Page 4 of 33 · 771 questions tagged coa.
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…
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.…
Conditions: 98.8% · a C4 column · dulaglutide. I would like to know the limits of what can be inferred from this. What I am trying to avoid is over-reading a single…
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…
Stated plainly: 98.8% · Medutest · 98.4%. I noticed this today and I have not touched anything since, in case the state is diagnostic. I have not discarded anything…
I sent two vials from two different batches, both labelled 10 mg semaglutide, for independent testing and asked for purity and quantification on each. The results…
The particulars: oral semaglutide · ten weeks · minus 20 °C. I would like to define my thresholds before I have a result, for obvious reasons. I want a plan with…
Stated plainly: QST · Zhuhai Kerui Biotechnology. These are treated as interchangeable and I do not think they are. If both are acceptable I would like to know that,…
Details up front: mazdutide · six weeks · 30 °C. This is a planning question. I know what my options are; I do not know how to weigh them. What I want is the minimum…
What I have: FGP · Nantong Guangyuan Chemical. Both of these get recommended confidently by different people, which suggests neither is obviously right. My…
Conditions: WWB · WuXi TIDES. I want to know what the trade-off actually is rather than which option is fashionable. I would rather have a defensible reason than a…
I have certificates from two lots and an independent result on one of them. I can find plenty of assertions about this and almost no reasoning, which is usually a…
Conditions: 97.6% · date of analysis. I would like to know the limits of what can be inferred from this. What I am trying to avoid is over-reading a single result,…
For reference: oral semaglutide · three weeks · 40 °C. I am at the decision point and I would rather think it through than improvise. I would rather spend money on…
Conditions: 97.1% · VendorInvestigate · 95.2%. I think I have a problem. I am not yet sure whether it is a real problem or a measurement artefact. I want to know…
Conditions: ecnoglutide · 99.1%. I want the working, not the result — I need to be able to redo it with different numbers. I care about the precision as well as the…
Details up front: QYB · survodutide. Somebody stated this to me confidently and I would like to check it before repeating it. I would accept a well-reasoned negative…
For reference: oral semaglutide · three weeks · 25 °C. I am at the decision point and I would rather think it through than improvise. I would rather spend money on…
For reference: tirzepatide · ten weeks · 30 °C. I would like to define my thresholds before I have a result, for obvious reasons. I want a plan with explicit stopping…
The particulars: 99.1% · chromatogram. I want to understand what this actually establishes, as opposed to what it is being used to imply. My concern is that I am…