TITLE:
Apparent Solubility of Natural Products Extracted with Near-Critical Carbon Dioxide
AUTHORS:
Helena Sovová
KEYWORDS:
Supercritical Fluid Extraction; Solubility; Adsorption Isotherm; Vegetable Oils; Volatile Compounds
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.3 No.12A,
December
31,
2012
ABSTRACT: The apparent solubility controls the initial stage of
supercritical fluid extraction of natural products, which is most important
for the process economics. Based on the literature, data on CO2 apparent solubility of volatile substances from different matrices as leaves,
flowers, rhizomes and seeds were collected and compared with their
thermodynamic solubility. The adsorption isotherm derived by del Valle and Urrego as a
modification of the isotherm proposed by Perrut et al. is universal enough to interpret these data as well as the
apparent solubility of vegetable oils from seeds, for which it was originally
proposed. When the apparent solubility of minor extract components in CO2 is compared with their thermodynamic solubility, their fraction in the
extracted mixture should be taken into account.