Fragility of plasmids: size limit for shaking/vortexing?

Alexander Kraev kraev at
Wed Feb 5 14:04:15 EST 1997

In article <32F88C97.1431 at>, K.Mulcahy at wrote:

 However, one of my plasmids is 10.5 
> kb. Does anyone know if plasmids (pre-linearised) which are this large 
> can be shaken vigorously without causing cleavage of the linear DNA 
> fragment? If not, then what is the best way to extract them with 
> phenol:chloroform?

There is no upper limit as long as there is no standard for "vigorous
shaking by hand".
If you are worried about breakage, try Centriflex-AG cartridge from AGTC:
all you need is to centrifuge your sample through it ,  protein is trapped
in the cartridge.
Tel 001-301-990-2685, Cat No 10319. No affiliation.

Alexander Kraev, PhD
Biochemie III, ETHZ Zurich
Phone 41-1-632-31-47
Fax 41-1-632-12-13
e-mail kraev at

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