摘要
采用双频超声强化从海金沙中提取黄酮的研究结果显示:在27℃,海金沙质量与乙醇体积比为0.05g/ml,搅拌器转速、超声功率及频率不变的条件下,质量浓度达到平衡时的60%,搅拌提取需700min以上,槽式超声需105min,探头式超声需45min,而双频超声所需时间不到20min;若提取时间均为60min,则双频超声的提取率为搅拌的11倍,为槽式超声的2倍,为探头式超声的1.8倍。通过选择乙醇浓度、溶剂用量、超声作用时间、浸泡时间因素进行正交实验,得出双频超声提取最佳工艺条件:浓度70%用量为40ml的乙醇,超声作用时间30min,浸泡时间为4h。机理探讨表明,当两束超声波同时传播时,超声作用的均匀性增强,声强增大,使得海金沙颗粒的边界层变薄,外表面剥落,甚至使其颗粒发生碎裂,传质速率大大提高,试验结果表现为双频超声对提取过程具有协同增强作用。
This paper studies extraction of flavone from Lygodium japonicum （Thunb.） Sw. assisted by bifrequency ultrasound under various conditions. The result shows that, with the same concentration, stirrer needs more than 700mins, tank modes ultrasound 105mins, probe model 45mins, and bifrequency ultrasound less than 20mins. The optimum estraction conditions of flavonoids were investigated by using an orthogonal experimental design. The mechanism indicates that the bifrequency ultrasound can make the Nernst layer thin, flake the exterior surface, crack the particle and improve the effect of extraction. This is shown in the result of experiment by bifrequency uhrasound＇s muhiplicative effect in the extraction process.
出处
《声学技术》
CSCD
北大核心
2006年第3期209-213,共5页
Technical Acoustics
基金
广东省科技计划项目(2003B31709)
关键词
双频超声
搅拌
槽式超声
探头式超声
bifrequency ultrasound
stir
tank model ultrasound
probe model ultrasound
