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	Provedor de dados Ciênc. Tecnol. Aliment. (7) Autor MEIRELES,M. Angela A. (7) CARDOZO-FILHO,Lúcio (3) WOLFF,Fred (2) CHASSAGNEZ,A. Luis M. (1) CORRÊA,Nádia C. F. (1) FERRUA,Fabiana Queiroz (1) FRANÇA,Luiz F. (1) MARQUES,Marcia O. M (1) MONTEIRO,Alcilene R (1) NOBREGA,Lia P. (1) STRAGEVITCH,Luiz (1) ZAPATA NOREÑA,Caciano (1) Mais... Palavra-chave Supercritical extraction (5) Essential oil (2) Peng-Robinson (2) Phase equilibria (2) Soave-Redlich-Kwong (2) CO2 supercrítico (1) Carotene (1) Clove essential oil (1) Curcumina (1) Cúrcuma (1) Desterpenação (1) Diffusion coefficient (1) Extraction kinetics (1) Extração (1) Finite difference (1) Fluido Supercrítico (1) Ginger (1) Mass transfer (1) Modelo de difusão em sólido (1) Oleoresin (1) Mais... Tipo do documento Info:eu-repo/semantics/article (7) Ano 1997 (7) País Brazil (7) Idioma Inglês (5) Português (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 7 Primeira ... 1 ... Última THE GENERALIZED MAXIMUM LIKELIHOOD METHOD APPLIED TO HIGH PRESSURE PHASE EQUILIBRIUM Ciênc. Tecnol. Aliment. CARDOZO-FILHO,Lúcio; STRAGEVITCH,Luiz; WOLFF,Fred; MEIRELES,M. Angela A.. The generalized maximum likelihood method was used to determine binary interaction parameters between carbon dioxide and components of orange essential oil. Vapor-liquid equilibrium was modeled with Peng-Robinson and Soave-Redlich-Kwong equations, using a methodology proposed in 1979 by Asselineau, Bogdanic and Vidal. Experimental vapor-liquid equilibrium data on binary mixtures formed with carbon dioxide and compounds usually found in orange essential oil were used to test the model. These systems were chosen to demonstrate that the maximum likelihood method produces binary interaction parameters for cubic equations of state capable of satisfactorily describing phase equilibrium, even for a binary such as ethanol/CO2. Results corroborate that the... Tipo: Info:eu-repo/semantics/article Palavras-chave: Phase equilibria; Supercritical extraction; Peng-Robinson; Soave-Redlich-Kwong. Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20611997000400026 HIGH PRESSURE PHASE EQUILIBRIUM: PREDICTION OF ESSENTIAL OIL SOLUBILITY Ciênc. Tecnol. Aliment. CARDOZO-FILHO,Lúcio; WOLFF,Fred; MEIRELES,M. Angela A.. This work describes a method to predict the solubility of essential oils in supercritical carbon dioxide. The method is based on the formulation proposed in 1979 by Asselineau, Bogdanic and Vidal. The Peng-Robinson and Soave-Redlich-Kwong cubic equations of state were used with the van der Waals mixing rules with two interaction parameters. Method validation was accomplished calculating orange essential oil solubility in pressurized carbon dioxide. The solubility of orange essential oil in carbon dioxide calculated at 308.15 K for pressures of 50 to 70 bar varied from 1.7<FONT FACE="Symbol">±</font> 0.1 to 3.6<FONT FACE="Symbol">±</font> 0.1 mg/g. For same the range of conditions, experimental solubility varied from 1.7<FONT... Tipo: Info:eu-repo/semantics/article Palavras-chave: Essential oil; Phase equilibria; Supercritical extraction; Peng-Robinson; Soave-Redlich-Kwong. Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20611997000400027 THE EFFECTIVE DIFFUSIVITY OF CLOVE(Eugenia caryophyllus) ESSENTIAL OIL IN PRESSURIZED CO2 Ciênc. Tecnol. Aliment. ZAPATA NOREÑA,Caciano; MEIRELES,M. Angela A.. The effective diffusivity of clove essential oil in subcritical liquid CO2 was estimated. The experimental apparatus employed was a fixed-bed extractor. The fixed bed was formed with grounded (mesh -32 + 65) and compacted clove buds which were considered a solid element. The effective diffusion coefficient was evaluated by fitting the experimental concentration profile to the unsteady state mass balance equation for unidirectional diffusion in a finite solid medium. The diffusion coefficient was related to the concentration of oil in the solid by an exponential function. The estimated values of the effective diffusion coefficient varied from 3.64 to 5.22x10-10 m2/s. The average relative errors were lower than 3.1%. Tipo: Info:eu-repo/semantics/article Palavras-chave: Diffusion coefficient; Mass transfer; Finite difference; Clove essential oil; Supercritical extraction. Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20611997000400010 ESTUDO DO PROCESSO DA EXTRAÇÃOSUPERCRÍTICA DE ÓLEOS ESSENCIAIS DE PRODUTOS NATURAIS Ciênc. Tecnol. Aliment. CARDOZO-FILHO,Lúcio; FERRUA,Fabiana Queiroz; MEIRELES,M. Angela A.. A desterpenação do óleo essencial de laranja é uma preocupação da indústria cítrica. Esta consiste em concentrar os componentes oxigenados do óleo, que são os maiores responsáveis pelo sabor e aroma deste, reduzindo a fração terpênica que se degrada facilmente promovendo a formação de compostos com sabores e aroma indesejáveis. Esta fração oleosa rica em compostos oxigenados pode ser empregada em bebidas e outros alimentos como aromatizante mais agradável. Um dos métodos em estudo para a concentração dos compostos oxigenados do óleo essencial de laranja é a adsorção na sílica gel, seguida da dessorção fracionada com dióxido de carbono pressurizado. Este processo permite a obtenção de frações oleosas mais concentradas em compostos oxigenados que outros... Tipo: Info:eu-repo/semantics/article Palavras-chave: Desterpenação; Óleo essencial de laranja; CO2 supercrítico; Modelo de difusão em sólido. Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20611997000400021 COMPARISON OF GINGER (Zingiber officiale Roscoe) OLEORESIN OBTAINED WITH ETHANOL AND ISOPROPANOL WITH THAT OBTAINED WITH PRESSURIZED CO2 Ciênc. Tecnol. Aliment. NOBREGA,Lia P.; MONTEIRO,Alcilene R; MEIRELES,M. Angela A.; MARQUES,Marcia O. M. Ginger (Zingiber officinale Roscoe) belongs to the Zingiberacea family. It is a spice of great commercial importance. In this work ginger oleoresin was obtained with ethanol, isopropanol and liquid carbon dioxide. The chemical compositions of the extract were compared with each other. All oleoresin samples had monoterpenes and sesquiterpenes. Carboxylic acids were found in organic solvent extracts for an extraction time of 2 hours. The component responsible the for pungent characteristic of the oleoresin, gingerois, were detected in samples obtained with organic solvent for extraction times of 6 hours and in samples obtained with CO2 liquid for extraction times of 2 hours. Tipo: Info:eu-repo/semantics/article Palavras-chave: Essential oil; Oleoresin; Ginger; Solvent extraction; Supercritical extraction. Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20611997000400013 EXTRAÇÃO DE OLEORESINA DE CÚRCUMA (Curcuma longa L) COM CO2 SUPERCRÍTICO Ciênc. Tecnol. Aliment. CHASSAGNEZ,A. Luis M.; CORRÊA,Nádia C. F.; MEIRELES,M. Angela A.. Dentre as fontes de corantes naturais mais utilizadas na indústria de alimentos, encontra-se a cúrcuma (Curcuma longa L), um rizoma do qual podem ser obtidas substâncias como a curcumina, demetoxicurcumina e bis-demetoxicurcumina. Estes pigmentos possuem coloração amarela e capacidade de substituir corantes artificiais. Com a finalidade de verificar a influência do pré-tratamento de secagem na extração, foram realizados experimentos de extração de oleoresina de cúrcuma com CO2 supercrítico, na unidade de extração do Laboratório de Engenharia Química da Universidade Federal do Pará, submetendo-se a matéria-prima a uma secagem nas temperaturas de 70 e 105oC. As extrações foram feitas a pressões de 200, 250 e 300 bar, e na temperatura de 45oC. Os resultados... Tipo: Info:eu-repo/semantics/article Palavras-chave: Fluido Supercrítico; Extração; Cúrcuma; Secagem; Oleoresina; Curcumina. Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20611997000400011 EXTRACTION OF OIL FROM PRESSED PALM OIL (Elaes guineensis) FIBERS USING SUPERCRITICAL CO2 Ciênc. Tecnol. Aliment. FRANÇA,Luiz F.; MEIRELES,M. Angela A.. Residual fibers from palm oil production are a good source of carotene, since they contain more than 5% of the original oil, with about 5000 ppm of carotenoids. As carotenoids are thermosensitive molecules, supercritical CO2 can be used for oil recovery, because this technique employs low temperatures. In this work results of oil extraction experiments from pressed palm oil fibers are shown. Fibers were from AGROPALMA, an industry which is located in Tailândia (Pará, Brazil). Extractions were carried out at 200, 250 and 300 bar and at temperatures of 45 and 55oC. Oil was analyzed by UV/vis spectrophotometry for total carotene determination. Results showed a large increase in extraction rate from 200 to 250 bar and a small variation from 250 to 300 bar. The... Tipo: Info:eu-repo/semantics/article Palavras-chave: Supercritical extraction; Vegetable oil; Palm oil; Extraction kinetics; Carotene. Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20611997000400008 Registros recuperados: 7 Primeira ... 1 ... Última

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