I have continuous temperature data for the period in question, which is unusual and I would like to use it.
I am at the decision point and I would rather think it through than improvise.
I would rather spend money on measurement than on redundancy.
How do I make this decision on evidence rather than on feel?
Keep the paperwork with the material, or the material becomes anonymous.
Label the vial at reconstitution with the date, the concentration and the resulting units per dose. This is the single most useful thirty seconds in the whole process.
Position matters less than people think: upright or on its side makes no difference to a lyophilised powder, and upright is marginally better for a reconstituted vial because it keeps the stopper dry.
The 28-day in-use period for preservative-containing multi-dose preparations is printed on the diluent labelling and is a long-standing pharmacy convention.
Dry, cold, dark, still. Four words and you have the answer.
edited 10 Aug 2024 by coldpack_88 — removed a claim I could not source
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Browse resultsThe honest answer is that ordinary refrigeration handles almost every case people ask about.
Lyophilised powder: refrigerated at two to eight degrees for months, frozen at minus twenty for longer. The gain from minus eighty over minus twenty is small for a dry solid and is not usually worth the arrangement.
Concretely, let a refrigerated or frozen vial equilibrate to room temperature before opening, so humid air does not condense water onto a cold cake.
Photodegradation of tryptophan-containing peptides is documented and is the basis for light-protected storage recommendations.
Label the vial at reconstitution with date, concentration and units per dose.
The short version: powder in the freezer or fridge, reconstituted in the fridge for weeks, and never anything on a windowsill.
Keep the certificate with the vial, physically or as a photograph filed under the lot code. A vial without a traceable certificate is an anonymous vial regardless of where it came from.
Reconstituted with a preservative-containing diluent: refrigerated, conventionally treated as usable for about 28 days from first entry. Without a preservative, single use and discard.
The caveat is that storage conditions preserve what you have and cannot improve it.
Equilibrate before opening or you condense water into the cake.
Start with the physical state, because lyophilised and reconstituted material have completely different storage answers.
Keep vials in their original carton or in an opaque box. Light exposure matters for tryptophan-containing sequences and for anything with a chromophore, and a closed box is free.
Two-to-eight-degree refrigeration and minus-twenty freezing are the standard storage conditions for lyophilised peptides in supplier documentation across the market.
Minus eighty buys very little over minus twenty for a dry solid.
edited 10 Aug 2024 by v_ramaswamy — expanded the table to cover the lower concentration
Answering this needs the intended duration, since a fortnight and two years call for different arrangements.
Store with the desiccant sachet if one was supplied, inside the secondary container rather than loose in a drawer. Residual moisture is the dominant variable in solid-state stability.
Residual moisture is the dominant determinant of solid-state stability, which is why desiccants accompany lyophilised material.
Keep the desiccant with the vial and the certificate with the lot code.
Ask PeptideStack is a static archive. Posting is closed, but the norms are worth stating: answer the question that was asked, show your working, cite the trial or the certificate, and say plainly where the evidence runs out.