膜技术分离纯化绿原酸提取液的研究

本实验研究了膜技术分离纯化绿原酸提取液的过程。首先,以透水通量为指标,比较了两种微滤膜MF1和MF2、两种超滤膜UF1和UF2及两种纳滤膜NF1和NF2对绿原酸提取液的过滤特性。结果表明,MF2膜的通量可高达167.7kg/h,UF2膜的通量可达148.8kg/h和NF2膜的通量可达109.8kg/h,分别明显高于MF1(103.6kg/h)、UF1(48.0kg/h)和NF1(45.6kg/h);其次,研究了浓缩液的水洗对绿原酸截留率的影响。结果表明,经一次水洗后,MF2膜的截留率可由12.5%降低到3.4%,UF2膜的截留率可由15%降低到8%;最后,分析了膜分离过程中各物料的成分。结果表明,纳滤浓缩液含绿原酸为17964mg/L,比原提取液提高了24.8倍,绿原酸的纯度由2.8%上升到27%。

Study on Purification of Chlorogenic Acid Extract from Steamed Fruit of Lonicera japonica Thunb. with Membrane Technology

The membrane technology to purify the chlorogenic acid extracts prepared from steamed fruit of Lonicera japonica Thunb. was studied in this paper. Taking the water penetration flux as index and comparing with two kinds of micro filtration membrane MF1 and MF2, two kind of ultra filtration membrane UF1 and UF2, and two kinds of nano filtration membrane NF1 and NF2, the filtration characteristics for the chlorogenic acid extraction were studied. Results indicated that the MF2 membrane flux reaches as high as 167.7 kg/h, while the UF2 membrane flux 148.8 kg/h and the NF2 membrane flux 109.8 kg/h, obviously higher than that of MF1 (103.6kg/h), UF1 (48.0kg/h) and NF1 (45.6kg/h), respectivly. Analysis results the contents of all liquids produced in the membrane separation showed that the concentration of chlorogenic acid in nano filtration concentrated solution is 17964mg/L, 24.8 times higher than that of originally extracted solution, and the purification of chlorogenic acid raises to 27% from 2.8% after multi membrane filtrations.