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SUPERCRITICAL CO2 EXTRACTION OF CURCUMINS ( supercritical-co2-extraction-curcumins )

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SUPERCRITICAL CO2 EXTRACTION OF CURCUMINS AND ESSENTIAL OIL FROM THE RHIZOMES OF TUMERIC (Curcuma Longa L) Angel Luis Chassagnez Méndez1, Nélio Teixeira Machado1, Marilena Emmi Araujo1, J. G. Maia2, Maria Angela de Almeida Meireles3 1Laboratory of Separation Processes (LAOS), Department of Chemical Engineering, UFPa AV. Perimetral No 1, CEP 66050-970, Belém-Pará-Brazil Phone. 55-91-2111293 Fax. 55- 91-211.1291 E-mail: emmi@amazom.com.br 2Department of Chemistry, UFPa AV. Perimetral No 1, CEP 66050-010, Belém-Pará-Brazil Phone. 55-91-211665 Fax. 55- 91-211.1635 2Laboratory of Physical Separations (LASEFI), Department of Food Engineering, FEA, UNICAMP Cx. P. 6121, 13083-970 Campinas-São Paulo-Brazil Phone. 55-91-2111293 Fax. 55- 91-211.1291 E-mail: meireles@ceres.fea.unicamp.br ABSTRACT The rhizomes of tumeric (Curcuma Longa L) are one of the most important natural sources of yellow color. The chemical compounds responsible for this property are the so-called curcuminoids. The curcuminoids are constituted by three different pigments (curcumin, desmethoxycurcumin, and bis-desmethoxycurcumin). These pigments are largely used in the food industry as substitutes of synthetic dyes like tartrazin. The rhizomes of tumeric were submitted to extraction with supercritical CO2 and supercritical CO2 using ethanol as co-solvent in order to obtain an extract with a high content of curcuminoids8. Extraction experiments have been carried out in a supercritical extraction pilot plant at pressures between 25 and 30 MPa and temperatures of 313 and 318 K. The influence of raw material previous-treatment (drying) and the addition of ethanol as co-solvent on the supercritical extraction process have been evaluated by analyzing the mass transfer kinetics and the content of curcuminoids in the extracts during the course of extraction. A mathematical model has been applied to describe the mass transfer kinetics. The mass transfer inside the solid matrix was described by a liner first order desorption model, while that in the gas phase was described by a convective mass transfer model. Experimental results showed that the concentration profile of curcuminoids during the



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