Enantiomeric Purity
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Processos biocatalÃticos utilizando a casca da laranja da terra (Citrus aurantium L.) / Biocatalytic processes using the orange peel of the earth (Citrus aurantium L.)
O Brasil à o maior produtor mundial de laranja e de suco de laranja, sendo este setor de grande importÃncia para economia brasileira, responsÃvel por gerar mais de 400 mil empregos e movimentar cifras de bilhÃes de reais por ano. Mas, este setor tambÃm à responsÃvel pela produÃÃo de grande quantidade de rejeitos industriais, que equivalem a 50% do p
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/01/2012
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2. ISOLAMENTO, CARACTERIZAÇÃO, QUANTIFICAÇÃO E AVALIAÇÃO DA PUREZA ENANTIOMÉRICA DE LINALOL, CARVONA E LIMONENO EM ÓLEOS ESSENCIAIS DE ESPÉCIES AROMÁTICAS. / ISOLATION, CHARACTERIZATION, AND EVALUATION OF MEASUREMENT ENANTIOMERIC PURITY OF LINALOOL, CARVONE AND LIMONENE IN ESSENTIAL OILS HERBS SPECIES.
Este estudo envolveu isolamento, caracterização, quantificação e avaliação da pureza enantiomérica do linalol nos óleos essenciais das espécies aromáticas Lippia alba (Mill.) N. E. Brown (quimiotipo linalol-1,8-cineol), Ocimum basilicum L, Pelargonium graveolens LHerit, Cinnamomum camphora Nees e Eberm var. linaloolifera Fujita, Aniba rosaeodora Du
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/12/2011
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3. Biorreciclagem de hexano e estudo de reações de óxido-redução usando plantas comestíveis / Biorecycling of hexane and study of oxido-reduction reactions using edible plants
The present work had as main goals the use of enzymatic reactions to degrade laboratory residues and to synthesize chiral alcohols. In the first part, it was carried out a screening of microorganisms and hydrolytic enzymes aiming the biorecycling of hexane from laboratory residues (a mixture of hexane-ethyl acetate). This misture is widely employed to purify
Publicado em: 2008
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4. Separação do racemato N-Boc-Rolipram pelo processo cromatografico de leito movel simulado utilizando fase estacionaria quiral tris-(3,5-dimetilfenilcarbamato de celulose) suportada em silica
Chiral stationary phases (CSPs) have shown efficiency in racemate purification. Rolipram, (mais ou menos)-4-(3-(cyclopentyloxy)-4-methoxyphenyl)- pyrrolidin-2-one, is an antidepressant with significant pharmacological properties. The main objective of this work was Rolipram purification in the Chiral Stationary Phase tris(3,5-dimethylphenylcarbamoyl) cellulo
Publicado em: 2005
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5. Simulated moving-bed adsorption for separation of racemic mixtures
The two enantiomers that constitute a racemate have different activities when employed as pharmaceuticals. Due to this fact, fully recognized today, the pharmaceutical industry has been forced to market pure enantiomers instead of the racemic mixture whenever a chiral compound is involved. The simulated moving bed (SMB) is a chromatographic process that, unl
Brazilian Journal of Chemical Engineering. Publicado em: 2004-01
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6. Screening for microorganisms producing D-malate from maleate.
More than 300 microorganisms were screened for their ability to convert maleate into D-malate as a result of the action of maleate hydratase. Accumulation of fumarate during incubation of permeabilized cells with maleate was shown to be indicative of one of the two enzymes known to transform maleate. The ratio in which fumarate and malate accumulated could b
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7. Production of (R)-3-Chloro-1,2-Propanediol from Prochiral 1,3-Dichloro-2-Propanol by Corynebacterium sp. Strain N-1074
The production of (R)-3-chloro-1,2-propanediol [(R)-MCP] from prochiral 1,3-dichloro-2-propanol (DCP) was examined with a bacterial strain identified as a Corynebacterium strain. The addition of glycerol as a carbon source or some chlorinated alcohols to a medium was effective for the induction of activity catalyzing the transformation of DCP into MCP. The o
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8. Substrate Specificities of Hybrid Naphthalene and 2,4-Dinitrotoluene Dioxygenase Enzyme Systems
Bacterial three-component dioxygenase systems consist of reductase and ferredoxin components which transfer electrons from NAD(P)H to a terminal oxygenase. In most cases, the oxygenase consists of two different subunits (α and β). To assess the contributions of the α and β subunits of the oxygenase to substrate specificity, hybrid dioxygenase enzymes wer
American Society for Microbiology.
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9. Epoxidation reactions catalyzed by rat liver cytochromes P-450 and P-448 occur at different faces of the 8,9-double bond of 8-methylbenz[a]anthracene.
8-Methylbenz[a]anthracene (8-MeBaA) transdihydrodiol metabolites were isolated by reversed-phase and normal-phase HPLCs from incubations of 8-MeBaA with liver microsomes or a reconstituted system containing purified cytochrome P-448 and epoxide hydrolase. Regardless of the enzyme source, the metabolically formed 8-MeBaA trans-3,4- and -5,6-dihydrodiols were
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10. Toluene Monooxygenase-Catalyzed Epoxidation of Alkenes
Several toluene monooxygenase-producing organisms were tested for their ability to oxidize linear alkenes and chloroalkenes three to eight carbons long. Each of the wild-type organisms degraded all of the alkenes that were tested. Epoxides were produced during the oxidation of butene, butadiene, and pentene but not hexene or octadiene. A strain of Escherichi
American Society for Microbiology.
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11. An efficient and general route to reduced polypropionates via Zr-catalyzed asymmetric C—C bond formation
An efficient and general method for the synthesis of reduced polypropionates has been developed through the application of asymmetric carboalumination of alkenes catalyzed by dichlorobis(1-neomenthylindenyl)zirconium [(NMI)2ZrCl2]. In this investigation, attention has been focused on those reduced polypropionates that are α-monoheterofunctional and either �
National Academy of Sciences.
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12. Degradation of Benzo[a]pyrene by Mycobacterium vanbaalenii PYR-1
Metabolism of the environmental pollutant benzo[a]pyrene in the bacterium Mycobacterium vanbaalenii PYR-1 was examined. This organism initially oxidized benzo[a]pyrene with dioxygenases and monooxygenases at C-4,5, C-9,10, and C-11,12. The metabolites were separated by reversed-phase high-performance liquid chromatography (HPLC) and characterized by UV-visib
American Society for Microbiology.