Supercritical CO_2 extraction of gurum (Citrulluslanatus var. Colocynthoide) seed oil and its properties comparison with conventional methods

摘要

Lipid composition, physicochemical, antioxidant, and thermal properties of gurum seed oil obtained from supercritical CO2, screw pressing and hexane extraction were studied. Results showed that the highest yield of lipids was obtained by the hexane extraction (34.04%) as compared to supercritical CO2 (30.05%) and screw pressing (27.5%), respectively. The physicochemical properties of oil extracted by different methods are important criteria to select the oil for edible purpose. Supercritical CO2 gurum oil has higher linoleic acid composition in comparison to the screw press gurum oil and hexane gurum oil. Supercritical CO2 gurum oil and hexane gurum oil showed lower free fatty acid values (0.60 and 0.46%, respectively). Supercritical CO2 gurum oil has shown higher amounts of (C18:1-C18:1-C18:2)-TAG. Supercritical CO2 gurum oil has excellent properties, especially in the terms of polyphenol, beta-tocopherol, ergosta-7, 22-dein-3-ol, and antioxidant activity. Thus, suggesting the supercritical CO2 gurum oil as desired alternative for extracting fats with altitude nutritional value, while keeping bioactive compounds intact. Practical applications This study is beneficial for extraction of oil from seeds. Supercritical CO2 fluid extraction (SFE) is quite demanding technique on the industrial scale. SFE is a novel method to extract the oil from gurum seed and can be used in various fields such as food and pharmaceutical industries. The presented results revealed that gurum seed oil extracted by SFE could be the desired alternative for extracting fats with altitude nutritional values while keeping intact healthier bioactive compounds for wellbeing of human health.