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为验证微波场强化植物提取的“膜超滤”假说机理,以聚醚砜超滤膜为研究对象,以膜通量为考察指标,结合膜和黄芪饮片显微结构的扫描电镜(SEM)表征,讨论了微波辐射对黄芪水提液超滤过程的影响。结果表明,驱动压力相同,微波辅助超滤30 min时,膜通量下降到初始值的57.36%,且膜表面观察不到凝胶层;而常规超滤30 min,膜通量已下降到初始值的30.29%,且膜表面覆盖一层约20μm的凝胶层。说明微波辐射能够减弱浓差极化现象,促进膜超滤过程中的物质传递。
In order to verify the hypothesis of “membrane ultrafiltration ” extracted by microwave field-enhanced plants, polyethersulfone ultrafiltration membrane was taken as the research object, the membrane flux was taken as the index, and the microstructure of the membrane and the astragalus leaf was observed by SEM ) Characterization. The effects of microwave radiation on the ultrafiltration process of aqueous extract of Astragalus membranaceus were discussed. The results showed that the membrane flux decreased to 57.36% of the original value at the same driving pressure and microwave-assisted ultrafiltration for 30 min, and no gel layer was observed on the membrane surface. However, the membrane flux decreased to the initial value after 30 min of conventional ultrafiltration 30.29% of the value, and the film surface is covered with a layer of gel about 20 μm. Microwave radiation can weaken the phenomenon of concentration polarization, and promote membrane ultrafiltration process of material transfer.