Wood and industrial residue of candeia (Eremanthus erythropappus): Supercritical CO2 oil extraction, composition, antioxidant activity and mathematical modeling

• Higher temperature and pressure provided the highest extraction yields.
• Sovová model presented a good adjustment to the experimental data.
• Major compounds in the candeia oil were α-bisabolol and eremanthin.
• The highest α-bisabolol content is favored by the lowest density of the solvent.
• The oils extracted at 70 °C and 240 bar showed the highest antioxidant activity.

This study evaluated the extraction of oil from candeia wood (Eremanthus erythropappus) and industrial residue using supercritical CO2. Extractions were carried out at 40, 55 and 70 °C and 160, 200 and 240 bar, with a mass flow rate of 1.96 × 10−3 kg min−1. The oils were characterized for α-bisabolol content, chemical composition and antioxidant activity. The highest extraction yield obtained was 1.42 wt% for the candeia wood and 0.41 wt% for the residue, both at 70 °C and 240 bar. The Sovová model was used to represent the experimental kinetics of extraction. The major compounds identified in the candeia oil were the sesquiterpenes α-bisabolol, eremanthin and costunolide, and the highest α-bisabolol content (74.45 g from 100 g of oil) was obtained by the lowest density of the solvent. The highest values for antioxidant activity, determined by the DPPH, FRAP and ABTS methods, were found for oil extracted at 70 °C and 240 bar.

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