Although the extraction yield with 75% ethanol was very similar to the Soxhlet extraction, the quality of the extract is different,being found 420.8 mg GAE/gextrato and 387.43 mg GAE/gextrato,respectively.
Probably the percentage of CO2 and the temperature and pressure conditions favoring extraction, since ethanol is at supercritical temperature and subcritical pressure, 6.06 MPa and 241 C (Nimed, 2009).