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碱裂解法小量提取质粒,加TE后,为什么不溶解?

爱情氧吧1984 2011-12-15 07:55:18 506  浏览
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  • First星曦十月 2011-12-16 00:00:00
    是不是TE有问题啊!

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  • 马杰830 2011-12-16 00:00:00
    手提的话,加入TE溶解的应该不是质粒,而是残余的变性蛋白质。问题不会出在TE,TE是水溶液,核酸是非常容易溶解的物质。顺便,小量质粒提取的话,纯度很好的质粒沉淀是肉眼不可见的,如果是明显的白色物质,就根本不是质粒而是蛋白质残余。你要确定你提取的有没有问题,你应该做两个实验,1是用分光光度计测A260/A280的比值,你这种情况蛋白质污染应该很多,这个值应该远小于1.8。2是做琼脂糖凝胶电泳。

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