Purifying Plasmid DNA from Bacterial Colonies Using the Qiagen Miniprep Kit

Published 7/29/2007
6 Comments
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Biology

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Summary

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Zhang, S., Cahalan, M. D. Purifying Plasmid DNA from Bacterial Colonies Using the Qiagen Miniprep Kit. J. Vis. Exp. (6), e247, doi:10.3791/247 (2007).

Abstract

Plasmid DNA purification from E. coli is a core technique for molecular cloning Small scale purification (miniprep) from less than 5 ml of bacterial culture is a quick way for clone verification or DNA isolation, followed by further enzymatic reactions (polymerase chain reaction and restriction enzyme digestion). Here, we video-recorded the general procedures of miniprep through the QIAGEN's QIAprep 8 Miniprep Kit, aiming to introducing this highly efficient technique to the general beginners for molecular biology techniques. The whole procedure is based on alkaline lysis of E. coli cells followed by adsorption of DNA onto silica in the presence of high salt. It consists of three steps: 1) preparation and clearing of a bacterial lysate, 2) adsorption of DNA onto the QIAprep membrane, 3) washing and elution of plasmid DNA All steps are performed without the use of phenol, chloroform, CsCl, ethidium bromide, and without alcohol precipitation. It usually takes less than 2 hours to finish the entire procedure.

Disclosures

The authors have nothing to disclose.

Comments

6 Comments

  1. A very helpful and clear demonstration. Thanks!

    Reply
    Posted by: Anonymous
    January 22, 2008 - 9:33 PM
  2. With this kit is it best to do an alcohol precipitation after or unnecessary?   Thank you

    Reply
    Posted by: Anonymous
    November 4, 2008 - 7:26 AM
  3.   Hello from QIAGEN, There is no need to do an alcohol precipitation after this procedure - the DNA is ready to use as eluted from the QIAprep column. You can see the handbook for this kit online here if you would like:     http://www1.qiagen.com/literature/handbooks/literature.aspx?id=1000²48 -QIAGEN Technical Service     http://www1.qiagen.com/Contact/QIAGENWorldWide.aspx

    Reply
    Posted by: Anonymous
    November 4, 2008 - 8:18 AM
  4. By using this kit, what can I do if I'd like to increase the yield of plasmid with a low copy number? What is the maximum volume of culture that can be harvested?
    Thank you very much.

    Reply
    Posted by: Soon Keat O.
    July 18, 2009 - 10:51 AM
  5. Your demonstration is very good but you didn't mentioned the volumes of buffer added and the speed and time of centrifuge

    Reply
    Posted by: Anonymous
    March 2, 2010 - 10:40 AM
  6. Thanks for doing that video. There's not a lot of theory in there, but it is surely helpful for beginners. I'm holding onto it for future coworkers.

    Reply
    Posted by: Anonymous
    March 23, 2010 - 5:02 AM

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