Page 13 of 20 · 466 questions tagged hplc.
Details up front: a GLP-1 receptor agonist · a C8 column · semaglutide. I have used one of these for a while and I am considering switching, which requires a reason.…
The specifics, since they change the answer: fibrillation · 2–8 °C. I understand the observation; what I do not understand is the mechanism behind it. I have read the…
What I am working with: 98.2% · sampling plan. I would like help reading this properly rather than being told what conclusion to reach. I have the full report…
Setup, so nobody has to ask: orforglipron · a C18 column · survodutide. Both of these get recommended confidently by different people, which suggests neither is…
Setup, so nobody has to ask: aggregation · a GLP-1 receptor agonist · room temperature. I keep seeing this stated as a fact with no explanation attached, and…
What I am working with: 98.4% · 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: dimerisation · a GLP-1 receptor agonist · 40 °C. The empirical answer seems settled. The explanation does not. If the honest answer is that…
The particulars: 96.4% · ecnoglutide. I would like the arithmetic checked rather than the conclusion asserted. I have deliberately not used an online calculator…
The case in front of me: PeptideMeter · 98.2%. I have two candidate explanations and no way to distinguish them. The same procedure has worked without incident…
The specifics, since they change the answer: deamidation · room temperature. I would like the mechanism, because I want to be able to reason about the cases nobody…
What I am working with: dulaglutide · a C18 column · survodutide. Both of these get recommended confidently by different people, which suggests neither is obviously…
For reference: deamidation · survodutide · room temperature. I would like the mechanism, because I want to be able to reason about the cases nobody has written about.…
The specifics, since they change the answer: 99.4% · list of related substances. I have the document in front of me and I can read the numbers. What I cannot do is…
Stated plainly: retatrutide · 98.2%. I have worked this out and I would like someone to find the error, because I suspect there is one. My working so far, for the…
Setup, so nobody has to ask: 98.4% · sampling plan. I would like help reading this properly rather than being told what conclusion to reach. I have the full report…
The specifics, since they change the answer: deamidation · ecnoglutide · 37 °C. I would like the mechanism, because I want to be able to reason about the cases nobody…
The specifics, since they change the answer: 95.2% · list of related substances. I have the document in front of me and I can read the numbers. What I cannot do is…
Setup, so nobody has to ask: retatrutide · a C18 column · liraglutide. Both of these get recommended confidently by different people, which suggests neither is…
For reference: 97.1% · 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 being…
Concretely: 98.8% · 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…
Details up front: hydrolysis · retatrutide · 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…
For reference: deamidation · 30 °C. I would like the mechanism, because I want to be able to reason about the cases nobody has written about. I have tried to reason…
Numbers first: 99.1% · 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…
Details up front: racemisation · retatrutide · 30 °C. I suspect the usual explanation for this is wrong, or at least incomplete. I am aware this may have a boring…