4. Conclusions
Different CA membranes loaded with PS were successfully produced
by supercritical phase separation and micronization of the active
principle was simultaneously obtained. This result allows using
these membranes in two ways: if a strong and fast microorganism
inhibition is required, the membrane at lower polymer content is
preferable, since PS release is faster; the other possibility is to use
membranes at higher polymer content, prolonging the inhibition
effect and the safety of the food.
Interpreting the results, the best combination to obtain the
longest PS release time is the maximum SC-CO2 solvent power and
the maximum CA concentration, that in this work correspond to
the CA membrane at 20% w/w, obtained at 250 bar and 35 °C.