Mark Haynes Mark.Haynes at Mail.TJU.Edu
Thu Mar 15 18:16:02 EST 2001

ian isn't there a need to block the beads
with something that won't interfere withthe

"Ian A. York" wrote:

> In article <20010315191005.12388.qmail at>,
> Manjili  <mmanjili at> wrote:
> >
> >buffer or PBS. I incubate antibody-antigen at 4 degree for 2 h and then add
> >protein A sepharose to the mixture followed by incubation at 4 degree
> >overnight while rotating.
> Overnight is way longer than necessary, and can definitely cause
> non-specific binding.  Try adding antibody for 1 hour on ice, and then
> protein A-sepharose for 90 minutes while rotating.
> Also consider the possibility that it's not actually binding, but proteins
> coming out of solution (or not being cleared properly): if the protein
> precipitates, then it'll come along with your protein A-sepharose pellet.
> Spin the lysate aggressively before adding antibody.  Or, if you don't
> mind spending a bit of money, try Spin-X microfuge tubes or something
> similar: a .45 micron filter clears the lysate out very nicely.
> Ian
> --
>     Ian York   (iayork at  <>
>     "-but as he was a York, I am rather inclined to suppose him a
>      very respectable Man." -Jane Austen, The History of England

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