Methyl Ketone
Mostrando 13-24 de 83 artigos, teses e dissertações.
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13. Serine protease activities in Oxysarcodexia thornax (Walker) (Diptera: Sarcophagidae) first instar larva
We report for the first time the expression of multiple protease activities in the first instar larva (L1) of the flesh fly Oxysarcodexia thornax (Walker). Zymographic analysis of homogenates from freshly obtained L1 revealed a complex proteolytic profile ranging from 21.5 to 136 kDa. Although some activities were detected at pH 3.5 and 5.5, the optimum pH f
Memórias do Instituto Oswaldo Cruz. Publicado em: 2008-08
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14. Determinação de metil-etil-cetona em amostras de urina com amostragem por micro extração em fase sólida (MEFS) em headspace associada à cromatografia gasosa com detector de ionização de chama (CG-DIC)
Methyl ethyl ketone (MEK) is a solvent commonly used in chemical, paint and shoe industry. The aim of this study was to develop and validate a method for urinary quantification of MEK, employing headspace solid phase micro extraction sampling (SPME) coupled to gas chromatography with flame ionization detection (GC-FID). The calibration curve (y=4.6851x-0.001
Química Nova. Publicado em: 2008
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15. Recuperação de metais de catalisadores de hidrorrefino usados via fusão com KHSO4
This work describes a process for metal recovery from spent NiMo and CoMo/Al2O3 commercial hydrorefining catalysts. The samples were treated by fusion with potassium hydrogen sulfate (5 h, 600 ºC) with a KHSO4/catalyst mass ratio of 10:1. After fusion the solid was solubilized in water (100 ºC), leaving silicon compounds as residue. Losses of nickel and co
Química Nova. Publicado em: 2006-07
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16. Proposta de tratamento e disposição adequada de resíduos químicos gerados no Laboratório de Separação e Pré-concentração (LSPc) do IQ-UFU
In this work it was studied possible solutions for the problems decurrents of the undue evasion of residues in the environment on the Laboratório on Separação and Préconcentração (LSPc) of the Chemistry Institut in the Universidade Federal de Uberlândia. From considerations above, some procedures realized by several Federal Instituts that helped to mi
Publicado em: 2006
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17. Gas-phase selective conjugate addition of methanol to acetone for methyl vinyl ketone over SnO2 nanoparticle catalysts
Neste trabalho é apresentada a reação de condensação aldólica entre metanol e acetona promovida por nanopartículas de dióxido de estanho, não dopadas e dopadas com as terras raras Ce e Y. Diversas condições de relação molar metanol/acetona foram avaliadas, objetivando a obtenção com elevada seletividade do composto a, b-insaturado, metil vinil
Journal of the Brazilian Chemical Society. Publicado em: 2005-06
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18. Estudos visando a elucidação estrutural do alcaloide parviestemoamida : sintese (+/-)-10-epi- parviestemoamida
(-)-Parvistemoamide, a member of the Stemona alkaloids was reported by Xu and coworkers in 1991 as a minor alkaloid fram the roots of Stemona parviflora. Extracts of the Stemonaceae species have been used in Chinese and Japanese folk medicine as insecticides, antihelmintics for domestic animaIs and drugs for the treatment of human respiratory diseases such a
Publicado em: 2005
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19. Separação e purificação do ácido clavulânico através de extração líquido-líquido seguida de adsorção em coluna de leito fixo.
A study was made of the extraction of clavulanic acid (CA) from a fermented medium and its concentration and purification, based on a comparison of two liquid-liquid extraction methods, followed by adsorption in a fixed bed column containing resins (hydrophobic polymeric resin and ion exchange resin). The extraction and adsorption steps proposed here were ev
Publicado em: 2005
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20. Rare earth-doped nanostructured tin dioxide for catalytic and gas sensor applications. / Dióxido de estanho nanoestruturado dopado com terras raras como catalisador e sensor de gases.
This work presents and discusses results of the effects of doping on rare earth-doped nanosize SnO2, obtained using the polymeric precursor method and prepared at different annealing temperatures. Only the cassiterite phase was observed for the rare earth-doped SnO2. Structural and morphological studies in pure and rare earthdoped tin dioxide were performed
Publicado em: 2004
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21. Estudo quimioenzimatico da sintese de um analogo do residuo N-terminal de nikkomicinas
Nikkomycins belong to a group of nucleoside peptides antibiotics produced by streptomycets. These compounds are potent chitin synthetase inhibitors and they exhibit fungicidal, insecticidal, and acaricidal activities. Our approach began with an asymmetric reduction of ethyl benzoylacetate 37. We evaluate the biocatalytic potential of some brazilian microorga
Publicado em: 2003
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22. Sintese formal do adoçante natural (-)-monatina
In this work we describe the asymmetric formal synthesis of (-)-monatin [(3-indolyl)-2-amino-4-carboxy-4-hydroxypentanoic acid), a powerful natural sweetener, isolated from roots of the african plant Schlerochiton ilicifolius. Monatin exhibit a sweet taste 1400 times more powerful than that of sucrose. (-)-Monatin bears two stereogenic centers, namely, 2S an
Publicado em: 2003
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23. Isolamento e seleção de microrganismos brasileiros para reações de biocatalise e produção de metabolitos
This thesis is a pioneer work at the Chemistry Institute/UNICAMP, consisting of a preliminary investigation of a Brazilian Culture Collection biocatalitic potential (Coleção de Culturas Tropical ,CCT, Fundação Tropical de Pesquisas "André Tosello") 13 different microorganisms from the above mentioned collection were evaluated: fungi (Aspergillus niger C
Publicado em: 2002
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24. Sintese quimioenzimatica de (-)- serricornina e (+)- sitofilure
Chiral alcohols are versatile and convenient building blocks in the synthesis of biologically important compounds. Asymmetric reduction of b-keto esters by Baker s yeast (S. cerevisiae) has been widely used to obtain chiral alcohols because of simplicity, cheapness and enantioselectivity. However, the optical purities and the yields of these compounds are of
Publicado em: 1997