Page 4 of 38 · 910 questions tagged batch-testing.
I have both a purity figure and a content figure, which is why the discrepancy is visible. I am at the decision point and I would rather think it through than…
The case in front of me: an HPLC purity test · orforglipron. I would rather over-plan the first cycle and simplify later. I am prepared to do the work if someone can…
The specifics, since they change the answer: 98.8% · PeptideMeter · 97.9%. An unexpected observation, and I would like a differential rather than reassurance. The…
I have both a purity figure and a content figure, which is why the discrepancy is visible. I have the document in front of me and I can read the numbers. What I…
The particulars: 99.4% · PeptideMeter · 97.1%. Something has gone wrong and I would like to know how badly before I decide what to do. Nothing else in the setup…
I am comparing a supplier certificate against an independent result on the same lot. I have read the primary source rather than the summary, which has left me with…
The method section is present, which is unusual enough that I want to make use of it. This is a procedural question rather than a theoretical one, and I would like…
I split one vial and sent halves to two independent laboratories. Purity came back 98.1% and 99.4%. Both sent chromatograms. Both look competent. The 1.3-point gap is…
For reference: chromatogram · GL Biochem. The failure mode I am trying to avoid is making this decision emotionally. I have twelve months in view and I would like the…
Details up front: QSC · Xi’an Mokemei Biotechnology. Both of these get recommended confidently by different people, which suggests neither is obviously right. My…
Setup, so nobody has to ask: Janoshik · 97.6%. I noticed this today and I have not touched anything since, in case the state is diagnostic. I have not discarded…
I have both a purity figure and a content figure, which is why the discrepancy is visible. I would like to understand the steps well enough to explain them to someone…
Setup, so nobody has to ask: 97.9% · Medutest · 98.8% · Janoshik. Both of these get recommended confidently by different people, which suggests neither is obviously…
The case in front of me: HJ · Zhuhai Kerui Biotechnology. These are treated as interchangeable and I do not think they are. If both are acceptable I would like to…
Details up front: BCH · identity confirmation by mass spectrometry. I have worked this out and I would like someone to find the error, because I suspect there is one.…
The case in front of me: lot-specific certificate · WWB. I have read the primary source rather than the summary, which has left me with more questions. I understand…
Setup, so nobody has to ask: a Karl Fischer water content test · a two-person split. The failure mode I am trying to avoid is making this decision emotionally. I have…
The method section is present, which is unusual enough that I want to make use of it. This has the shape of a fact but I cannot find its origin. What I found instead…
Setup, so nobody has to ask: Janoshik · 99.1%. I noticed this today and I have not touched anything since, in case the state is diagnostic. I have not discarded…
The particulars: VendorInvestigate · 97.6%. An unexpected observation, and I would like a differential rather than reassurance. The conditions were within what I…
What I am working with: TFC · an HPLC purity test. I want the working, not the result — I need to be able to redo it with different numbers. I care about the…
Details up front: QSC · identity confirmation by mass spectrometry. I have worked this out and I would like someone to find the error, because I suspect there is one.…
For reference: an endotoxin test · cagrilintide. I would like to set this up properly once, rather than adjust it repeatedly. My budget is real but not tight, and my…
What I am working with: 98.4% · Medutest · 96.8%. I noticed this today and I have not touched anything since, in case the state is diagnostic. I have not discarded…