@article{ref1,
title="Measurement and modeling of the high-pressure phase equilibria of CO2-Oleoresin Capsicum",
journal="Journal of Supercritical Fluids",
year="2011",
author="Fernández-Ronco, M.P. and Gracia, I. and De Lucas, A. and Rodríguez, J.F.",
volume="57",
number="2",
pages="112-119",
abstract="Oleoresin Capsicum is one of the most important sources of natural colorants with a lot of applications in food industry due to its carotenoids concentration. With high content of lipid matter and a noticeable amount of capsaicinoids, Oleoresin Capsicum can also be used in pharmaceutical industry or for self-defense sprays. In this work, the phase equilibrium of Oleoresin Capsicum in supercritical carbon dioxide was measured by a recirculation method at pressures between 90 and 315bar and temperatures of 314.7, 326.4 and 337.8K. The experimental data were correlated using Soave-Redlich-Kwong (SRK) equation of state with Mathias-Klotz-Prausnitz as mixing rule, and binary interaction parameters were obtained. Moreover, the prediction of the pseudo-binary system CO<sub>2</sub>/Oleoresin Capsicum was carried out with the Group Contribution Equation of State (GC-EoS), using the set of binary group parameters established in a previous work. For all isotherms studied, the solubility of Oleoresin Capsicum in the gaseous phase and that of CO<sub>2</sub> in the liquid phase increases with an increase in pressure. Comparison between experimental data and those correlated by SRK or predicted by GC-EoS, shows that SRK correlation produced better fittings of the experimental data. Nevertheless, the importance of data predicted by GC-EoS is based on the possibility to obtain an approximation to the thermodynamic behaviour of the real systems without the necessity of experimental data.<p />",
language="",
issn="0896-8446",
doi="10.1016/j.supflu.2011.02.010",
url="http://dx.doi.org/10.1016/j.supflu.2011.02.010"
}