Ciência e Tecnologia de Alimentos (Impact Factor: 0.41). 12/1997; 17(4). DOI: 10.1590/S0101-20611997000400012
Source: DOAJ


Nos últimos anos, vem crescendo o interesse em alimentos com baixo índice de calorias. Nos métodos tradicionais de extração de lipídeos com solventes orgânicos, devido as condições de extração, a integridade dos compostos extraídos e da matriz pode ser afetada pela decomposição térmica ou por contaminação pelo solvente. A extração com fluido supercrítico (EFSC) pode proporcionar um método alternativo para remover lipídeos, sem que haja redução significativa nas propriedades organolépticas do produto. O objetivo deste trabalho é extrair parcialmente o óleo contido na amêndoa da castanha de caju (Anacardium occidentale) com dióxido de carbono (CO2) supercrítico em condições de pressão de 100-170 bar e temperatura de 40-80 (C, para obter um produto de valor calórico reduzido que poderá ser usado como substituto para o amendoim e outras amêndoas na indústria de confeitos. Os experimentos foram realizados em um extrator de 300 ml, dispondo de sistemas de agitação magnética e variação de temperatura. Os resultados experimentais mostraram que o aumento da pressão acarretou um aumento na eficiência de extração. O efeito da temperatura foi o mesmo porém menos significativo.

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    • "We have performed continuous extraction using a Soxhlet extractor (Foss Tecator Soxtec HT 6; Fisher Scientific, Pittsburgh, PA, USA) and a heater (Tecnal, Piracicaba, Brazil) that had been preheated in an incubator for 60 min at 150°C. The solvent used was hexane [21-23]. "
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    ABSTRACT: Background The babassu palm tree is native to Brazil and is most densely distributed in the Cocais region of the state of Maranhão, in northeastern Brazil. In addition to the industrial use of refined babassu oil, the milk, the unrefined oil and the nuts in natura are used by families from several communities of African descendants as one of the principal sources of food energy. The objective of this study was to evaluate the effects of babassu oil on microvascular permeability and leukocyte-endothelial interactions induced by ischemia/reperfusion using the hamster cheek pouch microcirculation as experimental model. Methods Twice a day for 14 days, male hamsters received unrefined babassu oil (0.02 ml/dose [BO-2 group], 0.06 ml/dose [BO-6 group], 0.18 ml/dose [BO-18 group]) or mineral oil (0.18 ml/dose [MO group]). Observations were made in the cheek pouch and macromolecular permeability increase induced by ischemia/reperfusion (I/R) or topical application of histamine, as well as leukocyte-endothelial interaction after I/R were evaluated. Results The mean value of I/R-induced microvascular leakage, determined during reperfusion, was significantly lower in the BO-6 and BO-18 groups than in the MO one (P < 0.001). In addition, histamine-induced increase of microvascular permeability was significantly less pronounced in BO groups compared to MO one. No significant differences among groups in terms of leukocyte adhesion, concentrations of tumor necrosis factor alpha, interleukin 1, and interleukin 6 were found. Conclusions Our findings suggest that unrefined babassu oil reduced microvascular leakage and protected against histamine-induced effects in postcapillary venules and highlights that these almost unexploited nut and its oil might be secure sources of food energy.
    Full-text · Article · Nov 2012 · Lipids in Health and Disease
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    ABSTRACT: In this work, a review of the Brazilian scientific production in the past 10 years in the field of supercritical fluid is presented. The historical facts associated with the previous edition of the Brazilian Meeting on Supercritical Fluids are discussed. Because of the importance of the other South America countries contribution to the filed, a summary of the research published in the past 5 years by all South America countries is also presented.In the past 5 years (1999–2003) 82 papers from South American countries were published in journals indexed in the Web of Science data base. Of these, 26 papers were related to the use of supercritical fluids as an analytical tool. Supercritical extraction from a variety of vegetable raw material contributed with 38 papers and the petroleum industry added 2 papers to the field. Reactions contributed with 3 publications while thermodynamics and fundamental studies were responsible for 13 publications. The Brazilian contribution represented 53–84% of the publications in the above areas.
    No preview · Article · Jun 2005 · Journal of Supercritical Fluids The
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    ABSTRACT: Whey buttermilk, a by-product from whey cream processing to butter, is rich in milk fat globule membrane (MFGM) constituents, which have technological and potential health properties. The objective of this work was to produce a dairy ingredient enriched in MFGM material, especially phospholipids, from whey buttermilk. Whey buttermilk was concentrated by ultrafiltration (10×) and subsequently diafiltered (5×) (10 kDa molecular mass cutoff membrane) at 25 °C and the final retentate was spray-dried. The whey buttermilk powder was submitted to supercritical extraction (350 bar, 50 °C) using carbon dioxide. The membrane filtration removed most of the lactose and ash from the whey buttermilk, and the supercritical extraction extracted exclusively non-polar lipids. The final powder contained 73% protein and 21% lipids, of which 61% were phospholipids. This ingredient, a phospholipids-rich dairy powder, could be used as an emulsifier in different food systems.
    Full-text · Article · Sep 2010 · International Dairy Journal


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