[求救] 解決置換buffer而蛋白沉澱
我的目標蛋白是從大腸桿菌破菌得到,藉由NI-NTA純化,最後用elution(50mM NaH2PO4,
300mM NaCl,250mM imidazole,pH 4)洗出蛋白,因為最後要置換成PBS(pH 4),所以
elution直接調成pH4而不是8,我的PBS是以50mM NaH2PO4 + 150mM NaCl與50mM H3PO4
+ 150mM NaCl互相調至pH 4,那是以濃縮管進行至換,可是置換後蛋白會有白色沉澱出
來,所以想請問大家由何種方法可以解決,我後續要用pH 4環境作用,ph無法辨更,
感謝大家的解答
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elution已經用pH 4來洗出蛋白,我再置換pH應該不會變化太大?
蛋白pI是5.23
※ 編輯: bill00202000 (140.120.104.80), 04/16/2016 20:04:36
※ 編輯: bill00202000 (140.120.104.80), 04/16/2016 20:06:04
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