Page 2 of 20 · 466 questions tagged hplc.
What I have: Medutest · 96.8%. Before I write this off, I want to check whether it is a known failure mode. I have the lot number, the certificate and the date, and I…
For reference: 98.4% · ecnoglutide. I would like the arithmetic checked rather than the conclusion asserted. I have deliberately not used an online calculator because…
For reference: 98.2% · a wide-pore C18 column · a GLP-1 receptor agonist. I want to understand what this actually establishes, as opposed to what it is being used to…
Numbers first: 99.1% · purity figure. I can parse the result. I am less sure what it licenses me to conclude. I have deliberately not looked at anyone else’s…
Concretely: semaglutide · a C4 column · mazdutide. I would like the axes of comparison first and the recommendation second. I have tried the first option and it…
Conditions: 99.1% · a C4 column · dulaglutide. 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…
Conditions: oxidation · liraglutide · 30 °C. This is one of those things that everyone repeats and nobody derives. This matters practically, not just academically,…
The specifics, since they change the answer: fibrillation · a wide-pore C18 column. I understand the observation; what I do not understand is the mechanism behind it.…
What I am working with: 96.4% · a C18 column · semaglutide. I have read the primary source rather than the summary, which has left me with more questions. I…
Numbers first: 98.8% · purity figure. 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 am working with: dimerisation · minus 80 °C. The empirical answer seems settled. The explanation does not. If the honest answer is that nobody knows, I would…
Conditions: aspartimide formation · liraglutide · 30 °C. I want to know whether this is a real physical effect or an artefact of how it is measured. What prompted the…
What I am working with: retatrutide · a C18 column · retatrutide. Both of these get recommended confidently by different people, which suggests neither is obviously…
What I have: 97.1% · 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…
The particulars: fibrillation · minus 80 °C. I understand the observation; what I do not understand is the mechanism behind it. I have read the two review articles…
Details up front: hydrolysis · minus 20 °C. I can predict the outcome but I cannot explain it, which means I will get the next case wrong. I would like to know how…
The specifics, since they change the answer: 98.4% · chromatogram. I want to understand what this actually establishes, as opposed to what it is being used to imply.…
The particulars: 98.8% · a wide-pore C18 column · a GLP-1 receptor agonist. I want to understand what this actually establishes, as opposed to what it is being used…
I split one vial and sent halves to two independent laboratories. Purity came back 98.1% and 99.4%. Both sent chromatograms. Both look competent. The 1.3-point gap is…
Setup, so nobody has to ask: Janoshik · 97.6%. I noticed this today and I have not touched anything since, in case the state is diagnostic. I have not discarded…
Setup, so nobody has to ask: aggregation · cagrilintide · 25 °C. I keep seeing this stated as a fact with no explanation attached, and unexplained facts make me…
The case in front of me: survodutide · 97.9%. Please show the division. I want to check my own against yours. I would like the general form as well as the specific…
Setup, so nobody has to ask: Janoshik · 99.1%. I noticed this today and I have not touched anything since, in case the state is diagnostic. I have not discarded…
The particulars: VendorInvestigate · 97.6%. An unexpected observation, and I would like a differential rather than reassurance. The conditions were within what I…