| Optimal Concentration | 0.8-1.6M improves the amplification of DNA by reducing the formation of secondary structure in GC-rich regions |
|---|---|
| Application | PCR |
The performance of Betaine Enhancer Solution is superior compared to standard enhancers such as formamide, DMSO, TMAC, BSA and non-ionic detergents because of the following effects: Betaine binds preferentially to AT rich sequences in the major groove, thereby stabilizing AT rich regions of the DNA. Because AT forms 2 hydrogen bonds and GC forms 3, the bonding of AT is less stable than the one of GC. As a consequence of the stabilizing effect of Betaine on AT bonding, the stability of AT bonding and GC bonding is brought close to an equal level.
At the same time, Betaine has a sequence independent destabilizing effect on all DNA. The Tm of AT rich and GC rich sequences are equalized and the overall Tm is lowered.
Furthermore, Betaine aids the process of thermostable polymerases and reduces pauses in polymerization caused by secondary structure that can induce the polymerase to disassociate from the DNA strand.
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PCR技术类似于DNA的天然复制过程,其特异性依赖于与靶序列两端互补的寡核苷酸引物,由变性--退火--延伸三个基本反应步骤构成
2、仪器功能:进口和国产仪器主要功能:如保存,过温保护,断电保护,热盖功能等基本上是一样的,只是附带功能上有所差别,比如:进口的显示屏是大型的触摸式荧屏操作,国产的大多是触摸键,荧屏显示操作,进口仪器有的可以升级为荧光定量PCR仪,而国产的目前主要是专用机。而这些仪器附带功能的差别大多都是最近两年新推出来的,价格确是相差几倍。有的进口仪器没有这些附带的特殊功能,从性能和功能上比有的等于或低于国产的。
普通PCR的孔所有温度是一样的。

