Welcome To Our Company
china  中文
You are here: Home » News » Industry encyclopedia » Why precipitate DNA with absolute ethanol?

Why precipitate DNA with absolute ethanol?

Views: 135     Author: Site Editor     Publish Time: 2019-10-30      Origin: Site

facebook sharing button
twitter sharing button
line sharing button
wechat sharing button
linkedin sharing button
pinterest sharing button
whatsapp sharing button
sharethis sharing button

Why precipitate DNA with absolute ethanol?

The DNA was precipitated with absolute ethanol, which is the most commonly used method for precipitating DNA in experiments.The advantage of ethanol is that it can be miscible with water in any ratio. Ethanol and nucleic acid do not react chemically and are safe for DNA, so it is an ideal precipitant.

absolute ethanol

95% ethanol can also replace absolute ethanol

The DNA solution is stably present in a hydrated state. When ethanol is added, ethanol will deprive water molecules around the DNA, making the DNA dehydrated and easily polymerized. In the general experiment, 2 times the volume of anhydrous ethanol is mixed with the phase, and the final content of ethanol accounts for about 67%. Therefore, 95% ethanol can be used instead of absolute ethanol (because the price of anhydrous ethanol is far more expensive than 95% ethanol). However, adding 95% ethanol increases the total volume, and DNA has a certain degree of dissolution in the solution, so the DNA loss also increases, especially when it is precipitated with multiple times of ethanol, it will affect the yield. The compromise is to use 95% ethanol instead of anhydrous ethanol to precipitate the DNA for the first time. The final precipitation step uses anhydrous ethanol. It is also possible to selectively precipitate DNA with 0.6 volumes of isopropanol. Usually it is allowed to stand at room temperature for 15-30 minutes.





  Yonghua
  yonghua@yonghuachem.com
   Room B-1308, International Trade Center, No. 12 Huanghe Road, Changshu City, Jiangsu Province 


Be the first to know about our lastest products.

Copyright 2020 Yonghua Chemical Co., Ltd.