with minor modifications. Briefly, in the SFE
unit (in-house built equipment), the liquid CO2 (food grade) is
delivered from a standard cylinder, cooled (≈273 K), and
compressed with a high-pressure pump (air-driven piston
pump, model M71, Haskel) to an extraction pressure of
14 MPa. Compressed CO2 is heated up to 40 °C through a
stainless steel coil and enters the extraction cell containing the
plant material which is placed inside an oven with ventilation
and temperature control.