超滤深度提纯银杏黄酮

Further Purification of Ginkgo Biloba Flavones by Ultrafiltration

利用截留相对分子质量(MWCO)为10000的磺化聚醚砜(SPES)平板超滤膜对银杏黄酮提取物(GBE)粗原料产品进一步纯化分离,从w(银杏黄酮)=21 3%的粗原料中得到w(银杏黄酮)=39 2%的高纯GBE产品。实验测定了不同温度和压力下的超滤效果,结果表明:温度从30℃上升到40℃,透过通量从7 5L/(m2·h)上升到11 2L/(m2·h);压力从0 15MPa上升到0 25MPa,透过通量从6 1L/(m2·h)上升到10 0L/(m2·h),但是温度、压力的变化对选择性影响不大。

Experiments for further concentration of flavones from Ginkgo biloba extract were carried out by use of a sulfonated polyethersulfone ultrafiltration membrane with molecular weight cut-off of 10000.Concentration of total flavones in the filtrate can be elevated from w(flavones)=21.3% in the original extract to w(flavones)=39.2%.The effects of feed temperature and filtration pressure on the operation were tested and discussed.The results showed that the flux of ultrafiltration increased from 7.5 L/(m^2·h) to 11.2 L/(m^2·h) when the temperature varied from 30 ℃ to 40 ℃,and it increased from 6.1 L/(m^2·h) to 10.0 L/(m^2·h) as the pressure changed from 0.15 MPa to 0.25 MPa,but both temperature and pressure had little impact on the selectivity.