3Zhang Z S, Wang L J, Li D, et al. Ultrasound-assisted extraction of oil from flaxseed [J] . Separation and Purification Technology, 2008, 62 (1): 192-198.
4Fu C L, Tian H J, Li Q H, et al. Ultrasound-assisted extraction of xyloglucan from apple pomace [J] . Ultrasonics Sonochemistry, 2006, 13 (6): 511-516.
5Chen F, Sun Y Z, Zhao G H, et al. Optimization of ultrasound- assisted extraction of anthocyanins in red raspberries and identifi- cation of anthocyanins in extract using high-performance liquid chromatography-mass spectrometry [J] . Ultrasonics Sonochemistry, 2007, 14 (6): 767-778.