Effect of particle size on yield extract and antioxidant activity of peanut skin using modified supercritical carbon dioxide and soxhlet extraction

The objective of this study was to study and compare the effect of particle size on the modified supercritical carbon dioxide and soxhlet extraction in terms of oil yield and antioxidant activity. The mean particle sizes of 300, 355, 425, and 500 mu m for modified supercritical carbon dioxide extraction, the temperatures of 40 and 70 degrees C, pressure of 10 and 30 MPa, flow rate of CO2 3 mL/min, and rate of co-solvent 5% were used in this study. Meanwhile, for soxhlet extraction, the extraction time was 6 hr with ethanol, hexane, and water as the solvent. DPPH method was used to analyze the antioxidant activity of the extract. The results showed that 425 mu m gave the highest yield extract on the modified supercritical carbon dioxide extraction (15.53%), soxhlet extraction (36.28%), antioxidant activities for modified supercritical carbon dioxide (93.43%), and soxhlet extraction (62.21%). Single sphere model has successfully fitted the experimental data of modified supercritical carbon dioxide with error below 5% with the highest diffusivity coefficient was 6.794E-12 m(2)/s at operating conditions was 10 MPa, 40 degrees C and particle size 425 mu m.