Page 14 of 32 · 749 questions tagged coa.
I have the report as a PDF with the chromatogram on page two, so I can quote specifics. I would like the mechanism, because I want to be able to reason about the…
The specifics, since they change the answer: 98.8% · PeptideMeter · 97.6%. Something has gone wrong and I would like to know how badly before I decide what to do.…
Stated plainly: 97.9% · Medutest · 98.8%. I noticed this today and I have not touched anything since, in case the state is diagnostic. I have not discarded anything…
What I have: KP · orforglipron. I am asking for verification rather than opinion, ideally with something I can read myself. It is possible the evidence exists and I…
For reference: 98.8% · list of related substances. I have the document in front of me and I can read the numbers. What I cannot do is interpret them. I am reasonably…
What I have: cagrilintide · Janoshik. I can parse the result. I am less sure what it licenses me to conclude. I have deliberately not looked at anyone else’s…
What I have: batch certificate · ERP. This is presented as though it settles something, and I am not convinced it does. I have two documents that appear to disagree,…
Every explanation of quantitative HPLC I have read says the result is traceable to the reference standard, and then moves on as though that settles it. I want to open…
The recurring point in this tag is that stereoisomers and sequence isomers are invisible to mass spectrometry. I accept that for intact mass. What I want to know is…
What I am working with: BCH · Shanghai Sigma-Audley. Both of these get recommended confidently by different people, which suggests neither is obviously right. My…
Setup, so nobody has to ask: 98.2% · Medutest · 99.1%. This is not behaving the way I expected and I want to understand the discrepancy before I act on it. I have…
The method section is present, which is unusual enough that I want to make use of it. I am trying to do this correctly the first time rather than learn it by getting…
Conditions: 99.4% · a C4 column · orforglipron. 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…
The method section is present, which is unusual enough that I want to make use of it. I want to decide this in advance so that I am not deciding it under pressure…
What I have: SGN · Bachem Holding (Suzhou). I have used one of these for a while and I am considering switching, which requires a reason. What I care about is…
What I am working with: 95.2% · batch certificate. I have read the primary source rather than the summary, which has left me with more questions. I understand the…
The method section is present, which is unusual enough that I want to make use of it. I have done this once and I suspect I got away with it rather than got it right.…
The method section is present, which is unusual enough that I want to make use of it. I noticed this today and I have not touched anything since, in case the state is…
The method section is present, which is unusual enough that I want to make use of it. I keep seeing this stated as a fact with no explanation attached, and…
Numbers first: batch certificate · QSC. I would rather over-plan the first cycle and simplify later. I am prepared to do the work if someone can tell me which work…
Conditions: QST · liraglutide. I want to know whether there is evidence behind this or only repetition. I have checked the obvious registries and monographs without…
Setup, so nobody has to ask: retatrutide · eight weeks · 4 °C. I would like to set this up properly once, rather than adjust it repeatedly. My budget is real but not…
I have the report as a PDF with the chromatogram on page two, so I can quote specifics. I have the document in front of me and I can read the numbers. What I cannot…
Concretely: 99.4% · 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,…