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Posted by: cariboeck Jan 26 2005, 09:44 AM

Hi! I have stained with sucess a protein with 27 KDa, but when I tried use the membrane again to stain other protein, I observed the last bands.
How can I remove Ab 1st stained from my membranes? I have ised strip with NaOH 0.1M.
Thanks

Posted by: badcell Jan 26 2005, 10:31 AM

You can try 62.5 mM Tris pH 6.8, 2% SDS and 100 mM 2-mercaptoethanol. Incubate the membrane at 50ºC for 30 min with ocassional agitation and then wash with TBST and block again.

Posted by: Al Bunsy Jan 28 2005, 10:04 AM

5 min H2O
5-10 min 0.2 H NaOH
5 min H2O

Works good.

Posted by: Gin Mar 31 2005, 05:30 AM

Hi all,
Usually, after I do the 1st stripping, all most proteins in the membrane disappeared ( I checked it by staining that membrane with Ponceau solution) or just remained a little.

The contents of stripping buffer I used is:
+ 0.2 M Glycine (pH 2.5)
+ 0.05% Tween 20

I incubated the membrane at 80oC for 30 minutes. And then, I washed it 10 min x 3 times with TBST before blocking with skim milk.

What's wrong in my method and how can I solve the problem?

Thank you!

Posted by: fred_33 Mar 31 2005, 06:21 AM

hi
i start to see same problems as you and i use the same protocol of stripping. Hence i'm wondering is "our" glycine too old? mine is more than 3 month...

but for stripping protocol, there was a discussion http://www.protocol-online.org/forums/index.php?showtopic=5449&st=0&p=11897&#entry11897
from protein and proteomics forum

fred

Posted by: Gin Mar 31 2005, 06:48 AM

Hi Fred,
Thanks for your reply.
Well, but I don't think so. Because another person who taught me that method, he also used the same Glycine with me. And of course, no matter Thus, I considered the pH of buffer, or the incubate-temperature, or the shaking... are they important to the result of stripping?

When you had that problem, how can you overcome it, Fred? You changed with "new" glycine?

Gin,

Posted by: fred_33 Mar 31 2005, 07:58 AM

hi
i think ph is not that important caus i use pH 2.7 at 80°C for 30'
but the two last stripping were not by shaking i must admit, and the residual bands apperead just in the pas times.
hence i assume that shaking would increase efficiency