[問題] 酒精沉澱後DNA量減少...救命呀
作phenol/chloroform酒精沉澱之後
原本在電泳膠上看到約200ng per microliter的DNA
銳減為不到50ng per microliter
爬文過,也google過
但還是不明白原因
另外,在每條land都會有...DNA跑過的痕跡
也就是會有拖band的情形
可請問各位高手
有哪些點要注意呢?
我的步驟是:
把DNA體積加到200 microliter
加等體積的phenol/chloroform
vortex數秒
離心13K 5min
吸取上清液(到上清液變成一個完整的泡泡再吸一點...)
加入1/10體積的 3M NaOAc,1 ml冰的99.9%酒精
-80度冰箱冰o/n
4度離心13K 20min
倒去上清液
加常溫70%EtOH 0.5 ml
4度離心13K 5 min
倒去上清液
vaccum dry 10 min
ddH2O回溶
多謝!
(DNA一直被酒精沉澱沒收的可憐人)
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※ 編輯: ppppai 來自: 61.64.145.212 (07/06 02:10)
※ 編輯: ppppai 來自: 61.64.145.212 (07/06 02:12)
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