[Vendor] KP vs BCH on the same compound, same month — both cleared 97.5%
Posting this because the title is the whole finding — KP vs BCH on the same compound, same month — both cleared 97.5% — and a number without its method is a rumour. 97.5% — those are the numbers, and they are the ones I am willing to defend. Started keeping a folder of every certificate I have been sent. The ones…
The document I was worried about turned out to be a re-issue with a later creation date. Asked, got the original, entirely ordinary.
Not quite. Two labs with different gradients can resolve a close-eluting impurity differently and both be reporting honestly.
Spent four months confusing area% and mass% in every post I made here. One explainer thread and it clicked permanently.
identity and quantity are two questions and most documents answer one
HPLC-UV and LC-MS answer different questions
batch number, date of analysis, method, individual impurities — that is the minimum set
the lot on the vial has to match the lot on the page