Phase equilibrium data for systems composed of oregano essential oil compounds and hydroalcoholic solvents at T=298.2 K

Author(s)

Capellini, Maria C. ^[1] ; Carvalho, Fernanda H. ^[1] ; Koshima, Cristina C. ^[1] ; Aracava, Keila K. ^[1] ; Goncalves, Cintia B. ^[1] ; Rodrigues, Christianne E. C. ^[1]

Affiliation

^[1] Dept Food Engn ZEA FZEA, Separat Engn Lab LES, BR-13635900 Pirassununga, SP - Brazil

• Document type: Journal article
• Source: JOURNAL OF CHEMICAL THERMODYNAMICS; v. 88, p. 61-71, SEP 2015.
• Web of Science Citations: 11

Abstract

The deterpenation process of essential oils consists of terpene removal and a consequent concentration of oxygenated compounds, which increases the sensorial quality, the aromatic potential and the oxidative stability of the oil. Deterpenation of oregano (Origanum vulgare L., Lamiaceae) essential oil, which has been used extensively as a popular medication and as an antimicrobial, antifungal, antimutagenic and a powerful antioxidant agent, can be performed by (liquid + liquid) extraction using hydroalcoholic solvents. This research presents (liquid + liquid) equilibrium data for model systems composed of p-cymene, thymol, terpinen-4-ol and alpha-terpineol, some of the main components of oregano essential oil, using hydrous ethanol as the solvent with the water mass fraction ranging from 0.28 to 0.41 at T = (298.2 +/- 0.1) K. The results show that an increase in the hydration of the alcoholic solvent causes a negative influence on the values of the distribution coefficient for the three oxygenated compounds (thymol, terpinen-4-ol and alpha-terpineol), with an increase in solvent selectivity. An increase in the content of oxygenated compounds in the terpene-rich phase reduces their distribution coefficients and the selectivity values. In addition, binary interaction parameters were estimated correlating the experimental data using the NRTL and UNIQUAC thermodynamic models, and the global deviations were lower than 0.0060 for all systems, indicating that both molecular models show a good descriptive performance. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 11/02476-7 - Essential oils deterpenation by solvent extraction: experimental study and process simulation
• Grantee: Christianne Elisabete da Costa Rodrigues
• Support type: Regular Research Grants
• FAPESP's process: 10/20789-0 - Deterpenation of essential oils by liquid-liquid extraction using a perforated rotating disc column: experimental study and process simulation
• Grantee: Cristina Chiyoda Koshima
• Support type: Scholarships in Brazil - Doctorate
• FAPESP's process: 09/17271-1 - Liquid-liquid equilibria study for systems composed by components of origanum essential oil and alcoholic solvent
• Grantee: Maria Carolina Capellini
• Support type: Scholarships in Brazil - Scientific Initiation