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【求助】镍柱再生时发生堵塞是什么原因?
【求助】镍柱再生时发生堵塞是什么原因?
昨天用镍柱纯化His蛋白,用250的咪唑洗脱的时候蛋白检测仪显示没有蛋白下来,考虑可能是柱子里镍不够了,就按说明书再生了一次。结果在用硫酸镍过柱了一段时间后发现滴速渐渐慢了,最后就几乎堵掉了~上硫酸镍前滴速正常的,柱子一直是埋在冰水里的,硫酸镍溶液肉眼检查过没有结晶才上的,只是过柱时没有装滤盘(因为虽然蛋白上样前用0.22的滤膜滤过一次,但上样时在滤盘那里还是有点堵过不去就把滤盘卸了,不过直到上硫酸镍前的滴速都没有问题的,感觉要是蛋白堵的话早在上样的时候就堵了,不会到再生的时候才堵啊)。
不知道是什么原因?有什么办法补救吗?急死了,这东西很贵的。。。
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【求助】镍柱再生时发生堵塞是什么原因?
【求助】镍柱再生时发生堵塞是什么原因?
最新回复
kuohao17 (2014-3-01 10:38:27)
is prepacked column or selfpacked column? if is prepacked, try use EDTA (50 mM) and salt (500 mM) to clean out Ni first, then 1 N NaOH, 6 M Gudm. if is self-packed, pour out the resin and wash with above reagent in a spinning dwon model, finally repack. don't worry, it happened to most people.
BTW, don't charge your column in ice and filter every solution you will put into column.
moonlight45 (2014-3-01 10:38:52)
kuohao17 (2014-3-01 10:39:12)
I foget one thing, when wash prepack column, remeber up-side-down your column and reversely pump fluid to clean the blocking stuff on top of column
hold住 (2014-3-01 10:39:32)
it's QIAGEN prepacked column. you mean i should now use your method to recovery my obstructed column, and then regenerate it according to the direction again?
hold住 (2014-3-01 10:42:25)
should i use your method every time i want to regenerate it? or just when it is obstructed? then what's the reason of obstruction?
hold住 (2014-3-01 10:43:07)
I see now, it's for blocking column!
3X bullbull~I will try~
gemei0115 (2014-3-01 10:43:34)
个人猜测楼主的柱子在缓冲液中,pH是碱性的,没用水清洗,直接上镍溶液导致沉淀,如果这样可以见到柱子的上端颜色和下面的不一样,处理方法是用1mM盐酸清洗柱子,直到沉淀溶解,柱子通了再按说明书方法再生即可.
hold住 (2014-3-01 10:43:55)
what's Gudm? 1N NaOH?"M"?
avi317 (2014-3-01 10:54:56)
处理柱子的时候。EDTA,NAOH每部洗完都要用足够的水冲到中性的
【求助】镍柱再生时发生堵塞是什么原因?