Supercritical Fluid Extraction
Mostrando 13-24 de 69 artigos, teses e dissertações.
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13. Floculação de Chlorella sp. produzida em concentrado de dessalinização e estudo de método de extração de lipídeos intracelulares
Chlorella sp. was used to assess algal lipid production with concentrated desalination. In order to investigate the action of the flocculating agent calcium chloride and pH, a Box-Behnken Design and a Central Composite Design (CCD) were carried out. Also, Soxhlet and Supercritical Fluid Extraction (SFE), with and without sonication lipid extraction methods,
Quím. Nova. Publicado em: 2014
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14. Supercritical CO2 extraction of Schinus molle L with co-solvents: mathematical modeling and antimicrobial applications
This work investigates the antimicrobial activity of the Schinus molle L. leaves extracts obtained under supercritical conditions using carbon dioxide and co-solvents. Antimicrobial qualitative evaluation was carried out through the bioautography technique and the microorganisms studied were Staphylococcus aureus, Pseudomonas aeruginosas, Escherichia coli, M
Braz. arch. biol. technol.. Publicado em: 2013-06
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15. Mathematical modeling of supercritical fluid extraction of oil from canola and sesame seeds
Mathematical modeling of supercritical fluid extraction of oil from canola and sesame seeds with a two-phase model was performed in this work. A model based on differential mass balance was used to correlate the experimental data. Different adsorption isotherm models (Henry, Freundlich and Brunauer, Emmet and Teller (BET)) were used to describe the equilibri
Braz. J. Chem. Eng.. Publicado em: 2013-03
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16. Safety study of an experimental apparatus for extraction with supercritical CO2
During the process of supercritical CO2 extraction it is necessary to use high pressures in the procedure. The explosion of a pressure vessel can be harmful to people and cause serious damage to the environment. The aim of this study is to investigate the probability of death and injury in a laboratory unit for supercritical fluid extraction in the case of a
Braz. J. Chem. Eng.. Publicado em: 2012-09
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17. Extraction, fatty acid profile and antioxidant activity of sesame extract (Sesamum Indicum L.)
This article carried out the extraction of sesame oil by using three extraction techniques: supercritical fluid extraction (SFE), Soxhlet and sequential extraction. The SFE was performed using supercritical carbon dioxide (SC-CO2) as solvent and ethanol as cosolvent. Tests were performed at 20 MPa, 35ºC and a flow rate of 2.5 g CO2/min with a total extracti
Brazilian Journal of Chemical Engineering. Publicado em: 2012-06
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18. Extraction and isolation of dictamnine, obacunone and fraxinellone from Dictamnus dasycarpus Turcz. by supercritical fluid extraction and high-speed counter-current chromatography
Supercritical fluid extraction was used to extract active compounds from the Chinese traditional medicinal D. dasycarpus under the pressure of 30 MPa and temperature of 45 ºC. Further separation and purification was established by high-speed counter-current chromatography (HSCCC) with a two-phase solvent system composed of n-hexane-ethyl acetate-methanol-wa
Química Nova. Publicado em: 2012
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19. Influência do pré-tratamento de tubérculos e rizomas de priprioca (Cyperus articulatus L.) na obtenção de óleo essencial por extração com CO2 supercrítico / Influence of the priprioca (Cyperus articulatus L.) pre-treatment on the essential oil obtainment with supercritical CO2
Óleo essencial é uma mistura de componentes voláteis produzido por vegetais e tem as funções de proteção contra predadores e de atrair agentes polinizadores. É utilizado pelas indústrias de alimentos, de cosméticos e também pela farmacêutica. O rendimento e a composição do óleo essencial variam de acordo com inúmeros fatores, dentre eles as c
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/06/2011
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20. Purification of Single-Wall carbon nanotubes by heat treatment and supercritical extraction
Arc discharge is the most practical method for the synthesis of single wall carbon nanotubes (SWCNT). However, the production of SWCNT by this technique has low selectivity and yield, requiring further purification steps. This work is a study of purification of SWCNT by heat treatment in an inert atmosphere followed by supercritical fluid extraction. The raw
Materials Research. Publicado em: 12/08/2011
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21. Supercritical fluid extraction of volatile and non-volatile compounds from Schinus molle L.
Schinus molle L., also known as pepper tree, has been reported to have antimicrobial, antifungal, anti-inflammatory, antispasmodic, antipyretic, antitumoural and cicatrizing properties. This work studies supercritical fluid extraction (SFE) to obtain volatile and non-volatile compounds from the aerial parts of Schinus molle L. and the influence of the proces
Brazilian Journal of Chemical Engineering. Publicado em: 2011-06
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22. Extraction with supercritical fluid and comparison of chemical composition from adults and young leaves of Zanthoxylum tingoassuiba
Plants differ in metabolism during their life cycle. In species used as phytotherapics, these changes determine the quality and effectiveness of the product. The aim of this study to evaluate the differences of chemical extracts obtained with supercritical CO2 from young and adult leaves of Zanthoxylum tingoassuiba St.-Hil., Rutaceae, a species used in the f
Revista Brasileira de Farmacognosia. Publicado em: 25/03/2011
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23. Extração, micronização e estabilização de pigmentos funcionais : construção de uma unidade multipropósito para desenvolvimento de processos com fluídos pressurizados / Extractionm micronization and stabilization of functional pigments : construction of multipurpose unit for pressurized fluid process development
The food industry is continuously searching compounds that present physical and chemical properties to improve their products. Most of them are additives with antioxidant properties, colorants or additives with positive effects to human health. Natural additives are always preferred to synthetic compounds. Flavonoids and carotenoids are two of the major func
Publicado em: 2011
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24. Montagem e validação de unidade piloto para processo de desasfaltação em diferentes condições de operação / Assembly and experimental validadtion of deasphalting pilot plant at different operating conditions
A crescente demanda por óleos leves nas últimas décadas está forçando a indústria de petróleo a desenvolver processos novos e mais eficientes, além de adaptar e otimizar os existentes no processamento dos óleos crus pesados, extra-pesados e seus resíduos. A extração com diferentes solventes na região do supercrítico apresenta-se como alternativ
Publicado em: 2011