Help: stripping northern blots

[Jorge L. Sepulveda]

Hi, netters,

I have been using Zeta-probe nylon membranes and pre-hyb/hybridizing at 
65¡C in a solution containing 7% SDS. I get very high signal to noise 
ratio with no background at all. The problem is that I can't stripp the 
probes (boiling in water for 20' or heating overnight at 65¡C in 80% 
formamide hardly knocks off any counts from the membrane). And yes, I 
don't let the membrane dry at any time. The probes are not even homologous 
(e.g. human GAPDH for rat RNA). 

Thanks for any clues.


Jorge L. Sepulveda, 

Dept. of Pathology,                        Email: Jorges at bcm.tmc.edu
Baylor College of Medicine                 Telephone: 713-798-7330
One Baylor Plaza, Houston, TX 77030        Telefax: 713-798-5838