- 期刊
- OpenAccess
Optimisation of Process Parameters for Supercritical Carbon Dioxide Extraction of Oil from Gac Seed Kernel Powder
摘要
This study aimed to maximize the oil yield from Gac seed kernels using supercritical carbon dioxide (SC-CO_2) extraction. Gac seed kernel powder (4 g) with particle diameters ＜500 μm was extracted for 32 min. Response surface methodology with central composite design was used to optimize the SC-CO_2 extraction parameters: temperature (60-80°C), pressure (5,000-7,000 psi (34,474-48,263 kPa)) and SC-CO_2 flow rate (1-2.5 mL/min). The oil yield, accurately represented by a second order equation (R^2 = 0.99, p＜0.0001), was predicted to be most substantially and significantly influenced by temperature (p＜0.0001), followed by pressure (p＜0.02) but not by the CO_2 flow rate (p = 0.20). The optimum conditions were predicted to be: temperature of 73°C, pressure of 5,900psi (40,679kPa) and CO_2 flow rate of 1.5 mL/min. The optimum oil yield was predicted to be 34.1±0.8% (g oil/100 g Gac seed kernel powder) and experimentally validated at 33.9±0.5%. The oil was likely high in saturated fat, being solid at room temperature and having a low iodine value, with 33.2±1.1% being unsaponifiable matter.