关键词: 麻竹叶, 黄酮, 超滤, 聚砜膜

Abstract: The PSF-500 of polysulfone membrane with a molecular weight cut-off(MWCO) of 50000 had the best effect on purification of flavonoids from leaves of Dendrocalamus latiflorus by ultrafiltration(UF) in contrast with five other membranes.The yield of flavonoids is 4.29 % and the content is 44.123 %.The effects of filtration pressure,feed velocity of flow and runtime on the operation were tested and discussed.The results showed that the best parameters on the operation were filtration pressure 0.20～0.30 MPa,feed velocity of flow 0.4 m/s and runtime 12 h(the PSF-500 membrane must be cleaned after 12 h).At the same time,the recovery test of adding rutin was experimented with PSF-500 in UF system.The results indicated that average recovery is 97.0% and coefficient of variation is 1.94%.

Key words: leaves of Dendrocalamus latiflorus, flavonoids, ultrafiltration, polysulfone membrane