Page 5 of 21 · 503 questions tagged hplc.
What I have: a GLP-1 receptor agonist · a C8 column · retatrutide. I want to know what the trade-off actually is rather than which option is fashionable. I would…
Conditions: semaglutide · 97.1%. 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…
Stated plainly: 96.4% · a C18 column · ecnoglutide. I have read the primary source rather than the summary, which has left me with more questions. I understand the…
Stated plainly: 97.1% · cagrilintide. The units are where I keep going wrong, so please be explicit about them. I have sanity-checked the order of magnitude and it…
Details up front: racemisation · retatrutide · 4 °C. I suspect the usual explanation for this is wrong, or at least incomplete. I am aware this may have a boring…
Numbers first: 99.1% · orforglipron. I can do the algebra. I am not confident about the conversion factors. If there is a standard way to lay this out, I would rather…
The case in front of me: 99.1% · tirzepatide. I want the working, not the result — I need to be able to redo it with different numbers. I care about the precision as…
The particulars: 98.8% · semaglutide. I would like the arithmetic checked rather than the conclusion asserted. I have deliberately not used an online calculator…
Concretely: oxidation · 4 °C. This is one of those things that everyone repeats and nobody derives. This matters practically, not just academically, because it…
For reference: fibrillation · 37 °C. I understand the observation; what I do not understand is the mechanism behind it. I have read the two review articles that come…
Numbers first: 99.4% · a C8 column · liraglutide. This is presented as though it settles something, and I am not convinced it does. I have two documents that appear…
Numbers first: 98.8% · 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…
Conditions: 96.8% · 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,…
The case in front of me: oxidation · 30 °C. This is one of those things that everyone repeats and nobody derives. This matters practically, not just academically,…
The case in front of me: ecnoglutide · a C4 column · survodutide. I would like the axes of comparison first and the recommendation second. I have tried the first…
Details up front: racemisation · 4 °C. I suspect the usual explanation for this is wrong, or at least incomplete. I am aware this may have a boring answer. I would…
What I have: racemisation · orforglipron · 2–8 °C. I suspect the usual explanation for this is wrong, or at least incomplete. I am aware this may have a boring…
Numbers first: 95.2% · 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…
The particulars: 97.1% · semaglutide. I would like the arithmetic checked rather than the conclusion asserted. I have deliberately not used an online calculator…
Conditions: 97.9% · liraglutide. 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…
I have the report as a PDF with the chromatogram on page two, so I can quote specifics. I understand the observation; what I do not understand is the mechanism behind…
Concretely: aspartimide formation · a C4 column. I want to know whether this is a real physical effect or an artefact of how it is measured. What prompted the…
The specifics, since they change the answer: deamidation · 4 °C. I would like the mechanism, because I want to be able to reason about the cases nobody has written…
Numbers first: 96.8% · a C8 column · oral semaglutide. I can parse the result. I am less sure what it licenses me to conclude. I have deliberately not looked at…