logand at msdos.montpellier.inra.fr
Mon Feb 27 05:38:27 EST 1995
>I have been looking for a procedure to stain nitrocellulose membranes
>after transferring proteins from the polyacrylimide gel. I have managed
>to find out that I can use Coomassie, Amido Black, or Ponceau S, but I am
>unable to determine the advantages to each method. I don't necessarily
>care if the stain is reversible, and we are amplifying the protein of
>interest, so I don't think concentration should be a problem.
>Any insights? Does anyone have a preferred stain?
Amido black is more sensitive than Ponceau S, also Ponceau S is difficult
to record photographically (also it's not permanent)- however fine for
marking positions of Mol. Wgt. markers before immuno-detection. Ponceau S
is the quickest - pour on, agitiate (the blot) for few mins., pour off,
wash in water and voila! Amido black may distort the NC since the gel is
destained in 90% methanol 2% acetic acid.
India ink is most sensitive and cheap - I'd choose it over amido black.
Choosing between India ink and Ponceau S depends on the need for permanence
I'd forget Coomassie as it distorts the membrane and can give high
Hope this helps.
David C. Logan
Logand at msdos.inra.montpellier.fr
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