a randomized complete block design with three replications. After harvest, 100g of dry seed samples were collected for biochemical analyses. The b

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20

Marlowe, Justin, Shreyas Acharya, Adam Zuber, and George Tsilomelekis. "Characterization of Sulfated SnO2-ZrO2 Catalysts and Their Catalytic Performance on the Tert-Butylation of Phenol." Catalysts 10, no. 7 (2020): 726. http://dx.doi.org/10.3390/catal10070726.

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Understanding the catalytic behavior of sulfated metal oxides has been the topic of several research studies in the past few decades. Their apparent super-acidic behavior has been correlated with the molecular structure of the surface sulfate species. Herein, we couple FTIR and Raman spectroscopies to study the molecular structural evolution of surface sulfate species on mixed metal hydroxides as well as calcined oxides. We show that on the surface of hydroxides, monodentate and possibly bidentate species are dominant, while for SnO2-rich samples, clusters of polymeric sulfate species may also

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21

Alsubaey, Aisha, Hugh D. Sisler, and Benjamin F. Matthews. "Purification and characterization of an extracellular phenol oxidase from culture filtrates of Pyricularia oryzae." Canadian Journal of Microbiology 42, no. 5 (1996): 437–45. http://dx.doi.org/10.1139/m96-060.

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Extracellular phenol oxidase activity was characterized and compared in Pyricularia oryzae wild-type and albino cell types to determine if this phenol oxidase was responsible for lack of melanization in the albino culture. Filtrates of the albino mutant Alb-5 showed activity similar to those of the wild type, while those of a buff mutant (Cp62) showed weak phenol oxidase activity. This indicated that the lack of melanization in the albino mutant was not due to an absence of phenol oxidase activity. The phenol oxidase isoform patterns from the wild type and two mutants were similar when analyze

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Toscano, Giuseppe, Maria Letizia Colarieti, and Guido Greco. "Oxidative polymerisation of phenols by a phenol oxidase from green olives." Enzyme and Microbial Technology 33, no. 1 (2003): 47–54. http://dx.doi.org/10.1016/s0141-0229(03)00080-2.

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23

Tanaka, Hiromi, Shuji Itakura, and Akio Enoki. "Phenol Oxidase Activity and One-Electron Oxidation Activity in Wood Degradation by Soft-Rot Deuteromycetes." Holzforschung 54, no. 5 (2000): 463–68. http://dx.doi.org/10.1515/hf.2000.078.

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Summary Wood degradation, one-electron oxidation activity as assayed by ethylene production from 2-keto-4-thiomethylbutyric acid, and phenol oxidase activity were measured in cultures of six deuteromycete fungi, with glucose or wood as the carbon source. The four fungi that degraded Japanese beech wood had higher one-electron oxidation activities in wood-containing cultures than in glucose-containing cultures. These four fungi also had measurable phenol oxidase activity in wood-containing cultures, but not in glucose-containing cultures. The two mould fungi that did not significantly degrade w

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Macías-Gallardo, Fabio, Tannia Alexandra Quiñones-Muñoz, Raúl Miranda-Avilés, Luis Felipe Ramírez-Santoyo, Gabriela Ana Zanor, and César Ozuna. "Impact of Organic Agriculture on the Quality of Grapes (Syrah and Tempranillo) Harvested in Guanajuato, Mexico: Relationship Between Soil Elemental Profile and Grape Bioactive Properties." Agriculture 15, no. 2 (2025): 169. https://doi.org/10.3390/agriculture15020169.

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Viticulture has migrated to organic management to reduce environmental impact. Grapes harvested in organic vineyards (ORGs) could have a better polyphenol profile than conventional vineyards (CONs). The objective was to evaluate the relationship between agricultural management, elemental soil profile, and grape bioactive compounds (var. Syrah and Tempranillo). Soil components were determined from CON and ORG vineyards; they were correlated with bioactive compounds in grape skin and seed through principal component analysis (PCA). The ORG vineyard presented higher moisture (4.50–5.72%), clay (3

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25

Shilpa, M., B. Manjunath, C. M. Sunil, Devaraja, Gayathri, and N. Nagaraju. "Enhancing Mungbean Resistance to Yellow Mosaic Virus: Insights from Biochemical Studies." Journal of Scientific Research and Reports 30, no. 7 (2024): 1100–1107. http://dx.doi.org/10.9734/jsrr/2024/v30i72258.

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Mungbean is one among the important and major pulse crop for supplementation of protein in subtropical zones of the world. Apart from providing protein in the diet, it also has the appreciable quality of helping the symbiotic root rhizobia by contributing to fix atmospheric nitrogen enriches the fertility of soil. Among the biotic factors, Mungbean yellow mosaic virus (MYMV) is the major bottleneck for pulse producers. The current study is aimed at estimation of biochemical enzymes like peroxidase, polyphenol oxidase, catalase, phenols and sugars contributing for resistance in mungbean genotyp

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Vlahos, C. J., W. F. Matter, R. F. Brown, et al. "Investigation of neutrophil signal transduction using a specific inhibitor of phosphatidylinositol 3-kinase." Journal of Immunology 154, no. 5 (1995): 2413–22. http://dx.doi.org/10.4049/jimmunol.154.5.2413.

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Abstract Neutrophils contain a multicomponent NADPH oxidase system that is involved in the production of microbicidal oxidants. Stimulation of human neutrophils with the peptide FMLP activates this respiratory burst enzyme to produce superoxide and also has been shown to result in activation of phosphatidylinositol (Ptdlns) 3-kinase. Treatment of human neutrophils with 2-(4-morpholinyl)-8-phenyl-4H-1-benzopyran-4-one (LY294002), a potent and specific inhibitor of Ptdlns 3-kinase, resulted in complete inhibition of Ptdlns 3-kinase activity as well as in inhibition of superoxide production in FM

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Atia, Alaa A., and Masanari Kimura. "Oxidative Hydroxylation of Aryl Boronic Acid Catalyzed by Co-porphyrin Complexes via Blue-Light Irradiation." Catalysts 10, no. 11 (2020): 1262. http://dx.doi.org/10.3390/catal10111262.

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Oxidative reactions often require unstable and environmentally harmful oxidants; therefore, the investigation of safer alternatives is urgent. Here, the hydroxylation of aryl boronic acid in the presence of Co-complexes is demonstrated. Tetrakis(4-carboxyphenyl) Co(II)-porphyrin was combined with biodegradable polymers such as chitosan catalyzed hydroxylation of phenyl boronic acids to form phenol derivatives under blue-light irradiation. This catalytic system can be used as an eco-friendly oxidation process that does not release oxidizing agents into the atmosphere.

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Valchuk, N. S., L. S. Bazhenova, and V. I. Vershinin. "Effect of foreign substances on the determination of phenols total content using single-wavelength and multi-wavelength UV-spectrometry." Аналитика и контроль 29, no. 1 (2025): 45. https://doi.org/10.15826/analitika.2025.29.1.002.

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The selectivity of spectrometric determination of toxic phenols total content (cΣ) was tested. Water solutions, simultaneously containing up to 5 different phenols, were analyzed by two methods, based on phenols conversion to certain azodyes under the action of diazotized sulfanilic acid (DSA). Method A included the measuring of generalized signal of phenols at 380 nm and estimation of cΣ in terms of phenol (C6H5OH). Method B included the measuring of generalized signals at 10 wavelengths in the range 360-410 nm and calculating of cΣ with inverted multivariate calibration. In the absence of fo

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Wengryniuk, Sarah E., and Xiao Xiao. "Recent Advances in the Selective Oxidative Dearomatization of Phenols to o-Quinones and o-Quinols with Hypervalent Iodine Reagents." Synlett 32, no. 08 (2021): 752–62. http://dx.doi.org/10.1055/s-0037-1610760.

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Abstract ortho-Quinones are valuable molecular frameworks with diverse applications across biology, materials, organic synthesis, catalysis, and coordination chemistry. Despite their broad utility, their synthesis remains challenging, in particular via the direct oxidation of readily accessible phenols, due to the need to affect regioselective ortho oxidation coupled with the sensitivity of the resulting o-quinone products. The perspective looks at the emergence of I(V) hypervalent iodine reagents as an effective class of oxidants for regioselective o-quinone synthesis. The application of thes

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Sun, De Dong, Huan Zheng, and Wen Ping Xue. "Oxidation of Phenol by Persulfate Activated with UV-Light and Ag⁺." Advanced Materials Research 610-613 (December 2012): 1806–9. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.1806.

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Phenol degradation with a UV/Ag+/K2S2O8 advanced oxidation process (AOP) was studied in a batch photolytic reactor. The UV irradiation source was a low-pressure mercury vapor lamp that was axially centered and was immersed in the phenol solution. In the UV/ K2S2O8 and Ag+/K2S2O8 system, the degradation of phenol was inefficient with an low concentration K2S2O8 at ambient temperature, and only around 26% and 23%of the phenol was degraded in 3 h , respectively. In the UV/Ag+/K2S2O8 oxidation process, persulfate (S2O82-) was activated by UV irradiation and Ag+ catalysis to produce powerful oxidan

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Lei, Lingyuan, Jing Zeng, Quanwei Liu, et al. "Effects of Soil Fauna on the Home-Field Advantage of Litter Total Phenol and Condensed Tannin Decomposition." Forests 15, no. 2 (2024): 389. http://dx.doi.org/10.3390/f15020389.

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Soil fauna play a vital role in contributing to the home-field advantage (HFA: litter decomposes faster in its natural habitat than elsewhere) during litter decomposition. Whether the presence of soil fauna affects the HFA of the decomposition of total phenols and condensed tannins, which are important components of litter, has rarely been investigated. In this study, litterbags with different mesh sizes were transplanted reciprocally, 0.04 mm (basically excluding soil fauna) and 3 mm (basically allowing all soil fauna to enter), in Lindera megaphylla and Cryptomeria fortunei forests. The resu

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Pentz, Ellen Steward, Bruce C. Black, and Theodore R. F. Wright. "A DIPHENOL OXIDASE GENE IS PART OF A CLUSTER OF GENES INVOLVED IN CATECHOLAMINE METABOLISM AND SCLEROTIZATION IN DROSOPHILA. I. IDENTIFICATION OF THE BIOCHEMICAL DEFECT IN Dox-A2 [l(2)37Bf] MUTANTS." Genetics 112, no. 4 (1986): 823–41. http://dx.doi.org/10.1093/genetics/112.4.823.

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ABSTRACT Phenol oxidase, a complex enzyme, plays a major role in the processes of sclerotization and melanization of cuticle in insects. Several loci have been reported to affect levels of phenol oxidase activity, but to date only one structural locus has been identified [Dox-3F (2-53.1+)]. Recently isolated Dox-A2 mutations (2-53.9) are recessive, early larval lethals, which as heterozygotes reduce phenol oxidase activity. A homozygous mutant escaper had weak, completely unpigmented cuticle and unpigmented bristles. Enzyme assays show that Dox-A2 heterozygotes have diphenol oxidase activity r

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Sukardi, Sukardi, Noer Iqbal Arief Iqbal, and Sri Winarsih. "Kajian Antioksidan, Total Fenol & Total Flavonoid Jamu Selokarang yang diformulasi dengan Jinten Hitam (Nigella sativa)." Food Technology and Halal Science Journal 4, no. 1 (2021): 39–51. http://dx.doi.org/10.22219/fths.v4i1.15623.

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Abstrcact Jamu Selokarang is one of the traditional drinks originating from an area, namely Madura, the ingredients used in the manufacture of Jamu Selokarang are turmeric, ginger, ginger, betel leaf, soursop leaves, cloves, nutmeg, coriander, temu ireng and ginger. The ingredients used in the manufacture of herbal medicine selokarang contain a lot of antioxidants and essential oils. Testing is needed to determine the antioxidant activity contained in the herbal medicine selokarang. This study aims to determine the effect of substitution of jamu selokarang on antioxidant compounds, total pheno

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Mogilnaya, O., N. Ronzhin, E. Posokhina, and V. Bondar. "ON THE SUBSTRATE SPECIFICITY AND SOME PROPERTIES OF THE EXTRACELLULAR OXIDASE FROM THE NEONOTHOPANUS NAMBI BASIDIOMYCETE." Russian Journal of Biological Physics and Chemisrty 8, no. 1 (2024): 71–77. http://dx.doi.org/10.29039/rusjbpc.2023.0591.

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An extracellular enzyme with oxidase activity was isolated from the mycelium of the higher fungus Neonothopanus nambi by mild treatment of the biomass with β-glucosidase. A substrate specificity and some properties of the isolated extracellular oxidase were studied in the present work. Experiments revealed that the extracellular oxidase exhibited activity with most phenolic compounds chosen as model substrates. It is important to note that the enzyme exhibited a catalytic function in the reactions without the addition of exogenous hydrogen peroxide and other mediators. The highest catalytic ac

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Subba, Bimala, Sarita Rijal, and Prabhat Kharel. "Study of antioxidant and xanthine oxidase inhibitory activities of Cascabela thevatia and Coriandrum sativum." Scientific World 18, no. 18 (2025): 135–42. https://doi.org/10.3126/sw.v18i18.78492.

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Two traditionally used medicinal plants, Cascabele. thevatia and Coriandrum sativum, were chosen for this investigation, and their bioactive components and xanthine oxidase inhibitory potential were examined. The phytochemical screening of the investigated plant leaf extracts revealed that these plants contain a wealth of secondary metabolites such as alkaloids, flavonoids, phenols, saponins, and terepenoids, among other things. Calculations of total phenol content (TPC) and total flavonoids content (TFC) values in plant extracts revealed that C. thevatia contained the greater values of TPC (7

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Macholán, Lumír. "Phenol-sensitive enzyme electrode with substrate cycling for quantification of certain inhibitory aromatic acids and thio compounds." Collection of Czechoslovak Chemical Communications 55, no. 9 (1990): 2152–60. http://dx.doi.org/10.1135/cccc19902152.

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A Clark oxygen electrode coated with a membrane of crosslinked champignon phenol oxidase (tyrosinase)is able to detect phenol containing analytical samples 3-5 times more sensitively after the admixture of hydrazine hydrochloride to the reaction buffer. This compound will recycle the substrate via chemical reduction of the quinoid product thus simultaneously preventing the membrane from rapid blackening. The decrease of oxygen in the membrane due to phenol oxidation is rapidly compensated by diffusion from the bulk solution when an inhibitor of the membrane-bound phenol oxidase is added to the

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T, Thiruveni. "MICROBIAL AND HERBIVORE INDUCED PHYTOCHEMICAL CHANGES IN OKRA AGAINST SHOOT AND FRUIT BORER, EARIAS VITTELLA (FAB.)." Journal of Biopesticides 5 (April 1, 2012): 223–27. https://doi.org/10.57182/jbiopestic.5.0.223-227.

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Microbial andherbivore induced phytochemical changes were studied in okra variety, Arkaanamika and hybrid, CoBhH1, againstshoot and fruit borer, Earias vittella. Induction was done either bymicrobial alone (microbial talc-based bioformulation Pseudomonas fluorescens(Pf1), Beauveria bassiana B2 isolate, Pf1+B2 consortia) or by bothmicrobial and herbivore (E. vittella infestation). Herbivore alone infestedplants served as infested control and undamaged plants left as absolutecontrol. Biochemical pathways encompassing induced resistance viz.,phenols and oxidizing defense enzymes such as peroxidas

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van Wyk, Juanita L., Selwyn Mapolie, Anders Lennartson, Mikael Håkansson, and Susan Jagner. "The Synthesis of Copper(II) Salicylaldiminato Complexes and their Catalytic Activity in the Hydroxylation of Phenol." Zeitschrift für Naturforschung B 62, no. 3 (2007): 331–38. http://dx.doi.org/10.1515/znb-2007-0305.

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The synthesis of copper(II) salicylaldiminato complexes and their application in the catalytic hydroxylation of phenol is reported. Tetracoordinated copper complexes (Cu(Ln)2) were obtained by reacting the N-phenylsalicylaldimine ligands (HL1 -HL7) with copper acetate in a 2 : 1 mole ratio. The reaction of N-(2,6-diisopropyl)phenyl-3,5-di-tert-butylsalicylaldimine (HL7) with copper acetate in a 1 : 1 mole ratio afforded a dinuclear complex, which was not obtained with the other ligand systems. All complexes were characterized using FT-IR and elemental analysis. X-Ray crystal structures of comp

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Liu, Zhangpei, Maosheng Qian, Xiaomeng Cheng, and Zhiming Liu. "Recent Advances in the Photocatalytic Degradation of Phenol over Bi-Based Oxide Catalysts." Processes 12, no. 9 (2024): 1799. http://dx.doi.org/10.3390/pr12091799.

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Wastewater containing phenolic organic compounds, such as phenol, produced during industrial manufacturing processes, poses a significant threat to aquatic ecosystems and crops. Photocatalytic technology is considered the most promising approach to water treatment due to its efficiency and eco-friendly advantages. Compared to other photocatalysts, Bi-based oxides are more efficient due to their unique layered structure, which allows for photocatalytic reactions to occur between layers. This review introduces the synthesis methods of various bismuth-based multi-element oxides and their efficien

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Rahaman, Md Motiur, Rebecca S. Zwart, and John P. Thompson. "Constitutive and Induced Expression of Total Phenol and Phenol Oxidases in Wheat Genotypes Ranging in Resistance/Susceptibility to the Root-Lesion Nematode Pratylenchus thornei." Plants 9, no. 4 (2020): 485. http://dx.doi.org/10.3390/plants9040485.

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Plant-derived phenolic compounds contribute to the defense against various pathogens, including root-lesion nematodes (Pratylenchus spp.). However, there are no reports on the role of phenolic compounds in wheat (Triticum aestivum) against Pratylenchus thornei. In this study, wheat genotypes ranging from resistant to very susceptible to P. thornei were used to investigate the level of total phenols and phenol oxidases, polyphenol oxidase (PPO), and peroxidase (POD) expressed in root tissues when grown in the presence and absence of P. thornei over time (2–8 weeks). Higher constitutive levels o

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Park, Saerom, Sungjik Oh, and Ilho Kim. "Role of Borate Buffer in Organic Degradation by Peroxymonosulfate in the Presence of Metal Oxides." Water 13, no. 19 (2021): 2698. http://dx.doi.org/10.3390/w13192698.

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The effects of borate ions on the reactivity of peroxymonosulfate (PMS) during organic degradation in the presence of metal oxides were examined. The metal oxides exhibited catalytic abilities for the degradation of carbamazepine (CBZ) but not for phenol (PN). Scavenging experiments revealed the absence of radical generation during PN degradation in the presence of the various metal oxides and borate buffer. This indicated that the borate buffer hindered the catalytic abilities of the metal oxides for producing radicals via the PMS oxidant, especially during the faster degradation of compounds

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Kojevnikov, Dmitry N., Eugeny N. Ulomsky, Vladimir L. Rusinov, Oleg N. Chupakhin та Hans Neunhoeffer. "Stable σ-adducts of 6-phenyl-1,2,4-triazine 4-oxides with phenols". Mendeleev Communications 7, № 3 (1997): 116–17. http://dx.doi.org/10.1070/mc1997v007n03abeh000701.

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Taher, I. E., and S. N. Ami. "Inducing systemic acquired resistance (SAR) against root-knot nematode Meloidogyne javanica and evaluation of biochemical changes in cucumber root." Helminthologia 59, no. 4 (2022): 404–13. http://dx.doi.org/10.2478/helm-2022-0042.

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Summary For inducing systemic acquired resistance (SAR), Salicylic acid (SA), Ascorbic acid (AA), and silicon (Si) were applied on shoots, roots, and both of them simultaneously. Results showed that all treatments reduced the number of galls, root gall index, number of egg mass/root system, number of nematodes/root system, number of eggs/root system, number of nematodes/pot soil, the final population density of nematodes, and rate of reproduction. Treatments also increased growth criteria, including chlorophyll, shoot fresh weight, root fresh weight, shoots dry weight, root dry weight, shoots

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Ovejero, G., J. L. Sotelo, F. Martínez, and L. Gordo. "Novel heterogeneous catalysts in the wet peroxide oxidation of phenol." Water Science and Technology 44, no. 5 (2001): 153–60. http://dx.doi.org/10.2166/wst.2001.0275.

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Catalytic wet peroxide oxidation (CWPO) of diluted aqueous solutions of phenol has been studied over a series of heterogeneous catalysts at 100°C under 1MPa air pressure. Several catalysts were prepared and tested including zeolitic materials exchanged with metallic ions such as Fe and Cu and different mixed oxides. Likewise, a Fe-TS- zeolite was synthesised by isomorphous substitution of Si atoms by Fe and Ti into the MFI zeolitic framework through hydrothermal synthesis of wetness-impregnated Fe2O3-TiO2-SiO2 xerogels. This material showed a complete phenol removal and TOC reduction of up to

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Gouka, Robin J., Monique van der Heiden, Ton Swarthoff, and C. Theo Verrips. "Cloning of a Phenol Oxidase Gene fromAcremonium murorum and Its Expression inAspergillus awamori." Applied and Environmental Microbiology 67, no. 6 (2001): 2610–16. http://dx.doi.org/10.1128/aem.67.6.2610-2616.2001.

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ABSTRACT Fungal multicopper oxidases have many potential industrial applications, since they perform reactions under mild conditions. We isolated a phenol oxidase from the fungus Acremonium murorum var. murorum that was capable of decolorizing plant chromophores (such as anthocyanins).This enzyme is of interest in laundry-cleaning products because of its broad specificity for chromophores. We expressed an A. murorum cDNA library in Saccharomyces cerevisiae and subsequently identified enzyme-producing yeast colonies based on their ability to decolor a plant chromophore. The cDNA sequence contai

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B., THIMME GOWDA, JAGAN MOHANA RAO P., and DARLIN QUINE S. "Kinetics and Mechanism of Bromination of Phenol and Substituted Phenols by N-Bromobenzamide in Aquo-acetic Acid Medium." Journal of Indian Chemical Society Vol. 69, Dec 1992 (1992): 830–34. https://doi.org/10.5281/zenodo.6032293.

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Department of Post-Graduate Studies and Research in Chemistry, Mangalore University, Mangalagangothri-574 199 <em>Manuscript received 2 December 1991, revised 24 August 1992, accepted 24 September 1992</em> Kinetics of bromination of phenol and substituted phenols by <em>N</em>-b-omobenzamide <em>have </em>been studied in aquo-acetic acid (1 : 1, v/v) medium. The rates of bromination show first order kinetics in [NBB], fractional order in [phenols] and zero order in [H<sup>+</sup>]. The rate slightly decreases with the addition of the reduced product of the oxidant, while the increase in aceti

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47

B., THIMME GOWDA, JAGAN MOHANA RAO P., and DARLIN QUINE S. "Kinetics and Mechanism of Bromination of Phenol and Substituted Phenols by N-Bromobenzamide in Aquo-acetic Acid Medium." Journal of Indian Chemical Society Vol. 69, Dec 1992 (1992): 830–34. https://doi.org/10.5281/zenodo.6116677.

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Department of Post-Graduate Studies and Research in Chemistry, Mangalore University, Mangalagangothri-574 199 <em>Manuscript received 2 December 1991, revised 24 August 1992, accepted 24 September 1992</em> Kinetics of bromination of phenol and substituted phenols by <em>N</em>-bromobenzamide <em>have </em>been studied in aquo-acetic acid (1 : 1, v/v) medium. The rates of bromination show first order kinetics in [NBB], fractional order in [phenols] and zero order in [H<sup>+</sup>]. The rate slightly decreases with the addition of the reduced product of the oxidant, while the increase in aceti

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48

Garrido, Inmaculada, José Luis Llerena, María Esperanza Valdés, et al. "Effects of defoliation and water restriction on total phenols and antioxidant activities in grapes during ripening." OENO One 48, no. 1 (2014): 31. http://dx.doi.org/10.20870/oeno-one.2014.48.1.1654.

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<p style="text-align: justify;"><strong>Aim</strong>: To compare the effect of water restriction and defoliation on the phenol contents and oxidant and antioxidant activities of Tempranillo grapes grown in the region of Extremadura, Spain.</p><p style="text-align: justify;"><strong>Methods and results</strong>: The results showed that at harvest, the water restriction treatment altered total foliar area, pH, and total soluble solid (TSS) and phenol contents but not polyphenol oxidase (PPO) and superoxide dismutase (SOD) activities. By contrast, the def

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Kravchenko, Elena Mikhailovna, Svetlana Ivanovna Demchenko, and Ivan Dmitrievich Odaryuk. "A COMPLEX APPROACH TO THE ASSAY OF OXIDASE AND PEROXIDASE ACTIVITY OF THE SOLID-STATE CULTURE OF PLEUROTUS OSTREATUS HK-35." Chemistry of plant raw material, no. 2 (June 14, 2025): 300–310. https://doi.org/10.14258/jcprm.20250215908.

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The aim of this work is to develop the method to assay activity of laccase and peroxidase in plant and fungal extracts. We use laccase from Trametes versicolor and peroxidase from Armoracia rusticana as model enzymes to select the optimal conditions and to get the kinetic data by spectrophotometrical method. The approach was tested on assay the laccase and peroxidase activity in protein precipitate, isolated from aqueous extract of mycelial-sybstrate complex (solid-state culture) of Pleurotus ostreatus, strain HK-35. Meaning the different substrate specifity of isoenzymes in natural objects, u

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Ashwini, Appaji Mahesh, Latha Puttarudrappa, Ravi Kumar, and Mala Majumdar. "GC-MS analysis, evaluation of phytochemicals, anti-oxidant, thrombolytic and anti-inflammatory activities of Exacum bicolor." Bangladesh Journal of Pharmacology 10, no. 4 (2015): 745. http://dx.doi.org/10.3329/bjp.v10i4.23610.

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<p class="Abstract">The aim of the present study was to investigate the GC-MS analysis, phytochemical screening, anti-oxidant, thrombolytic and anti-inflammatory activities of methanol extract of leaves of Exacum bicolor. FTIR analysis confirmed the presence of alcohol, phenols, alkanes, aromatic compounds, aldehyde and ethers. GC-MS analysis revealed the presence of eight phyto-constituents. The total phenol, flavonoid and alkaloid contents were 18.0 ± 0.2 mg/GAE/g, 13.1 ± 0.4 mg QE/g and 108.0 ± 1.2 mg AE/g respectively. The DPPH assay exhibited potent anti-oxidant abilities with IC&lt

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