Page 10 of 20 · 466 questions tagged hplc.
Details up front: 96.8% · orforglipron. This should be a straightforward calculation and I keep getting two different answers. The numbers are arbitrary; the method…
I am about to pay for quantification on a group of vials rather than just purity, having read enough here to understand why. Before I do, I want to know what I am…
The particulars: 97.1% · 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…
The case in front of me: aspartimide formation · 25 °C. I want to know whether this is a real physical effect or an artefact of how it is measured. What prompted the…
I am trying to specify a method to a contract lab rather than accept their default, and I do not know enough to write a sensible specification. The choices I can see…
Concretely: PeptideMeter · 99.1%. I think I have a problem. I am not yet sure whether it is a real problem or a measurement artefact. I want to know whether this is…
The case in front of me: oxidation · minus 80 °C. This is one of those things that everyone repeats and nobody derives. This matters practically, not just…
What I have: racemisation · 37 °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 still…
I am comparing a supplier certificate against an independent result on the same lot. I have read the primary source rather than the summary, which has left me with…
For reference: VendorInvestigate · 96.8%. An unexpected observation, and I would like a differential rather than reassurance. The conditions were within what I…
Numbers first: hydrolysis · retatrutide · minus 80 °C. I can predict the outcome but I cannot explain it, which means I will get the next case wrong. I would like to…
What I have: 97.9% · 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…
Conditions: 96.4% · method section. The figures are clear enough; the question is what they mean and what they do not. I can supply the numbers if the specifics…
The particulars: oral semaglutide · a wide-pore C18 column · semaglutide. The comparison I want does not seem to exist anywhere in a form I can evaluate. I have read…
Stated plainly: 97.6% · batch certificate. I have read the primary source rather than the summary, which has left me with more questions. I understand the headline. I…
Details up front: 96.4% · 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…
For reference: 96.4% · 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…
For reference: 97.6% · a wide-pore C18 column · mazdutide. I want to understand what this actually establishes, as opposed to what it is being used to imply. My…
Concretely: survodutide · VendorInvestigate. The figures are clear enough; the question is what they mean and what they do not. I can supply the numbers if the…
The case in front of me: 96.4% · oral semaglutide. Please show the division. I want to check my own against yours. I would like the general form as well as the…
What I am working with: aggregation · a GLP-1 receptor agonist · 40 °C. I keep seeing this stated as a fact with no explanation attached, and unexplained facts make…
Details up front: hydrolysis · a C8 column. 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…
What I am working with: Janoshik · 96.4%. I noticed this today and I have not touched anything since, in case the state is diagnostic. I have not discarded anything…
Concretely: aspartimide formation · tirzepatide · 2–8 °C. I want to know whether this is a real physical effect or an artefact of how it is measured. What prompted…