原理上讲是没有区别的,但实际应用上个人认为还是有一些区别的。恒压电泳的过程中电流是不断减小的,也就是越跑越慢;而恒流电泳的过程中电压是不断变大的,也就是越跑越快。用恒压的可能分辨更好一些,因为刚开始浓缩的时候快一些不要紧,进分离胶后随着电泳进程电流逐渐下降,可以将蛋白较好的进行分离,减少弥散,而恒流的过程恰好相反(个人猜测,没做过比较)。我们实验室都跑恒压。作者: NBA 时间: 2013-6-27 16:02
本人最近用还原性及非还原性电泳跑胶,结果显示10,24kd,故得出结论为单体和二聚体形式(二聚体由于空间结果影响迁移率)。可是老外说非还原性电泳不能证明二聚体,让我寻找它法“ Other methods are required to demonstrate the degree of
association of the protein. ”还说,没有别的方法就不要得出二聚体的结论“If no other data is available, the conclusion that the protein is a dimer should be removed.”
本人最近用还原性及非还原性电泳跑胶,结果显示10,24kd,故得出结论为单体和二聚体形式(二聚体由于空间结果影响迁移率)。可是老外说非还原性电泳不能证明二聚体,让我寻找它法“ Other methods are required to demonstrate the degree of association of the protein. ”还说,没有别的方法就不要得出二聚体的结论“If no other data is available, the conclusion that the protein is a dimer should be removed.”
Smearing can have a variety of causes, but most commonly it is due to an unevenly poured acrylamide mixture or due to gross overloading of protein.
In this example the gel was not properly poured, so that the lower half had begun to polymerize before the upper part was poured. The first gel mix began to polymerize too quickly. Rather than prepare a new gel cassette, the students simply stopped pouring, prepared a new mix, and poured it on top of the old. Obviously, the bond wasn't particularly good.
谢谢楼主整理的资料和精心的解答
我也有一个问题:现在我做的胶总是出现皱眉”(两边向下中间鼓起)现象,您说是两板之间的底部间隙气泡未排除干净,可以可在两板间加入适量缓冲液,以排除气泡。我想知道,在灌胶之前先把缓冲液加入然后就开始灌胶,不能再把缓冲液倒掉,是这样的吗?
Thank you very much!作者: 3648755 时间: 2013-6-28 16:51
另外,2010版药典三部附录IV C SDS-聚丙烯酰胺凝胶电泳法中写道:“非还原电泳凝胶经扫描进行纯度分析;还原电泳凝胶中分子量标准,经扫描获得分子量标准曲线,计算供试品的分子量。”
我是否可以这样理解 :我公司产品含有三种蛋白,是混合物,因此不适合用非还原SDS-PAGE,因为非还原电泳凝胶是进行进行纯度分析的,无法分析混合物。然而如果用还原SDS-PAGE,就破坏了蛋白质的结构,无法进行灭活病毒前后蛋白质结构变化对比。我是不是理解错了?