[TripDog]

I read not to freeze them but thats what I always did. Is it safer to refrigerate them instead of keeping them in the freezer? Please only answer if you know 100%.

~TriP

[ludacris007]

unmixed u can put in freezer. when mixed NEVER freeze.

[TripDog]

Originally Posted by ludacris007

unmixed u can put in freezer. when mixed NEVER freeze.

Thats what i'm thinking, freezing a non mixed peptide cant damage it.

[ludacris007]

what u planning on running if you dont mind me asking

[TripDog]

Originally Posted by ludacris007

what u planning on running if you dont mind me asking

edited

[Bobaslaw]

Originally Posted by TripDog

I read not to freeze them but thats what I always did. Is it safer to refrigerate them instead of keeping them in the freezer? Please only answer if you know 100%.

~TriP

Much debate on this topic for reconned as well as lypholized powder. Here is some storage info from a couple of peptide manufacturers which shows refridgerator level temps as the recommendation. I do beleive that freezing will not be detrimental if you avoid repeated freeze/thaw cycles. Multi F/T is the real culprit in peptide degradation:


Storage Information for MGF

From Phoenix Peptide as posted bt LakeMountD:

Storage: Before using, store the peptide in the DRY form at 0 - 5 °C. For best and repeatable results, rehydrate the peptide immediately before using. Do not re-freeze any unused portions.

Novozymes GroPep: Biotech Reagents

Per Gropep:

Stability / Storage: Peptides in the lyophilized state should be stored at 2-4° C and are stable for at least 2 years, or 6 months at room temperature¹.

Hope this helps

[pumbertot]

worth noting that Gropep also say you can recon with 10mM HCL then freeze but avoid freeze-thaw cycles.

The peptide should be reconstituted in 10 mM HCl at a concentration of 1 mg/ml. In this form it is stable for at least 3 months at -20° C or -80° C¹. Avoid freeze-thaw cycles.

Im pretty sure its ok to freeze lypholised peptides tbh.

[datBtrue]

I was going to post some info from Therapeutic Peptides and Proteins - Formulation, Processing and Delivery Systems, 2nd ed. but there is a lot to read...

...so here it is in total ...you can read all the sections on storage throughout the book...or read the whole thing and become an expert.

Therapeutic Peptides and Proteins - Formulation, Procg and Deliv Systems.pdf

[TripDog]

Originally Posted by datBtrue

I was going to post some info from Therapeutic Peptides and Proteins - Formulation, Processing and Delivery Systems, 2nd ed. but there is a lot to read...

...so here it is in total ...you can read all the sections on storage throughout the book...or read the whole thing and become an expert.

Attachment 21191

Wow that looks sweet, I cant wait to read that tonight....reps!!