Peptide storage

Not planning a long cycle, just two or three peptides at most. Everything will stay in the fridge unless larger quantities are purchased later.

That approach covers most situations. Peptides lose potency gradually as they degrade, and colder conditions only slow the process. Dry versions degrade more slowly than ones mixed with water. Over three months the difference between 5 °C and -5 °C storage is unlikely to be noticeable.

That brings to mind a story about peptides left at room temperature in a garage for ten years that still tested with almost no potency loss. The example involved mostly one type but the same pattern might apply more broadly.

Another angle is that unless freezer space is limited there is little reason to calculate exact storage times in advance. Placing all unreconstituted material in the freezer and retrieving it as needed is simpler, and there is no real downside to doing so.

That price sounds like a good find for reliable temperature control. A lab unit might be worth considering if more peptides are added later.

It came from a lab liquidation auction and normally costs quite a bit more.

What about peptides kept in the freezer for two to five years?

No major concern. Some items will probably reach eight or ten years old.

How long do you microwave leftover peptides?

About five minutes for one type and four and a half for the other.

Potency declines continuously though lower temperatures reduce the rate. Only absolute zero would halt degradation entirely. For use within a year refrigeration works fine and the one or two percent difference is not noticeable. Larger molecules benefit more from freezing, especially growth hormone related ones, while certain stabilized compounds with added chains handle fridge conditions better.

Are you adding a desiccant?

Not inside the insulated containers. With more material on hand there may be a switch to vacuum-sealed trays instead. Even then desiccant may not be added. Humidity is not a big worry because the vials are sealed under vacuum, and if that seal fails the vial is probably unusable anyway.