[Discussion] lyophilised is doing more work than we give it credit for
lyophilised is doing more work than we give it credit for. Not a hot take, just something I have not seen said plainly here. Put a logger in three consecutive orders. Two never went above the range at all and the third spent four hours warm on a Friday. Cost me almost nothing to stop wondering. A transit temperature…
insulation buys hours, not days
Small fix — refrigerated, not frozen, once it is in solution.
Asked QST which lines they hold regionally and got a straight list back. That answered my summer ordering question completely.
Once in solution, the relevant risks are hydrolysis, aggregation and, for some sequences, oxidation. Refrigeration slows all three; freezing a solution introduces a separate risk at the ice interface.
Lyophilisation removes the water that drives most degradation pathways. That is why the dry cake is comparatively robust and the reconstituted solution is not.
Yes — a logger in the box turns a fortnight of speculation into a chart.
ask what storage condition the stability statement was written against
Gel packs are designed for a duty cycle. A liquid pack at the end of a longer-than-expected transit is a pack behaving as specified, not evidence of an excursion in the vial.
fridge, not freezer, once it is in solution
powder at room temperature for a few days is usually a non-event
Which lane, and had it been quoted at that transit time?
Do you know what storage condition the stability statement covers?
a logger costs less than a vial and answers the question permanently
Yes — reconstitution date on the vial. It is the number you will want and cannot reconstruct.