Fang Yizhou, Gu Saiqi, Liu Shulai, Zhang Jianyou, Ding Yuting, Liu Jianhua
Department of Food Science and Engineering, Ocean College, Zhejiang University of Technology Hangzhou 310014 P. R. China
RSC Adv. 2018 Jan 12;8(5):2723-2732. doi: 10.1039/c7ra12948c. eCollection 2018 Jan 9.
The purpose of this paper is to explore the possibilities of subcritical dimethyl ether extraction (SDME) of oil from tuna liver with high-moisture content. The results showed that the oil and water were successfully co-extracted from the liver, and could be easily separated by centrifugation. In addition, the response surface method was employed to optimize the process parameters of SDME, including temperature/pressure, time and stirring speed. It was predicted that a temperature/pressure of 42/0.80 °C/MPa, time of 50 min and stirring speed of 925 rpm were the optimum within the experimental ranges, with an oil yield of 17.46 ± 0.23%. Furthermore, supercritical carbon dioxide extraction (SC-CO) was studied comparatively. Only minor differences were observed between the oils extracted by SDME and SC-CO, which indicated the high-quality of the SDME-oil. With no freeze-drying procedure and the relatively low pressure used in SDME, SDME could be a promising technique for extraction of marine fish liver oil.
本文旨在探讨采用亚临界二甲醚萃取法（SDME）从高水分含量的金枪鱼肝脏中提取油脂的可能性。结果表明，油脂和水成功地从肝脏中共同萃取出来，并且通过离心可以轻松分离。此外，采用响应面法对SDME的工艺参数进行优化，包括温度/压力、时间和搅拌速度。预测在实验范围内，温度/压力为42/0.80 °C/MPa、时间为50分钟、搅拌速度为925转/分钟是最佳条件，油脂得率为17.46±0.23%。此外，还对超临界二氧化碳萃取法（SC-CO）进行了对比研究。SDME法和SC-CO法所提取的油脂之间仅观察到微小差异，这表明SDME法提取的油脂质量较高。由于SDME法无需冷冻干燥步骤且使用的压力相对较低，因此它可能是一种很有前景的海洋鱼肝油脂提取技术。
