Fatty Acid Content and Physicalchemical Properties of Cagaite Seed Oil (Eugenia dysenterica DC) Obtained by Different Extraction Methods

Cagaiteira, the fruit popularly known as cagaite, belongs to the Myrtaceae family. Seed oil cagaite (Eugenia dysenterica DC) was obtained by three methods of extraction, extraction using an ultrasound (OCU), extraction by mechanical pressing (OCP) and extraction with Soxhlet extractor (OCS) in 3 different times (3, 6 and 9 h) and the content of fatty acids and physicalchemical properties were compared. The rate of saturated fatty acids ranged from 19.46% (OCP03) to 31.18% (OCS09), while the amount of unsaturated fatty acids ranged from 54.72% (OCP03) to 67.64% (OCS09). Linoleic and linolenic acids, important in nutrition food, varied between 32.22-38.11 and 5.55-8.78%, respectively. For oxidative stability, OCUAq (heated ultrasound extraction) samples showed the highest induction periods, showing a positive correlation with antioxidant activity and phenol content, demonstrating the efficiency of the use of ultrasonic extraction to obtain quality oils from cagaite seeds.

俗称cagaite的Cagaiteira果实，其学名为Eugenia dysenterica DC，隶属于桃金娘科（Myrtaceae）。本研究以该物种的种子为原料，采用超声辅助提取法（OCU）、机械压榨法（OCP）以及索氏提取法（OCS，以索氏提取器Soxhlet extractor为工具）三种提取方式，并设置3、6、9小时三个不同提取时长制备cagaite籽油，随后对其脂肪酸组成与理化性质开展对比分析。饱和脂肪酸占比范围为19.46%（OCP03）至31.18%（OCS09），而不饱和脂肪酸占比则介于54.72%（OCP03）与67.64%（OCS09）之间。亚油酸与亚麻酸在食品营养中具有重要价值，其含量分别介于32.22%~38.11%与5.55%~8.78%之间。在氧化稳定性方面，加热超声提取法（OCUAq）制备的样品诱导期最长，且其抗氧化活性与酚类物质含量呈正相关，这证实了采用超声提取法从cagaite种子中提取优质籽油的有效性。