Extracts from red Araca (Psidium cattleianum) fruits: extraction process, modelling and assessment of the bioactivity potentialities.

Extractions of red Araca were carried out using supercritical CO₂, hydrodistillation and petroleum ether. Second-order kinetic model was able to correlate the experimental data. The best extraction yield (2.86 wt%) was obtained at 60°C and 25.0 MPa. The essential oil had the highest total antioxidant activity (TAA) (8.10g_{α-tocopherol} g_extract^-1), but the lowest reducing power as measured by the Folin-Ciocalteau test and lowest activity in the DPPH test. All scCO₂ extracts and essential oil showed inhibitory effects on S. aureus and L. monocytogenes. The major compounds in scCO₂ extracts were caryophyllene, selina-3, 7 (11)-diene and e-nerolidol, while for the essential oil were caryophyllene, eucalyptol and selina-3, 7 (11)-diene. Statistical correlations were found between monoterpenes in the essential oil and activity against Gram-negative strains and TAA. In contrast, the higher yield for scCO₂ extraction increased the reducing capacity and antiradical activity which...