Ethanol Purification
Mostrando 25-36 de 136 artigos, teses e dissertações.
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25. Bioactivity guided isolation and characterization of the phytoconstituents from the Tridax procumbens
Tridax procumbens L., Asteraceae, has been extensively used in Ayurvedic system of medicine for various ailments. Previous studies on the extracts of T. procumbens revealed remarkable immunomodulatory activity of TPEIF (T. procumbens ethanol insoluble fraction) extract. The dried methanol extract of T. procumbens was dissolved in distilled water, and then fr
Revista Brasileira de Farmacognosia. Publicado em: 04/02/2011
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26. Seleção de leveduras para bioconversão de D-xilose em xilitol / Yeast selection for bioconversion of D-xylose to xilitol
Microbial species, particularly yeast, are of great importance for the production of xylitol. The xylitol production involves complicated metabolic regulation, including the transport of D-xylose, production of key enzymes and cofactor regeneration. Thus, screening of microorganisms that consume D-xylose naturally becomes a viable and effective way to obtain
Publicado em: 2010
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27. Isolation, Purification and Evaluation of Antibacterial Agents from Aloe vera
The ethanol, methanol and acetone extracts of Aloe vera gel were studied for their antimicrobial activity against four Gram-positive and Gram-negative bacteria using agar well diffusion method. The extracts showed varied levels of antimicrobial activity against the tested pathogens. The ethanol and methanol extracts showed higher activity while acetone extra
Brazilian Journal of Microbiology. Publicado em: 2009-12
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28. Ternary phase diagram of ketamine ((R,S)-2-(2-chlorophenyl)-2methylaminocyclohexanone) in ethanol and preliminary studies aiming at Enantioselective Crystallization of S-ketamine
Crystallization is an important industrial-scale process for the purification of enantiomers that depends on a phase diagram. In this work, the ternary phase diagram of R- and S-ketamine in ethanol was determined. The eutectic point indicated that crystallization of pure enantiomers from solutions containing more than 75% of the desired enantiomer is feasibl
Brazilian Journal of Chemical Engineering. Publicado em: 2009-06
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29. Purification and characterization of an extreme halothermophilic protease from a halophilic bacterium Chromohalobacter sp. TVSP101
An extreme halophilic bacterium was isolated from solar saltern samples and identified based on biochemical tests and 16S r RNA sequencing as Chromohalobacter sp. strain TVSP101. The halophilic protease was purified using ultrafiltration, ethanol precipitation, hydrophobic interaction column chromatography and gel permeation chromatography to 180 fold with 2
Brazilian Journal of Microbiology. Publicado em: 2009-03
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30. Análise termo-oxidativa do biodiesel de girassol (helianthus annuus) / Thermo-oxidative Analysis of Sunflower (Hellianthus annus) Biodiesel
The present work aims at investing the biodiesel obtained from the transesterification of sunflower oil by means of alkaline catalysis using 30% of ethyl alcohol, 1% KOH for each 100g of oil and (1:6) oil/alcohol molar ratio. The overall content of ethyl esters (99.72%) was determined by gas chromatography coupled to mass spectrometer, confirm the efficiency
Publicado em: 2009
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31. Produção de biodiesel via transesterificação do óleo de nabo forrageiro
The obtainment of solid, liquid and gaseous fuels from biomass is among the well-known possibilities of the use of the energetic resources. Brazil is considered a privileged country to develop from biomass point of view, due to its vast farmland, abundance of water and high incidence of solar radiation on the land, and the availability of rural workforce. Pr
Publicado em: 2009
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32. Pharmacognostic study, investigation of antimicrobial activities, leishmanicidal and toxicity of Rhamnidium elaeocarpum Reissek - Rhamnaceae (little coffee) / Estudo Farmacognóstico, Investigação das Atividades Antimicrobiana, Leishmanicida e Toxicidade Aguda de Rhamnidium elaeocarpum Reissek RHAMNACEAE (Cafezinho)
In the last years the treatment with medicines made from medicinal plants has increased. A concern about the useful of these natural products is the quality control pharmacobotanical, phytochemical and purity tests, which make up the technical specifications of a particular plant species. Moreover, pharmacological and toxicological studies must be conducted
Publicado em: 2009
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33. A convenient method for lecithin purification from fresh eggs
The increasing demand for fatty acid-free lecithin required modifications in existing purification methods. In this technical note we describe a purification procedure with the following steps: a) homogenization and extraction of yolks obtained from fresh eggs with acetone, b) solubilization with ethanol and solvent elimination and c) repeated solubilization
Química Nova. Publicado em: 2008
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34. Production of a long chain fatty alcohol concentrate from saponified and acidulated sugarcane wax / Obtenção de concentrado de alcoois graxos de cadeia longa a partir de cera de cana de açucar saponificada e acidulada
Brazil, being the world?s greatest sugarcane producer and sugar exporter, represents a potential center for the production of sugarcane wax. This wax is obtained from the filter cakes, a sub-product of the sugar and alcohol industry. From the wax, it is possible to obtain concentrates of long chain fatty alcohols and fatty acids, compounds used in several ap
Publicado em: 2008
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35. Phytochemical study of the species Serjania lethalis St. Hil. / Estudo fitoquímico da espécie Serjania lethalis St. Hil.
The brazilian is biodiversity considered one of higher of the world, is a bit know and explored as the source of drugs medicines. In search of new bioactive molecules the etanolic extract of stem of Serjania lethalis St. Hil was studied in for the molluscicide, miracicide and shistossomicida activity. The specie S. lethalis was collected in Brasilia and a vo
Publicado em: 2008
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36. Studies of residual oils originating from of processo f fry and qualification of those for obtaining of monoésteres (Biodiesel). / Estudos de óleos residuais oriundos de processo de fritura e qualificação desses para obtenção de monoésteres (Biodiesel).
Biodiesel is now considered as an important option for full or partial diesel fossil replacement. At the same time, biodiesel is a renewable and an environmentally friendly fuel. This work has as goal to employ residual vegetable oils for biodiesel production and evaluate its viability as raw material. For that, some initial steps were considered in order to
Publicado em: 2008