One of the advantages of SFE is CO2 solvating power can be
manipulated by changing pressure (P) and/or temperature (T);
therefore, knowing the influence of extraction conditions on the
process is necessary to obtain high extraction yields. SC-CO2 extractionyields
obtainedatdifferent conditions of P and/or T frommango
leaves of the variety Osteen are shown in Fig. 2A. Global yields
obtained with pure CO2 were unsatisfactory and even changes in
the extraction conditions led to negligible improvements. The highest
yield was 1.22 ± 0.13% obtained at 40 MPa and 55 ◦C.
The effect of pressure on SC-CO2 extraction from mango leaves
was positive for both temperatures studied. This behavior can be
explained by the increase in density with pressure resulting in
greater solvating power of CO2 [16,17]. Moreover, high pressures
cause disruptions in plant cells and allow compounds to be more
available, thereby favoring the extraction yield [37].
About the effect of temperature, it is more complex because it
depends on two factors. The density of CO2 decreases with temperature,
reducing the solvating power, while the solute vapor
pressure increases favoring the solubility on SC-CO2. Thus, depending
on the operating conditions, one factor is dominant over the
other [16,17]. In this way, at low pressures (10 MPa) the effect
on the density was predominant, so high extraction yields were
obtained on reducing temperature. But, at high pressures (40 MPa)