ultracentrifuge problems

Lesleigh Force L.Force at botany.uq.edu.au
Wed Dec 11 21:04:34 EST 1996


Hi everyone,

I'm having problems with ultracentrifuge tubes collapsing/breaking at 
the top during a run.  I'm using a Sorvall ultracentrifuge OTD75B with 
T-875 fixed angle rotor and 11.5ml ultracrimp tubes (cat. no. 03987).  
I'm trying to separate protein/pigment complexes of isolated thylakoids 
using a 9ml 0.125-1.0M sucrose gradient made up in 40mM MES-AMPD pH6.5 
(MES = 2[N-morpholino]ethanesulfonic acid, AMPD = 
2-amino-2-methyl-1,3-propanediol), 1% B-dodecyl-maltoside and 0.1mM 
phenylmethylsulfonylfluoride.  The tubes were spun at 4 c at 49000rpm 
for 20 hours.  No air layer was visible when I placed the tubes in the 
rotor.

Any ideas on how to prevent the tubes collapsing?

Thanks.

Lesleigh Force
PhD student
L.Force at botany.uq.edu.au




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