Seum IgM stability

Bryan bkiehl1 at san.rr.com
Sat Feb 14 21:32:42 EST 1998

As you know, stability can be a problem. The problem is usually most
associated with freeze and thaws.

All serum or other protein type materials (e.g., conjugated antibodies) are
very susceptible to microbial contamination. If your system can tolerate use
of a preservative such as sodium azide, you might make a 100x concentrate
and add a little to each tube. Obviously aseptic handling is also very

GenBio, San Diego
Bryan at GenBio.com

ptaylor at medicina.ivic.ve wrote in message
<6bpu2e$v$1 at orthanc.reference.com>...
>I'm trying to solve the problem of IgM instability in serum
> samples. We bring in serum samples from the field often
> without ice, never mind frozen, and I'm worried about loss of
>specific IgM activity when the samples are put into an ELISA.
>I understand that IgM is also lost on prolonged storage at 4oC.
>Is the problem principally aggregation? In that case does
> diluting the serum help?
>Is the problem proteases? Then add anti-proteases?
>J chain instability?
>Basically, what is ingredient X that I can add to serum samples
> to preserve IgM?
>Peter Taylor
>Centro de Medicina Experimental
>Instituto Venezolano de Investigaciones Cientificas
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