why does nobody talk about water content
why does nobody talk about water content. Searched first, found three threads that contradict each other, hence the post. Asked for the storage condition behind the stability statement. Got it in a sentence. It is a two-line email and almost nobody sends it. The document I was worried about turned out to be a…
Is water content on the document? It changes your concentration arithmetic.
Sent one vial to Medutest and VendorInvestigate. 98.6% and a claimed 98.5%. Cost me more than the vial and I would do it again.
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Started keeping a folder of every certificate I have been sent. The ones that itemise impurities are a small group and they are mostly the same suppliers.
Ask what the stability statement was written against — temperature, light, and whether it was the lyophilised powder or the reconstituted solution. Those are three different claims.
Related substances itemised individually is a much stronger document than a single total, because it tells you the shape of the impurity profile rather than its size.
Asked WXT for the batch-specific certificate and had the full document — batch, date, method line naming the column — inside six hours. That is now my baseline for everybody.
That is the catalogue certificate rather than the batch-specific one. Same layout, completely different status.
redact your own name, never the batch details