De-freezing FBS... - (May/09/2012 )

I'm sorry, if its a dumb question. I have purchased around 500mL of FBS as a stock. I will be using that to make my stromal medium. But I'm not sure how to get my FBS. Shall I de-freeze the whole container, take 50mL and freeze 'em again? Would that alter its properties. Previously I was using 50mL frozen FBS, just warm them up once and continue using them.

What does heat-inactivated means?

Thanks

There is no such thing as a dumb question (well I suppose there is, but this isn't one). You can't learn if you don't ask

Yes, thaw the whole bottle, then aliquot the whole bottle out into 50ml volumes and refreeze. A single freeze thaw will not be a problem. (don't just refreeze the 450ml remaining in the original bottle though, coz this will lead to repeated freeze thaws).

Heat-inactivation: see this interesting article/flyer
https://fscimage.fishersci.com/cmsassets/downloads/segment/Scientific/pdf/Cell_Culture/Application_Notes/heat_inactivation.pdf

So, I should take care I don;t freeze-thaw repeatedly? I aliquot all of the FBS into 50mL tubes, and re-freeze them, I can take one, warm it up and use any time. Did I get this right? Actually this makes sense since I was using an old student's stock previously and all were frozen in 50mL centri-tubes. Thanks for the flyer

cshmech on Wed May 9 06:00:11 2012 said:

So, I should take care I don;t freeze-thaw repeatedly? I aliquot all of the FBS into 50mL tubes, and re-freeze them, I can take one, warm it up and use any time. Did I get this right? Actually this makes sense since I was using an old student's stock previously and all were frozen in 50mL centri-tubes. Thanks for the flyer