Results 151 to 160 of about 11,695 (199)

Laccase and tyrosinase activities in lichens

Microbiology, 2006
Phenoloxidase activity was found in lichenized ascomycetes belonging to different taxonomic groups. Most of the epigeic and epilithic lichens of the order Peltigerales were found to possess both laccase and tyrosinase activities; the lichens of the order Lecanorales possessed only laccase activity, which was an order of magnitude lower than that of ...
A G, Zavarzina, A A, Zavarzin
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Automated chromatographic laccase-mediator-system activity assay

Analytical and Bioanalytical Chemistry, 2017
To study the interaction of laccases, mediators, and substrates in laccase-mediator systems (LMS), an on-line measurement was developed using high performance anion exchange chromatography equipped with a CarboPac™ PA 100 column coupled to pulsed amperometric detection (HPAEC-PAD). The developed method was optimized for overall chromatographic run time
Nico Anders, Maximilian Schelden, Simon Roth, Antje C. Spiess   +3 more
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Screening Metagenomic Libraries for Laccase Activities

2010
Laccases are multi-copper oxidoreductases (benzenediol:oxygen oxidoreductases, EC 1.10.3.2) able to oxidise a wide variety of phenolic and non-phenolic compounds. They are useful enzymes for a variety of applications, including bioremediation and craft pulp bio-bleaching as the most significant ones.
Manuel, Ferrer, Ana, Beloqui, Peter N, Golyshin   +2 more
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Fungal laccase: properties and activity on lignin

Journal of Basic Microbiology, 2001
The sources of ligninocellulose that occur in various forms in nature are so vast that they can only be compared to those of water. The results of several, more recent experiments showed that laccase probably possesses the big ability for "lignin-barrier" breakdown of ligninocellulose.
A, Leonowicz, N S, Cho, J, Luterek, A, Wilkolazka, M, Wojtas-Wasilewska, A, Matuszewska, M, Hofrichter, D, Wesenberg, J, Rogalski   +8 more
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Laccase activity measurement by FTIR spectral fingerprinting

Enzyme and Microbial Technology, 2019
Laccases (EC 1.10.3.2) are enzymes known for their ability to catalyze the oxidation of phenolic compounds using molecular oxygen as the final electron acceptor. Laccase activity is commonly determined by monitoring spectrophotometric changes (absorbance) of the product or substrate during the enzymatic reaction. Fourier Transform Infrared Spectroscopy
Valentina Perna, Andreas Baum, Heidi A. Ernst, Jane W. Agger, Anne S. Meyer   +4 more
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Mechanism of the salt activation of laccase Lac15

Biochemical and Biophysical Research Communications, 2020
Laccases (benzenediol: oxygen oxidoreductases, EC1.10.3.2) can oxidize various substrates, and those which are tolerant to and even activated by salts have attracted a lot of attention due to their application potential in certain industries. The mechanism of the salt activation of laccases is awaiting to be elucidated yet.
Zhi Li, Sha Jiang, Yanan Xie, Zemin Fang, Yazhong Xiao, Wei Fang, Xuecheng Zhang   +6 more
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Catalytic activity of laccase hosted in reversed micelles

Journal of Bioscience and Bioengineering, 2001
Nanostructured reversed micelles induce a high laccase activity in organic solvents, because enzymes can maintain their highly dimensional structure in water pools of reversed micelles [RMs]. Laccase attracts considerable attention as a novel industrial enzyme due to its high capability to catalyze the oxidation of aromatic compounds.
J, Michizoe, M, Goto, S, Furusaki
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Laccase activity of forest litter

Soil Biology and Biochemistry, 1999
Abstract Laccases are blue-copper enzymatic proteins involved in the transformation of polyphenolic compounds, such as lignin, into forest litter. A method to measure their activity was developed using an evergreen oak litter as a model system. We considered factors that affect the extraction of these enzymes and the measurement of their activity ...
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Antioxidant activity assay based on laccase-generated radicals

Analytical and Bioanalytical Chemistry, 2008
A novel antioxidant activity assay was developed using laccase-oxidized phenolics. In a three-step approach, phenolic compounds were first oxidized by laccase. Laccase was then inhibited using 80% (v/v) methanol which also stabilized the oxidized phenolics which were then used to measure antioxidant activities of ascorbic acid and Trolox. From a number
Endry, Nugroho Prasetyo, Tukayi, Kudanga, Walter, Steiner, Michael, Murkovic, Gibson S, Nyanhongo, Georg M, Guebitz   +5 more
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Laccase Inhibiting Activity of Some Coumarin Derivatives

Letters in Organic Chemistry, 2014
Seven coumarin derivatives were screened for their inhibitory effect on laccase utilizing ABTS and L- DOPA as substrates. 2-[(4-Methyl-2-oxo-2H-1- benzopyran-7-yl)oxy]acetic acid (E)-2- [(dihydroxyphenyl)methylene]hydrazides were proven to be stronger inhibitors than corresponding thiosemicarbazides when ABTS [2, 2'-azinobis(3- ethylbenzothiazoline-6 ...
Tišma, Marina, Molnar, Maja, Škarica, Marija, Čačić, Milan, Zelić, Bruno   +4 more
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