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[求助] 蛋白纯化,浓缩透析后过柱,填塞料上层泛白,柱中的液体也不滴下来了,求高人解答

如题,由于蛋白表达量不高,所以老师建议,将培液浓缩透析后过柱,但过柱时,经常遇到填塞料上层泛白,柱中液体滴不下来的现象,有人知道是怎么回事么?怎么处理啊?上层泛白的是变性的蛋白质吗还是beads质变了?如有解答,无限感激啊!!!

蛋白纯化,浓缩透析后过柱,填塞料上层泛白,柱中的液体也不滴下来了,求高人解答
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