Page 24 of 35 · 833 questions tagged purity.
Setup, so nobody has to ask: 98.8% · a C18 column · semaglutide. I have read the primary source rather than the summary, which has left me with more questions. I…
The case in front of me: ecnoglutide · a C4 column · semaglutide. These are treated as interchangeable and I do not think they are. If both are acceptable I would…
What I am working with: 97.6% · Medutest · 98.4%. I noticed this today and I have not touched anything since, in case the state is diagnostic. I have not discarded…
The case in front of me: aspartimide formation · liraglutide · minus 20 °C. This is one of those things that everyone repeats and nobody derives. This matters…
Setup, so nobody has to ask: +3 · 4813.5 Da. The units are where I keep going wrong, so please be explicit about them. I have sanity-checked the order of magnitude…
What I have: 99.4% · orforglipron. This should be a straightforward calculation and I keep getting two different answers. The numbers are arbitrary; the method is…
The specifics, since they change the answer: 97.1% · ecnoglutide · SGN. I would like to define my thresholds before I have a result, for obvious reasons. I want a…
The particulars: tirzepatide · a wide-pore C18 column · semaglutide. I am trying to choose between two options that are usually discussed as though only one exists. I…
Concretely: 97.9% · VendorInvestigate · 96.8%. 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…
Details up front: racemisation · dulaglutide · minus 80 °C. I can predict the outcome but I cannot explain it, which means I will get the next case wrong. I would…
What I am working with: 96.4% · mazdutide · QST. I would like to set this up properly once, rather than adjust it repeatedly. My budget is real but not tight, and my…
For reference: tirzepatide · a wide-pore C18 column · survodutide. I am trying to choose between two options that are usually discussed as though only one exists. I…
What I am working with: 96.4% · Medutest · 98.4% · PeptideMeter. I suspect the honest answer is that it depends, in which case I would like to know on what. Assume I…
The lot number on the vial matches the certificate, which at least rules out the easy problem. The units are where I keep going wrong, so please be explicit about…
The particulars: 98.4% · a wide-pore C18 column · cagrilintide. I have the document in front of me and I can read the numbers. What I cannot do is interpret them. I…
The particulars: 96.8% · a wide-pore C18 column · cagrilintide. I have the document in front of me and I can read the numbers. What I cannot do is interpret them. I…
The specifics, since they change the answer: 96.8% · semaglutide · JEEP. I would like to define my thresholds before I have a result, for obvious reasons. I want a…
The particulars: VendorInvestigate · 98.4%. An unexpected observation, and I would like a differential rather than reassurance. The conditions were within what I…
The particulars: 97.6% · survodutide. I would like the arithmetic checked rather than the conclusion asserted. I have deliberately not used an online calculator…
I have both a purity figure and a content figure, which is why the discrepancy is visible. I can predict the outcome but I cannot explain it, which means I will get…
The specifics, since they change the answer: VendorInvestigate · 99.4%. An unexpected observation, and I would like a differential rather than reassurance. The…
This is my second independent submission on material from the same supplier. I can parse the result. I am less sure what it licenses me to conclude. I have…
What I have: hydrolysis · retatrutide · 2–8 °C. I suspect the usual explanation for this is wrong, or at least incomplete. I am aware this may have a boring answer. I…
Numbers first: 97.9% · dulaglutide · GL Biochem. I would rather over-plan the first cycle and simplify later. I am prepared to do the work if someone can tell me…