Storage Basics: Temperature, Light and Shelf Life
Lyophilized and reconstituted material have very different storage needs. A few general principles explain why suppliers give different guidance for each.
Lyophilized (freeze-dried) vs. reconstituted
Freeze-dried material in a sealed vial is generally the most stable form, since there is no liquid for degradation reactions to occur in. Once a diluent is added, the material behaves very differently and typically needs colder storage and a shorter usable window.
This is a general pattern, not a substitute for the specific storage instructions on your supplier’s COA or product page; those should always take priority for a given batch.
The three usual suspects for degradation
Heat accelerates most degradation reactions, which is why cold-chain shipping and refrigerated or frozen storage are common recommendations.
Light, particularly UV, can break down some compounds over time, a reason many vials ship in amber packaging or a light-blocking outer box.
Repeated freeze-thaw cycles and agitation can also stress reconstituted solutions, which is part of why single-use aliquots are commonly recommended over drawing repeatedly from one vial.
What to actually check
Look for a stated shelf life both before and after reconstitution, a storage temperature range, and whether the supplier recommends protecting the vial from light. If any of these are missing, it is a reasonable question to ask before you buy.
Research use only. This guide is general information, not medical, legal or laboratory-protocol advice. See the full disclaimer for the terms this site operates under.
