Glyoxal
Mostrando 1-12 de 60 artigos, teses e dissertações.
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1. Desenvolvimento de filmes à base de proteínas extraídas da torta de mamona (Ricinus communis L.) reticuladas com glutaraldeído e glioxal / Development of films based on proteins extracted from the castor bean cake (Ricinus communis L.) crosslinked with glutaraldehyde and glyoxal
O processo de extração do óleo de mamona gera, como subproduto, uma torta rica em proteínas, que tem sido utilizada como adubo e contra fitonematóide, devido à sua toxicidade. Entretanto, as proteínas da torta de mamona são ricas em aminoácidos que permitem modificação química com aldeídos bifuncionais, como o glutaraldeído e o glioxal, o que p
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/04/2012
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2. Determination of cinnamic acid in human urine by flow injection chemiluminescence
It was found that cinnamic acid can react with potassium permanganate in the acidic medium and produce chemiluminescence, which was greatly enhanced by glyoxal. Under the optimum conditions, the linear range for the determination of cinnamic acid was 1.0×10-8 to 1.0×10-4 mol L-1 with a detection limit of 8.0×10-9 mol L-1, the relative standard deviation w
Química Nova. Publicado em: 2011
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3. Biocomposites of lignin-, tannin- and glyoxal- based polymeric matrices reinforced with natural fibers / Biocompósitos a partir de matrizes poliméricas baseadas em lignina, tanino e glioxal reforçadas com fibras naturais
The present study aimed at developing biocomposites combining polymeric matrices and reinforcement agents, employing the highest possible proportion of materials obtained from natural sources. Phenolic resins are widely known and used due to their excellent properties, such as dimensional and thermal stability, flame resistance and chemical resistance. Howev
Publicado em: 2010
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4. Imobilização da lacase em micropartículas de quitosana obtidas por spray drying e usadas na construção de biossensores
Biosensors based on laccase immobilized on microparticles of chitosan crosslinked with tripolyphosphate (biosensor I) and glyoxal (biosensor II) obtained by spray drying for the determinations of rutin in pharmaceutical formulations were developed. Under optimized operational conditions (pH 4.0, frequency of 30 Hz, pulse amplitude of 40 mV and scan increment
Química Nova. Publicado em: 2009
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5. Properties of chemically modified gelatin films
Edible and/or biodegradable films usually have limited water vapor barriers, making it difficult to use them. Thus, the objective of this work was to evaluate the effect of a chemical reticulation treatment with formaldehyde and glyoxal on the mechanical properties, water vapor permeability, solubility and color parameters of gelatin-based films. Formaldehyd
Brazilian Journal of Chemical Engineering. Publicado em: 2006-03
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6. The application of glyoxal-bis-(2-hydroxyanil) to the determination of trace amounts of cadmium by spectrofluorimetry
A reação fluorescente do glioxal-bis-(2-hidroxianil) (GBHA) com cádmio foi estudada. A partir dessa reação quelante, um método espectrofluorimétrico direto, sensível e rápido, para determinação de traços de cádmio com GBHA, foi desenvolvido. As condições reacionais para o sistema fluorescente de cádmio com GBHA foram estabelecidas. O íon cá
Journal of the Brazilian Chemical Society. Publicado em: 2006-02
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7. Glyoxal, a major product of DNA oxidation, induces mutations at G:C sites on a shuttle vector plasmid replicated in mammalian cells.
Glyoxal is a major product of DNA oxidation in which Fenton-type oxygen free radical-forming systems are involved. To determine the mutation spectrum of glyoxal in mammalian cells and to compare the spectrum with those observed in other experimental systems, we analyzed mutations in a bacterial suppressor tRNA gene (supF) in the shuttle vector plasmid pMY189
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8. Factors controlling the competition among rotational and vibrational energy transfer channels in glyoxal
The state-to-state transfer of rotational and vibrational energy has been studied for S1 glyoxal (CHOCHO) in collisions with D2, N2, CO and C2H4 using crossed molecular beams. A laser is used to pump glyoxal seeded in He to its S1 zero point level with zero angular momentum about its top axis (K′ = 0). The inelastic scattering to each of at least 26 S1 gly
The National Academy of Sciences of the USA.
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9. Cloning and characterization of cDNA encoding glyoxal oxidase, a H2O2-producing enzyme from the lignin-degrading basidiomycete Phanerochaete chrysosporium.
Glyoxal oxidase is produced by ligninolytic cultures of the white-rot fungus Phanerochaete chrysosporium and is a source of the extracellular H2O2 that is required by ligninolytic peroxidases. We report here the cloning and characterization of glx-1c cDNA, which encodes glyoxal oxidase. The deduced mature protein has 537 amino acids, a molecular size of 57 k
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10. A new method of DNA denaturation mapping.
Described is a new method for DNA denaturation mapping utilizing glyoxal (ethanedial) to stabilize the denatured regions. The extent of glyoxal reaction can be easily and sensitively measured using an assay based on the intercalation of ethidium into duplex DNA. Thus denturation maps can be produced in a controlled way under a wide variety of conditions.
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11. Overproduction of lignin-degrading enzymes by an isolate of Phanerochaete chrysosporium.
Phanerochaete chrysosporium is a white rot fungus which secretes a family of lignin-degrading enzymes under nutrient limitation. PSBL-1 is a mutant of this organism that generates the ligninolytic system under nonlimiting conditions during primary metabolism. Lignin peroxidase, manganese peroxidase, and glyoxal oxidase activities for PSBL-1 under nonlimiting
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12. Interaction of glyoxal and methylglyoxal with biogenic amines.
Glyoxal and methylglyoxal interact with biogenic amines and form biologically active free radicals. Electron spin resonance absorption of the radical at room temperature is characterized by a signal at g equals 2.004 with peak-to-peak width of 29 G. An optical absorption at 400 nm with molar absorptivity of 23,000 accompanies the formation of the radical. Th