Tyrosinase Enzyme
Mostrando 1-12 de 55 artigos, teses e dissertações.
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1. Silica/Titania Graphite Composite Modified with Chitosan and Tyrosinase Employed as a Sensitive Biosensor for Phenolic Compounds
A mesoporous, high surface area and conductive silica/titania graphite composite modified with chitosan and functionalized with tyrosinase was prepared. The composite was obtained by the sol-gel method and the surface of the resultant material was modified with chitosan solutions containing 5, 10 and 15% by mass. The textural characterization showed that eve
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
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2. Enzyme activity and biochemical changes during production of Lentinula edodes (Berk.) Pegler
Abstract Shiitake is an important edible and medicinal mushroom cultivated worldwide. Its cultivation involves a complex process of browning that precedes the primordia initiation. The present work through the evaluation of enzymes, lectin and β-glucan during the cultivation cycle of Lentinula edodes, the degradation of cellulose, hemicellulose and lignin,
Food Sci. Technol. Publicado em: 07/01/2019
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3. Enzyme activity and biochemical changes during production of Lentinula edodes (Berk.) Pegler
Abstract Shiitake is an important edible and medicinal mushroom cultivated worldwide. Its cultivation involves a complex process of browning that precedes the primordia initiation. The present work through the evaluation of enzymes, lectin and β-glucan during the cultivation cycle of Lentinula edodes, the degradation of cellulose, hemicellulose and lignin,
Food Sci. Technol. Publicado em: 20/12/2018
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4. Chemo-Preventive Functions of Grape Seed Proanthocyanidin Extract against UV-Induced Intracellular Oxidative Stress and Tyrosinase Activity
Clinical studies have identified that an excessive exposure of UV light can cause oxidative stress (OS) and tyrosinase enzyme over-expression, which are associated with multiple diseases including atherosclerosis, cancers, diabetics, rheumatoid arthritis. In this study, we investigated the impact of grape seed proanthocyanidin (GSPE) on regulating OS and tyr
J. Braz. Chem. Soc.. Publicado em: 2018-08
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5. Simultaneous Determination of Different Phenolic Compounds Using Electrochemical Biosensor and Multivariate Calibration
Phenolic compounds are important environmental contaminants due to their high toxicity and persistence in the environment. The use of enzyme-based electrochemical biosensors is a simple, sensitive and low-cost alternative for the determination of these pollutants in contaminated waters. However, in most cases, it is impossible to detect specific compounds in
J. Braz. Chem. Soc.. Publicado em: 2018-03
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6. Effects of Acmella oleracea methanolic extract and fractions on the tyrosinase enzyme
Abstract The aim of the current study is to evaluate the effect of Acmella oleracea (L.) R.K. Jansen, Asteraceae, methanolic extract, hexane (84.28% spilanthol) and dichloromethane (approximately 100% spilanthol) fractions on the tyrosinase enzyme. The dehydrated jambu extract was obtained through maceration using methanol. The extract residue was solubilize
Rev. bras. farmacogn.. Publicado em: 2016-06
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7. BIOSSENSOR ELETROQUÍMICO BASEADO NA ENZIMA TIROSINASE PARA A DETERMINAÇÃO DE FENOL EM EFLUENTES
AbstractThis work describes the development of a biosensor based on the tyrosinase enzyme (Tyr) for the determination of phenol (PHEN) in laboratory effluent samples derived from ammoniacal nitrogen analysis of the water samples from the Muquém dam in the city of Cariús, CE, using square-wave voltammetry (SWV). The electrode modification consisted of the i
Quím. Nova. Publicado em: 2015-08
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8. A new enzymatic process for the treatment of phenolic pollutants
This work aimed to develop a new economic enzymatic process to treat the phenolic pollutants using pure tyrosinase in stirred vessel and adopting temperature (T), pH, rotational speed (N), initial phenol (C P,o) and enzyme (C T) concentrations as independent variables. Experimental data of the residual phenol concentration (C P) were used to calculate the ox
Braz. arch. biol. technol.. Publicado em: 2013-08
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9. Molecular characterization of the polyphenol oxidase gene in lulo (Solanum quitoense Lam.) var. Castilla
Lulo (Solanum quitoense Lam.) is an exotic fruit from the Andes Mountains with a high export potential. However, the browning that is produced during harvest and the postharvest processes alters the organoleptic and nutritional properties of this fruit, which has made its management as a fresh fruit difficult. The browning processes are regulated by the enzy
Braz. J. Plant Physiol.. Publicado em: 2012-12
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10. Production and characterization of tyrosinase activity in Pycnoporus sanguineus CCT-4518 crude extract
Tyrosinase is an enzyme of industrial interest. The production and characterization of tyrosinase from P. sanguineus CCT-4518 were investigated. The selection of inductors, luminosity influence, inoculum size and type of culture medium on the production of tyrosinase and the effect of inhibitors on enzyme activity were performed. Optimum conditions for intra
Brazilian Journal of Microbiology. Publicado em: 2012-03
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11. Estudo da remoção de fenóis de soluções aquosas através da adsorção em quitosana, degradação enzimática por tirosinase e imobilização de tirosinase em matriz de quitosana / Study of the removal of phenols from aqueous solution through adsorpition by quitosan by tyrosinase enzyme degradetion and inmobilization of tyrosinase in chitosan matrix
This paper presents the study of biotechnology processes for the removal of pHenol from aqueous solution in batch reactor in 3 separate cases (A), (B) and (C) respectively. As they adsorption of pHenols from aqueous solutions on chitosan, enzymatic degradation of pHenols by tyrosinase in aqueous solution and adsorption / degradation of pHenols in aqueous sol
Publicado em: 2010
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12. Produção e caracterização da atividade de tirosinase no extrato bruto de Pycnoporus sanguineus CCT-4518 / Production and characterization of tyrosinase activity in Pycnoporus sanguineus CCT-4518 crude extract
Tyrosinase (E.C.1.14.18.1) is an enzyme of industrial interest that catalyses the ohydroxylation of monophenols (monophenolase activity) and the oxidation of o-diphenols to reactive o-quinones (diphenolase activity), both reactions using molecular oxygen. Pycnoporus sanguineus (L. ex Fries) Murril, is a white rot fungi capable of producing tyrosinase and wid
Publicado em: 2009