Page 5 of 20 · 466 questions tagged hplc.
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…
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…
For reference: 97.9% · 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…
What I am working with: 95.2% · sampling plan. I would like help reading this properly rather than being told what conclusion to reach. I have the full report…
For reference: 97.1% · survodutide. I would rather understand the derivation than memorise the outcome. Two people I asked gave two answers that differ by a factor of…
I have the report as a PDF with the chromatogram on page two, so I can quote specifics. I can do the algebra. I am not confident about the conversion factors. If…
Stated plainly: 95.2% · a C18 column · semaglutide. I have read the primary source rather than the summary, which has left me with more questions. I understand the…
What I have: 98.8% · retatrutide. 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…
Stated plainly: 99.1% · sampling plan. I would like help reading this properly rather than being told what conclusion to reach. I have the full report including the…
A vendor sent me a report showing a clean deconvolved mass at 4113.6 for semaglutide with, in their words, "no impurity peaks detected". Their sales copy turns that…
Numbers first: 95.2% · retatrutide. This should be a straightforward calculation and I keep getting two different answers. The numbers are arbitrary; the method is…
Setup, so nobody has to ask: orforglipron · a C18 column · retatrutide. I suspect the honest answer is that it depends, in which case I would like to know on what.…
The particulars: 96.4% · 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…
Details up front: 95.2% · lot-specific certificate. This is presented as though it settles something, and I am not convinced it does. I have two documents that appear…