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BSA versus milk in blocking and antibody incubation


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5 replies to this topic

#1 jasmina

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Posted 30 November 2011 - 11:49 AM

I dont success to see a signal of my low molecular weight protein (16kda), I did 15% SDS-PAGE,and I blocked membrane in 5%milk, primary (monoclonal) and secondary incubations diluted in 5% milk as well.
Some people suggest to me to try BSA instead of milk .
Actually, I incubated again the same filter with antibody diluted in milk overnight 4°C.
I wonder if I can do secondary antibody diluted in BSA?? or I need to keep it in milk?
thanks

#2 mdfenko

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Posted 01 December 2011 - 11:22 AM

yes, you can.
talent does what it can
genius does what it must
i do what i get paid to do

#3 acquire

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Posted 05 December 2011 - 04:48 PM

luciana what happened to yor blot.i want to know the result.iam going to work on 17kd protein blotting in future.

#4 jasmina

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Posted 07 December 2011 - 08:53 AM

Hi,
after blocking again the filter with BSA 5% and antibody diluted in BSA. I got a signal with background.. But, I noticed that 15% isnt really necessary. I can keep 10% becos It seems that this protein has a trimer at 55kda. Iwasnt able to see 16kda!

#5 acquire

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Posted 08 December 2011 - 04:05 PM

washes do for 10 mins each 3times after blocking,primary ab incubation and secondary ab incubation,this will reduce back ground properly this happend to me. in your case trimer your telling but is your gel ,SDS reducing gel right? then how come trimer? have u heated sample for 5mins boiling before loading.?

Edited by acquire, 08 December 2011 - 04:05 PM.


#6 mdfenko

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Posted 09 December 2011 - 01:33 PM

washes do for 10 mins each 3times after blocking,primary ab incubation and secondary ab incubation,this will reduce back ground properly this happend to me. in your case trimer your telling but is your gel ,SDS reducing gel right? then how come trimer? have u heated sample for 5mins boiling before loading.?

i wouldn't worry about washing after blocking, especially if you prepare your primary antibody in the blocking buffer.
talent does what it can
genius does what it must
i do what i get paid to do




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