For comparison, air-dried aril was also used instead of the microwave-dried. The fresh aril (about 900 g) including the seeds within, was air-dried at 60 C for 18 h to reach a final moisture content of approximate 6% (wet basis) based on previous trials. The seeds were then removed by hand and the aril was powdered using the laboratory blender. The Gac oil extraction process using the powdered samples was then performed similar to that for microwave.
The fixed processing conditions were steaming time of 20 min and the hydraulic pressure of 170 kg/cm2
.