Measurements of the amount of biotin conjugated to DNA

H.V.Taylor harold.taylor.delete-this at
Fri Feb 9 08:52:36 EST 2001

sleboda at ("Jowita Sleboda") wrote:
... snip ...
>I have a lambda DNA which I have tagged with biotin. Now I want to measure the 
>amount of biotin that has bound to the lambda DNA. I thought about using streptavidin
>conjugated with alkaline phosphatase and p-nitrophenyl phosphate and measure it
>spectrophotometrically, but then I have problems with the DNA which has to be 
>immobilized first. Any suggestions?

Dear Jowita,

if you have the resources use radioactively labeled avidin /
streptavidin. Immobilize your DNA on a membrane, block it and toss the
radioactivity onto it. Wash, count and voila! Enzymatic tests require
a certain calibration. You can do it but it's more work.

My 2 cents,

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