|
authors |
Zezere, B; Silva, JM; Portugal, I; Gomes, JRB; Silva, CM |
|
nationality |
International |
|
journal |
SEPARATION AND PURIFICATION TECHNOLOGY |
|
author keywords |
Astaxanthin; Squalene; Diffusion coefficient; Ethyl acetate; Pressurized liquid |
|
keywords |
BINARY DIFFUSION-COEFFICIENTS; SUPERCRITICAL-FLUID EXTRACTION; CARBON-DIOXIDE EXTRACTION; BIOACTIVE COMPOUNDS; SOLVENT SELECTION; INFINITE DILUTION; LENNARD-JONES; DENSE FLUIDS; HARD-SPHERE; WIDE RANGES |
|
abstract |
An increasing demand of consumers for natural bioactive compounds has boosted the interest of the scientific community for vegetables and fruits, with many efforts being made to identify new bioactive compounds and to develop sustainable extraction methods that preserve the compounds bioactivity. Such is thicase of pressurized liquid extraction and supercritical fluid extraction using green solvents as supercritical CO2, ethanol, and ethyl acetate. The accurate design of these processes requires the knowledge of transport properties, namely, diffusion coefficients, D-12. Astaxanthin and squalene are two bioactive compounds whose D-12 values were measured in compressed liquid ethyl acetate using a chromatographic technique. For astaxanthin the D-12 values were in the range 0.817 x 10(-5) - 1.223 x 10(-5) cm(2) s(-1) (at 303.15-333.15 K and 1-100 bar) and for squalene they were in the range 1.052 x 10(-5) - 1.822 x 10(-5) cm(2) s(-1) (at 303.15-333.15 K and 1-150 bar). The influence of tem- perature, pressure and Stokes-Einstein coordinate was studied for both systems and explained with the most relevant theories of the literature. |
|
publisher |
ELSEVIER |
|
issn |
1383-5866 |
|
isbn |
1873-3794 |
|
year published |
2020 |
|
volume |
234 |
|
digital object identifier (doi) |
10.1016/j.seppur.2019.116046 |
|
web of science category |
Engineering, Chemical |
|
subject category |
Engineering |
|
unique article identifier |
WOS:000491627200057
|
