3.1.1. CO2 pressure effect
An increase of oil yield with increasing pressure is
observed (Table 2). This result is in accordance with
classical observations in supercritical fluid extraction,
where yield increases with increasing CO2 pressure [28].
Considering mass proportions between the three phases,
no impact of pressure is noticed. For the total polyphenol
content of oil, the highest total polyphenol content
(350 50 mg GAE/kg oil) is obtained at the highest pressure
(53.8 MPa). This result is consistent with observations made
by Passos et al. [17]. The authors also noticed a positive
impact of pressure increase on the antioxidant capacity of
extracts