Page 16 of 35 · 833 questions tagged purity.
I am comparing a supplier certificate against an independent result on the same lot. I have worked this out and I would like someone to find the error, because I…
I have the report as a PDF with the chromatogram on page two, so I can quote specifics. I can do the algebra. I am not confident about the conversion factors. If…
The case in front of me: 98.2% · liraglutide · ERP. I want to decide this in advance so that I am not deciding it under pressure later. Assume I will follow the plan…
Conditions: +5 · 4207.2 Da. 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 value…
Setup, so nobody has to ask: cagrilintide · Janoshik. I can parse the result. I am less sure what it licenses me to conclude. I have deliberately not looked at anyone…
The particulars: oral semaglutide · a wide-pore C18 column · mazdutide. I am trying to choose between two options that are usually discussed as though only one…
Details up front: racemisation · a C8 column. I suspect the usual explanation for this is wrong, or at least incomplete. I am aware this may have a boring answer. I…
Stated plainly: 98.2% · mazdutide · QST. I am trying to build something sustainable rather than something thorough that I will abandon. I have already decided the…
The particulars: MKM · ecnoglutide. I have the document in front of me and I can read the numbers. What I cannot do is interpret them. I am reasonably comfortable…
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…
The specifics, since they change the answer: 95.2% · ecnoglutide. I would like the arithmetic checked rather than the conclusion asserted. I have deliberately not…
Conditions: 96.8% · VendorInvestigate · 99.4% · Medutest. I would like the axes of comparison first and the recommendation second. I have tried the first option and…
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…
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…
I have continuous temperature data for the period in question, which is unusual and I would like to use it. I would like the mechanism, because I want to be able to…
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…
Conditions: aspartimide formation · tirzepatide · 37 °C. This is one of those things that everyone repeats and nobody derives. This matters practically, not just…
What I am working with: Janoshik · 99.4%. I noticed this today and I have not touched anything since, in case the state is diagnostic. I have not discarded anything…
Setup, so nobody has to ask: fibrillation · semaglutide · room temperature. I would like the mechanism, because I want to be able to reason about the cases nobody has…
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 case in front of me: GL Biochem · ecnoglutide. I want to understand what this actually establishes, as opposed to what it is being used to imply. My concern is…
Conditions: 97.6% · tirzepatide. Please show the division. I want to check my own against yours. I would like the general form as well as the specific number, so I…
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,…