Li Zhi-Cheng, Zhang Zhen-Shan, Xia Ying, Han Jin-Tao, Chang Hua-Zhang, Wang Hui-Min
College of Food Science and Technology, Henan University of Technology, No. 100, Lianhua Street, Zhengzhou 450001, China.
College of Food Science and Technology, Henan University of Technology, No. 100, Lianhua Street, Zhengzhou 450001, China.
Ultrason Sonochem. 2025 Jan;112:107191. doi: 10.1016/j.ultsonch.2024.107191. Epub 2024 Dec 9.
Tiger nuts are rich in both oil and starch. In this paper, an immiscible binary solvent consisted of water and hexane was used to separate oil and starch from tiger nut with the assistance of ultrasound. The effects of various factors including ultrasonic power, ultrasonic time, extraction temperature, water-hexane ratio and solid-liquid ratio on the oil yield were examined. The oil and starch obtained were characterized and compared with those obtained through conventional methods, such as mechanical pressing (MP) and solvent extraction (SE). The results indicated that all examined factors, especially water-hexane ratio significantly affected the oil yield. Under the optimum conditions, ultrasound-assisted immiscible binary solvent extraction (UASE) yielded more oil than SE and MP. The quality analysis revealed that the acid value and iodine value of UASE oil were comparable to those extracted using the MP and SE methods, but the peroxide value was lower, and the vitamin E content was higher. In addition, the starch from tiger nut after UASE exhibited lower viscosity, greater solubility and swelling power, and better thermal and freeze-thaw stability. This study demonstrated that the UASE method is an efficient and environmentally friendly technique for simultaneously extracting oil and starch from tiger nuts.
油莎豆富含油脂和淀粉。本文采用水和正己烷组成的不互溶二元溶剂，在超声辅助下从油莎豆中分离油脂和淀粉。考察了超声功率、超声时间、提取温度、水-正己烷比例和固液比等各种因素对油脂得率的影响。对所得的油脂和淀粉进行了表征，并与通过传统方法（如机械压榨（MP）和溶剂萃取（SE））获得的油脂和淀粉进行了比较。结果表明，所有考察因素，尤其是水-正己烷比例对油脂得率有显著影响。在最佳条件下，超声辅助不互溶二元溶剂萃取（UASE）法所得油脂比溶剂萃取法和机械压榨法更多。品质分析表明，UASE法所得油脂的酸值和碘值与MP法和SE法相当，但过氧化值较低，维生素E含量较高。此外，UASE法后油莎豆中的淀粉表现出较低的粘度、较高的溶解度和膨胀力，以及较好的热稳定性和冻融稳定性。本研究表明，UASE法是一种从油莎豆中同时提取油脂和淀粉的高效且环保的技术。
