- Alkaline lysis
Alkaline lysis is a method used in
molecular biology to break cells open to isolateplasmid DNA or other cell components such asprotein s. Bacteria containing the plasmid of interest is first grown, then lysed with a strongalkaline buffer consisting of a detergentsodium dodecyl sulfate (SDS) and a strong basesodium hydroxide . The detergent breaks the membrane'sphospholipid bilayer and the alkali denatures proteins involved in maintaining the structure of the cell membrane. Through a series of steps involving agitation, precipitation, centrifugation, and the removal ofsupernatant , cellular debris is removed and the plasmid is isolated and purified. The protocol may vary slightly from lab to lab.Also, alkaline lysis is sometimes used to extract plant genetic material. The plant cells are subjected to a strongly alkaline solution containing a detergent (usually a
zwitterionic ornonionic detergent such as Tween 20), and the mixture is incubated at high temperature. This method is not used as often due to the sodium hydroxide's tendency to damage genetic material, reducing DNA fragment size.References
* [http://lifesciences.asu.edu/resources/mamajis/alkaline/alkaline.html Alkaline Lysis at Mama Ji's Molecular Kitchen]
* [http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pubmed&pubmedid=388356 A rapid alkaline extraction procedure for screening recombinant plasmid DNA] by H. C. Birnboim and J. Doly
Wikimedia Foundation. 2010.