lyophilised — 8 things I got wrong before I got it right
lyophilised — 8 things I got wrong before I got it right — a position I have arrived at slowly and would like tested.
On loggers, since I was sceptical and then bought one.
A small transit logger costs a fraction of a vial and records the whole journey rather than the moment of arrival. What I learned from three of them: my lane is far more stable than I assumed, the one excursion I did capture was on a weekend, and the arrival-temperature guessing I had been doing was worthless.
If you are going to argue about cold chain, argue from a chart. It is a one-off purchase and it ends the speculation permanently.
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.
Ask me anything specific. Anything general I will probably get wrong.
best — the order this archive was captured in
You cannot infer potency from a temperature record. The record tells you what happened to the box; only a test tells you what happened to the material.
Wrote the reconstitution date on the vial for the first time last year. Have never once since wondered how old a solution is.
Same. Door shelf is the worst place in the fridge and it is where everybody puts them.
lyophilised powder is far more forgiving than the panic threads suggest
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.
Merged into the seasonal thread for that lane so the reports sit together.
Gel pack fully liquid on arrival, powder tested 98.7% against a claimed 98.5% afterwards. The pack had done its job for as long as it was designed to.
This. A liquid gel pack on arrival tells you about the pack’s duty cycle, not about the vial.
Do you know what storage condition the stability statement covers?
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.
Put a logger in three consecutive orders.
This is the distinction that resolves most threads here — powder and solution are different problems.
Ordered from the warehouse in Germany instead of origin and the transit went from a fortnight to 13 days. Entirely different proposition in August.
Cosigning the regional stock point. Ordering from a warehouse in Canada took the whole question off my table.