OXIDATIVE SUSCEPTIBILITY AND THERMAL PROPERTIES OF MORINGA OLIEFERA SEED OIL OBTAINED BY PILOT-SCALE SUBCRITICAL AND SUPERCRITICAL CARBON DIOXIDE EXTRACTION

摘要

Oxidative stability, antioxidant activity and thermal properties of Moringa oleiferarn(MO) seed oil obtained by supercritical carbon dioxide (SC-CO2) extraction werernstudied in comparison with Soxhlet extraction. CO2 was used to extract the oil inrnthe pressure ranges from 15 to 40 MPa and the temperature ranges from 25 to 35Crnat 20 kg/h flow rate. SC-CO2 extraction at 35 MPa and moderate temperature ofrn30C resulted in the maximum relative oil yield of 75.27% (dry basis). Susceptibilityrnto oxidation of MO seed oil was expressed as the oxidative stability indexrn(OSI). The results indicated that MO seed oil extracted at higher pressure was lessrnsusceptible to oxidation. The oil obtained by Soxhlet extraction was significantlyrn(P < 0.05) more stable against oxidation compared with SC-CO2 extracted oils asrnshown by its stronger DPPH (1,1-diphenyl-2-picrylhydrazy) scavenging abilityrnand higher OSI. The thermal properties of oil samples from SC-CO2 extractionrnwere not substantially different from those of oils extracted using Soxhletrnextraction.