【作者】 徐志红； 李磊； 武法文； 谭淑娟； 张志炳；

【Author】 XU Zhi-hong,LI Lei,WU Fa-wen,TAN Shu-juan,PENG Jing,ZHANG Zhi-bingDepartment of Chemical Engineering,Nanjing University,Nanjing 210093,China

【机构】 南京大学化学化工学院；

【摘要】 使用KMnO4作为强氧化剂,KOH作为强碱脱去聚偏氟乙烯(PVDF)链中的HF,再涂覆上聚乙烯吡咯烷酮(PVP)即可制得亲水性的PVDF-PVP膜。利用黄酮和PVP分子间的氢键作用,该超滤膜可以从银杏叶提取物(GBE)中精制银杏黄酮。实验表明GBE溶液的膜通量有显著的提高,透过液中黄酮的质量分数能够从初始的21.3%增加到34.8%。随着PH值的增加,透过液中黄酮的质量分数降低。透过通量在低压范围内随着压力线性增加,但是在高压下,由于浓差极化的影响,达到一个极限值。更多还原

【Abstract】 By using KMnO4 and KOH as oxidant and strong base to facilitate the HF-elimination from Polyvinylidene Fluoride( PVDF) chain,and polyvinyl pyrrolidone ( PVP) aqueous solution as a coating media,the hydrophilicPVDF-PVP ultrafiltration membrane was achieved.The modified membrane was used to further purify the flavonoids from the Ginkgo Biloba Extraction ( GBE) crude product by ultrafdtration,taking advantage of the hydrogen-bond effects between flavonoids and PVP function.Experiments showed that the flux of GBE solution was greatly improved and the flavonoids content in the final product could be purified to 34.8% from 21.3% in the GBE crude product,and the mass transfer of flavonoids decreased with increasing pH value of GBE solution.The flux of GBE solution increased linearly at low pressure and approached a steady state at high pressure because of the concentration polarization.更多还原