摘要
The process which microwave is applied to dynamic multi-stage countercurrent extraction,namely the process of microwave dynamic multi-stage countercurrent extraction (MDMCE),for extracting dihydromyricetin from Ampelopsis grossedentata was investigated.Comparison of MDMCE and microwave static batch extraction (MSBE) demonstrated that both the driving force of mass transfer and extraction efficiency of MDMCE were higher than those of MSBE.The optimum extraction conditions of 5 stages MDMCE obtained by orthogonal design were as follows:10 min extracting time for 5 stages MDMCE(2 min for every stage), 110 ℃, 1∶30 material to solvent ratio, 600 W microwave power. Under these conditions the extraction yield of dihydromyricetin and percentage of dihydromyricetin in residue were 92.2 % and 3.1% respectively. A kinetic model of single vessel for MDMCE was developed and the functional relation between dihydromyricetin concentration and extraction time was ln(ΔC)=0.2985lnt-12.52.
The process which microwave is applied to dynamic multi-stage countercurrent extraction, namely the process of microwave dynamic multi-stage countercurrent extraction （MDMCE）, for extracting dihydromyricetin from Arnpelopsis grossedentata was investigated. Comparison of MDMCE and microwave static batch extraction （MSBE） demonstrated that both the driving force of mass transfer and extraction efficiency of MDMCE were higher than those of MSBE. The optimum extraction conditions of 5 stages MDMCE obtained by orthogonal design were as follows. 10 min extracting time for 5 stages MDMCE （2 min for every stage）, 110 ℃, 1 ： 30 material to solvent ratio, 600 W microwave power. Under these conditions the extraction yield of dihydromyricetin and percentage of dihydromyricetin in residue were 92.2 % and 3.1% respectively. A kinetic model of single vessel for MDMCE was developed and the functional relation between dihydromyricetin concentration and extraction time was ln（△C） = 0. 2985 lnt-12. 52.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2006年第2期376-379,共4页
CIESC Journal
基金
广东省教育厅自然科学基金重点项目(04Z007)
广东省科技计划项目(20055190001).~~
关键词
微波提取
动态循环阶段连续逆流提取
二氢杨梅素
藤茶
动力学模型
microwave extraction
dynamic multi-stage countercurrent extraction
dihydromyricetin
Arnpelopsis grossedentata
kinetic model
