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Lopes B.L.F.,University of Campinas | Sanchez-Camargo A.P.,University of Campinas | Sanchez-Camargo A.P.,Institute of Food Science and Technology INTAL | Ferreira A.L.K.,University of Campinas | And 3 more authors.
Journal of Supercritical Fluids | Year: 2012

A sample of fish oil containing 4.6% and 6.7% of the fatty acids EPA and DHA, respectively, was extracted from freeze-dried slices of a speckled fish (Pseudoplatystoma corruscans). Solubility of the oil was measured in supercritical carbon dioxide (scCO 2) at the temperature of 40°C and pressures of 100, 200, 300 and 400 bar, and at temperatures of 50 and 60°C and pressures of 200, 300 and 400 bar. The fatty acid compositions of some extracts were determined at the temperatures of 33, 40, 50 and 60°C and within the same range of pressures. Values for solubility could be correlated by the Chrastil equation, which after fitting, was able to interpolate and extrapolate values for solubility which agreed in order of magnitude with experimental values reported in literature. The scCO 2 was selective in fractionating the triacylglycerols containing the fatty acids EPA and DHA under the conditions of 100 and 200 bar, thus proving the technical viability of fractionating fish oils with lower contents of these fatty acids in the triacylglycerol molecules. © 2011 Elsevier B.V. All rights reserved.


Sanchez-Camargo A.P.,University of Campinas | Sanchez-Camargo A.P.,Institute of Food Science and Technology INTAL | Meireles M.A.A.,University of Campinas | Ferreira A.L.K.,University of Campinas | And 2 more authors.
Journal of Supercritical Fluids | Year: 2012

In this study, the effect of ethanol addition to supercritical carbon dioxide (scCO 2) on the extraction of astaxanthin and ω-3 fatty acid (EPA + DHA, mainly) from redspotted shrimp waste (Farfantepenaeus paulensis) was investigated. The co-solvent was used in the ratios of 5, 10 and 15% wt. and the conditions of temperature and pressure (300 bar and 50°C) were adopted according to results achieved of the highest total extraction yield of lipids and astaxanthin in preliminary tests without the use of co-solvent. Results showed that the addition of ethanol conferred a significant improvement on the extraction yields of lipids and astaxanthin, and also increased the proportion of ω-3 fatty acids in the lipids of the extracts. An increase of 136% was reaching in the total lipid extraction yield when the proportion of ethanol was increased from 5% to 15% wt. Maximum recoveries of 93.8% and 65.2% for lipids and astaxanthin, respectively, with regard to the initial content in the waste occurred when the condition using the maximum proportion (15% wt.) of ethanol in the scCO 2/ethanol mixture was used. The best results for the recovery of EPA and DHA were also obtained under this condition, showing that supercritical extraction employing entrainers could be a competitive technology as compared to organic solvent extraction. © 2011 Elsevier B.V. All rights reserved.


Martinez-Correa H.A.,National University of Colombia | Cabral F.A.,University of Campinas | Magalhaes P.M.,University of Campinas | Queiroga C.L.,University of Campinas | And 3 more authors.
Journal of Supercritical Fluids | Year: 2012

One and two step extraction processes were used to obtain extracts from two samples of alecrim do campo leaves (Baccharis dracunculifolia L.). In the one step process, supercritical carbon dioxide (scCO 2), ethanol and water were used as solvents. In the two step process, scCO 2 was used as a solvent in the first step followed by ethanol or water as the solvent in a second step on the residue resulting from scCO 2 extraction. Extraction yields, total polyphenol, total flavonoid and Artepillin C contents, antioxidant activity by DPPH radical scavenging and β-carotene bleaching methods were measured in all extracts. The supercritical extract showed a higher concentration and yield of Artepillin C, low antioxidant activity by the DPPH method and high antioxidant activity by the β-carotene method. In general the aqueous and ethanol extracts were more concentrated in polyphenol compounds and a second extraction step produced high yields with high concentrations of phenolic compounds. © 2011 Elsevier B.V. All rights reserved.

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