An investigation of physicochemical properties of Nigella sativa seed oil from Al-Qassim, KSA was conducted using cold press and Soxhlet extraction methods. The effect of solvent polarity on the oil components and properties were examined using hexane, tetrahydrofuran, ethanol, dichloromethane, methanol and methanol-water binary system. The results demonstrated a high yield of oil with the Soxhlet method using ethanol (40.16%) while the samples extracted with the methanol–water binary system produced the lowest yield (28.28%). Linoleic acid was the major free fatty acid in all samples followed by oleic and palmitic acids. Moreover, the triacylglycerol analysis was carried out using a high-performance liquid chromatography system. The results revealed that the studied oil samples were rich in unsaturated triacylglycerols mostly as 3 Linoleic acid (LLL) but low in saturated triacylglycerols. Thymoquinone, which is known as a powerful antioxidative and antiradical agent was detected in all samples except the sample extracted with the methanol–water binary system. The effect of solvent polarity and the solvent boiling point was observed through the quantity of the main components of each oil sample even though they are from the same source of seed. This study showed that the aforementioned properties were affected by the polarity of the solvent used during the extraction process.

紫花苜蓿的理化性质研究使用冷压和索氏提取法从KSA Al-Qassim提取种子油。使用己烷，四氢呋喃，乙醇，二氯甲烷，甲醇和甲醇-水二元体系检查了溶剂极性对油成分和性能的影响。结果表明，使用乙醇的索氏提取法可高产石油（40.16％），而用甲醇-水二元系统萃取的样品收率最低（28.28％）。亚油酸是所有样品中的主要游离脂肪酸，其次是油酸和棕榈酸。此外，使用高效液相色谱系统进行三酰基甘油分析。结果表明，所研究的油样富含不饱和三酰基甘油，主要为3亚油酸（LLL），而饱和三酰基甘油含量较低。胸腺醌 在用甲醇-水二元系统萃取的样品中，所有样品中均检测到了一种称为强效抗氧化剂和抗自由基剂的化合物。即使每种油样品的主要成分来自相同的种子来源，也可以通过它们的量观察到溶剂极性和溶剂沸点的影响。这项研究表明，上述性质受萃取过程中所用溶剂极性的影响。