[Discussion] can we stop arguing about batch until somebody posts a number
Question in the title, detail here: can we stop arguing about batch until somebody posts a number. Area percent is the peak area of your compound over the total integrated area, at one wavelength, on one gradient. It is a relative measure of what the detector saw, not a mass fraction of the vial. UV at 214nm sees the…
Sent one vial to Medutest and PeptideMeter. 99.6% and a claimed 99.0%. Cost me more than the vial and I would do it again.
Sent one vial to Medutest and PeptideMeter.
Agreed, and the practical version is: ask for the itemised table. If it exists, you get it.
Agreed, and the practical version is: ask for the itemised table.
laila_yilmaz has the distinction right — one is a fraction of the detector signal, the other is a fraction of the mass.
Batch number and date of analysis, are both on there?
How to ask for a batch record without it turning into a negotiation.
One email, three requests: the batch-specific certificate for lot X, the method line behind it, and the storage condition the stability statement was written against. No preamble, no explanation of why you want it.
What comes back is the signal. A full document with the column and gradient printed on it, inside a day, tells you there is a real quality system behind the operation. That is the test I run before I order from anyone new, and it costs nothing.
I would not read a rounded figure as evasive. Plenty of documents round to one decimal as house style.
Pushing back a little: a missing field is usually presentation, not concealment. Ask for the full document before drawing conclusions.
Pushing back a little: a missing field is usually presentation, not concealment.
This is the sentence to take away. The rest of the thread is footnotes to it.