期刊
JOURNAL OF SUPERCRITICAL FLUIDS
卷 55, 期 3, 页码 971-976出版社
ELSEVIER
DOI: 10.1016/j.supflu.2010.09.030
关键词
Rosemary; Antioxidants; Supercritical carbon dioxide; Extraction; Modeling
资金
- Universidad Autonoma de Madrid
- Comunidad Autonoma de Madrid [ALIBIRD-S2009/AGR-1469]
- Ministerio de Ciencia e Innovacion, Spain [CSD2007-00063]
Rosmarinus officinalis (rosemary) extracts were obtained in a supercritical pilot-scale plant. Based on experimental information available in the literature for analytical or low-scale processes, extraction temperature and pressure were selected to be 313K and 30 MPa. At these extraction conditions, the kinetic behavior of the pilot-scale overall extraction curve were determined with respect to yield, antioxidant activity and carnosic acid content. The overall extraction curve was represented using Sovova's model; the average deviation between measured and calculated yields was lower than 2%. Mass transfer coefficients in the fluid and solid phases were determined and were compared with previous data reported in the literature for low-scale rosemary supercritical extraction. A two-stage depressurization procedure was accomplished and the effect of both on-line fractionation and extraction time on the antioxidant activity of the samples collected was studied. The antioxidant activity of the different fractions could be straight correlated with the carnosic acid content with a regression coefficient of 0.92. (C) 2010 Elsevier B.V. All rights reserved.
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