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problem in western blotting, picture attached


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4 replies to this topic

#1 kedar

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Posted 21 April 2010 - 01:28 AM

Hello all, ;)

I did a western yesterday. and instead i found these spots instead of bands. Can anybody tell me what could have gone wrong. blocking - milk in tbs-t.
http://img535.images...11119025123.jpg
please zoom out to make it clearer. thatäs the scan i have :)

many thanks in advance

kedar

Edited by kedar, 21 April 2010 - 01:31 AM.


#2 bob1

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Posted 21 April 2010 - 04:52 PM

Looks like you either added antibody directly to the membrane so that it all bound in one spot (dilute them before adding), or the substrate wasn't mixed properly.

#3 kedar

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Posted 22 April 2010 - 12:54 AM

Looks like you either added antibody directly to the membrane so that it all bound in one spot (dilute them before adding), or the substrate wasn't mixed properly.


Hi Bob1,

thanks for the reply. i dilute the primary- 1:200 and seconbdary antibody 1:10000 in blocking buffer(5% milk in tbst).

substrate- not mixed.--- may be...but you can imagine the odds here, the substrate is from biorad-immune star HRP luminol enhancer, i just need to mix it with buffer and submerge the blot ...which i did...

any more ideas?

thanks'kedar

#4 Inmost sun

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Posted 22 April 2010 - 08:45 AM

Hello all, :D

I did a western yesterday. and instead i found these spots instead of bands. Can anybody tell me what could have gone wrong. blocking - milk in tbs-t.
http://img535.images...11119025123.jpg
please zoom out to make it clearer. thatäs the scan i have :P

many thanks in advance

kedar


contamination of film cassette or the plastic cover?
did you stain with Ponceau S to show proper transfer of the polypeptides to the blot?
the best is to strip the blot and repeat it;

#5 kedar

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Posted 22 April 2010 - 09:39 AM

[/quote]

contamination of film cassette or the plastic cover?
did you stain with Ponceau S to show proper transfer of the polypeptides to the blot?
the best is to strip the blot and repeat it;
[/quote]


Hi Inmost sun',

Great... there is a possibility of that... cause i have used the same plastic for months now.. i will strip the blot and repeat it.

thanks for the point!:lol:

kedar




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