[Histonet] pepsin powder expiration date

[Merced M Leiker]

I'd like to know this one too. I have about a younger supply, a 12-month old
bottle of pepsin powder, and will start doing FISH experiments again with it soon.


Merced M Leiker
Research Technician III
Cardiovascular Medicine, 348 BRB
State University of New York at Buffalo
3435 Main Street, Buffalo, NY 14214
Ph: (716) 829-6118

On Sat 03/19/11  6:33 AM , "Gudrun Lang" gu.lang <@t> gmx.at sent:
> Dear histonetters,
> 
> We have a sigma pepsin powder (7012) in use for our FISH protocol. The
> container has to be stored at -20°C, but has no labelled
> expiration date.
> We have been using the same container for the last 18-20 months. Now we
> havesome troubles with the performance of our FISH-signals.
> 
> 
> 
> My question is for those, you have experience with this kind of product:
> 
> How long can such pepsin powders be used without lost of activity?
> 
> 
> 
> Thanks in advance
> 
> Gudrun Lang
> 
> 
> 
> Histolab, Austria
> 
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