Enzymatic Catalysis
Mostrando 1-12 de 119 artigos, teses e dissertações.
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1. IMIDAZOL E CATÁLISE: UM PAR PERFEITO
The imidazole (IMZ) ring presents several chemical properties that turns it into a versatile acid-basic/nucleophilic catalyst. The discovery of the biological properties of histidine (amino acid with IMZ ring) instigates the study of this class of compounds. It is found in nature in several enzymes such as chymotrypsin and RNAses due to these properties. Thi
Quím. Nova. Publicado em: 2021-03
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2. FATTY ACID ETHYL ESTERS FROM MICROALGAE OF Scenedesmus ecornis BY ENZYMATIC AND ACID CATALYSIS
Microalgae are an indispensable food source for the various growth stages of mollusks, crustaceans, and several fish species. Using a microalgae biomass present in the Amazonian ecosystem (Macapá-AP), we study extraction methods for fatty acid such as solvent extraction (magnetic stirring and/or Soxhlet) and/or hydrolysis (acid and/or enzymatic catalysis) f
Quím. Nova. Publicado em: 2018-01
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3. Multifunctional Imidazole-Derived Polymeric Catalyst for Dephosphorylation Reactions Potentiated by Cationic and Anionic Micelles
Results confirm the catalytic potential of imidazole groups anchored on the polymeric backbone of polyvinylimidazole (PVI) in dephosphorylation reactions with di- and tri-phosphoesters, promoting impressive enhancements up to 107-fold. We propose the imidazole groups on PVI react by nucleophilic catalysis (neutral specie) with a phosphate triester and bifunc
J. Braz. Chem. Soc.. Publicado em: 2016-02
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4. Bifunctional Porous SiO2 Complex Nanoparticles with Properties of Enzymatic Catalysis and Optical Oxygen Sensing
The porous fluorescent SiO2 nanoparticles encapsulating photosensitizer Ru(bpy)3Cl2were prepared by Stöber method and used as a carrier to immobilize glucose oxidase (GOD) to form the bifunctional porous SiO2 complex nanoparticles (BPSCNp) with the properties of enzymatic catalysis and optical oxygen sensing. The optimal immobilization conditions are as fol
J. Braz. Chem. Soc.. Publicado em: 2015-09
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5. Conversion of by-products from the vegetable oil industry into biodiesel and its use in internal combustion engines: a review
Biodiesel produced from by-products and waste materials can be an economical way of reducing traditional oil consumption and environmental problems. The by-products from the vegetable oil refining industry such as soapstock, acid oil and fatty acid distillates are suitable for producing biodiesel. The present work is a survey related to the use of these by-p
Braz. J. Chem. Eng.. Publicado em: 2014-06
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6. Potencialidades do ácido 4-[(1E)etanohidrazonoil]benzóico como biomimético para a esterase da acetiltiocolina / Potencialities of [4-(1E)ethanehydrazonoyl]benzoic acid as a biomimetic for acetylthiocholine esterase
The application of pesticides and the resulting contamination have been a matter of constant concern, being necessary to monitor these compounds by methods that are able to quantify these compounds in water and food. The chromatographic techniques are most often used for this kind of analysis, but present some drawbacks for \"in situ\" or in real time applic
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/02/2012
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7. Pré-tratamento organossolve do bagaço de cana-deaçúcar para a produção de etanol e obtenção de xilooligômeros
Sugarcane bagasse is an abundant lignocelulosic byproduct, due to the high ethanol production from sugarcane juice, which turns this residue an attractive alternative for obtaining cellulosic ethanol and other products of higher value added. However, the use of bagasse requires a pre-treatment step for better use of its fractions. It was proposed in this stu
Publicado em: 2011
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8. Produção de monoéster via etanólise por hidrotalcitas termoativadas : síntese e caracterização
Among biofuels of the 1st generation, biodiesel stands out for its equivalent features to those of mineral diesel, however less polluting. It can be obtained by transesterification of triglyceride fats or vegetable oils by (m)ethanolysis. Aiming at improving the chemical process, different types of catalysis have been studied: i) homogeneous (acid e.g. H2SO4
Publicado em: 2011
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9. Evaluation of activated vegetal charcoal and vegetal polymer on the detoxification of the sugarcane hemicellulosic hydrolysate for biotechnological production of xylitol / Avaliação do carvão vegetal ativado e polímero vegetal na destoxificação do hidrolisado hemicelulósico de bagaço de cana-de-açúcar para a produção biotecnológica de xilitol
The increasing search for ethanol fuel in order to reduce the dependence and to promote the substitution of fossil fuels will contribute to higher accumulation of sugarcane bagasse in the environment. This biomass that in Brazil is a by-product of the sugar-alcohol mills, although it has been used for the generation of energy in the sugar and alcohol product
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/04/2010
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10. Proteoliposomes as matrix vesicles' biomimetics to study the initiation of skeletal mineralization
During the process of endochondral bone formation, chondrocytes and osteoblasts mineralize their extracellular matrix by promoting the formation of hydroxyapatite (HA) seed crystals in the sheltered interior of membrane-limited matrix vesicles (MVs). Ion transporters control the availability of phosphate and calcium needed for HA deposition. The lipidic micr
Brazilian Journal of Medical and Biological Research. Publicado em: 2010-03
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11. Evaluation of lipases in the desymmetrization of meso-exo-3,5-dihydroxymethylenetricyclo [5.2.1.02,6] decane and the synthesis of chiral derivatives
A dessimetrização mais eficiente do composto meso-exo-3,5-dihidroximetilenotriciclo[ 5.2.1.02,6]decano foi com a lipase da Pseudomonas cepacia (PS–C ‘Amano’ II) em acetato de vinila, quando obteve-se alto rendimento químico (93%) e excelente excesso enantiomérico (ee ³ 99%), determinado por cromatografia gasosa em coluna quiral. Desse sistema quir
Publicado em: 2010
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12. Study of kinetic resolution of secondary alcohols by enantioselective oxidation mediated by bacteria / Estudo de resolução cinética de álcoois secundários utilizando reação de oxidação enantiosseletiva mediada por bactérias
Nesta dissertação de mestrado foram estudadas duas bactérias, Sphingobacterium sp e Arthrobacter atrocyaneus, produtoras de enzimas álcool desidrogenases que se mostraram capazes de catalisar reações de oxidação enantiosseletiva de alcoóis secundários racêmicos. Inicialmente foram avaliados alguns parâmetros para a realização da resolução cin
Publicado em: 2010