Page 9 of 20 · 466 questions tagged hplc.
The case in front of me: oxidation · tirzepatide · 25 °C. This is one of those things that everyone repeats and nobody derives. This matters practically, not just…
What I have: 96.4% · a C8 column · tirzepatide. This is presented as though it settles something, and I am not convinced it does. I have two documents that appear to…
For reference: 97.1% · ecnoglutide. I would rather understand the derivation than memorise the outcome. Two people I asked gave two answers that differ by a factor of…
Numbers first: 97.6% · lot-specific certificate. This is presented as though it settles something, and I am not convinced it does. I have two documents that appear to…
What I have: mazdutide · a C8 column · mazdutide. I want to know what the trade-off actually is rather than which option is fashionable. I would rather have a…
The method section is present, which is unusual enough that I want to make use of it. These are treated as interchangeable and I do not think they are. If both are…
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…
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…
I am comparing a supplier certificate against an independent result on the same lot. The empirical answer seems settled. The explanation does not. If the honest…
Details up front: racemisation · dulaglutide · minus 20 °C. I suspect the usual explanation for this is wrong, or at least incomplete. I am aware this may have a…
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…
Concretely: oxidation · 2–8 °C. This is one of those things that everyone repeats and nobody derives. This matters practically, not just academically, because it…
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…
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…
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…
Concretely: oxidation · liraglutide · 25 °C. This is one of those things that everyone repeats and nobody derives. This matters practically, not just academically,…
Concretely: aspartimide formation · tirzepatide · 4 °C. I want to know whether this is a real physical effect or an artefact of how it is measured. What prompted the…
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,…
What I am working with: Janoshik · 98.8%. 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: dimerisation · mazdutide · 37 °C. The empirical answer seems settled. The explanation does not. If the honest answer is that nobody…
Details up front: hydrolysis · orforglipron · 40 °C. I can predict the outcome but I cannot explain it, which means I will get the next case wrong. I would like to…