Please use this identifier to cite or link to this item: http://repositorio.ufpa.br/jspui/handle/2011/3592
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Type: Artigo de Periódico
Issue Date: Sep-2000
Authors: CHASSAGNEZ MÉNDEZ, Angel Luis
CORRÊA, Nádia Cristina Fernandes
FRANÇA, Luiz Ferreira de
MACHADO, Nélio Teixeira de
ARAÚJO, Marilena Emmi
Title: A mass transfer model applied to the supercritical extraction with CO2 of curcumins from turmeric rhizomes (Curcuma longa L)
Citation: CHASSAGNEZ MÉNDEZ, A. L., et al. A mass transfer model applied to the supercritical extraction with CO2 of curcumins from turmeric rhizomes (Curcuma longa L). Brazilian Journal of Chemical Engineering. São Paulo, v. 17, n. 3, p. 315-322, set. 2000. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322000000300007&lng=en&nrm=iso>. Acesso em: 20 mar. 2013.<http://dx.doi.org/10.1590/S010466322000000300007>.
Abstract: Increasing restrictions on the use of artificial pigments in the food industry, imposed by the international market, have increased the importance of raw materials containing natural pigments. Of those natural substances with potential applications turmeric rhizomes (Curcuma longa L), are one of the most important natural sources of yellow coloring. Three different pigments (curcumin, desmetoxycurcumin, and bis-desmetoxycurcumin) constitute the curcuminoids. These pigments are largely used in the food industry as substitutes for synthetic dyes like tartrazin. Extraction of curcuminoids from tumeric rhizomes with supercritical CO2 can be applied as an alternative method to obtain curcuminoids, as natural pigments are in general unstable, and hence degrade when submitted to extraction with organic solvents at high temperatures. Extraction experiments were carried out in a supercritical extraction pilot plant at pressures between 25 and 30 MPa and a temperature of 318 K. The influence of drying pretreatment on extraction yield was evaluated by analyzing the mass transfer kinetics and the content of curcuminoids in the extracts during the course of extraction. The chemical identification of curcuminoids in both the extract and the residual solid was performed by spectrophotometry. Mass transfer within the solid matrix was described by a linear 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 for curcuminoids during the supercritical extraction process was higher when the turmeric rhizomes were submitted to a drying pretreatment at 343 K.
Keywords: Extração
Secagem
Cinética
Produto natural
Curcuminoides
Dióxido de carbono
ISSN: 0104-6632
Appears in Collections:Artigos Científicos - FEQ/ITEC

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