Page 9 of 33 · 788 questions tagged purity.
The specifics, since they change the answer: +4 · 3751.0 Da. I would rather understand the derivation than memorise the outcome. Two people I asked gave two answers…
The case in front of me: 95.2% · VendorInvestigate · 97.9%. I have two candidate explanations and no way to distinguish them. The same procedure has worked without…
Setup, so nobody has to ask: 95.2% · Medutest · 96.8% · Janoshik. I suspect the honest answer is that it depends, in which case I would like to know on what. Assume I…
I am comparing a supplier certificate against an independent result on the same lot. The empirical answer seems settled. The explanation does not. If the honest…
The particulars: peptide mapping · ecnoglutide. The comparison I want does not seem to exist anywhere in a form I can evaluate. I have read the arguments for each and…
The case in front of me: 99.1% · a C4 column · retatrutide. I would like to know the limits of what can be inferred from this. What I am trying to avoid is…
Details up front: an HPLC purity test · retatrutide. I have used one of these for a while and I am considering switching, which requires a reason. What I care about…
Concretely: an ammonium formate mobile phase · liraglutide · a C8 column. This is one of those things that everyone repeats and nobody derives. This matters…
Numbers first: SWB · retatrutide. This is presented as though it settles something, and I am not convinced it does. I have two documents that appear to disagree,…
The case in front of me: 96.8% · a C4 column · orforglipron. The figures are clear enough; the question is what they mean and what they do not. I can supply the…
Conditions: PeptideMeter · 97.6%. 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…
Details up front: 97.6% · dulaglutide. This should be a straightforward calculation and I keep getting two different answers. The numbers are arbitrary; the method is…
The case in front of me: QST · tirzepatide. The figures are clear enough; the question is what they mean and what they do not. I can supply the numbers if the…
The particulars: liraglutide · 99.1%. I would rather understand the derivation than memorise the outcome. Two people I asked gave two answers that differ by a factor…
What I have: a sterility test · retatrutide. I want to know what the trade-off actually is rather than which option is fashionable. I would rather have a defensible…
Numbers first: racemisation · orforglipron · 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…
I have the report as a PDF with the chromatogram on page two, so I can quote specifics. I would like the mechanism, because I want to be able to reason about the…
The specifics, since they change the answer: peptide mapping · semaglutide. The comparison I want does not seem to exist anywhere in a form I can evaluate. I have…
The specifics, since they change the answer: QYB · semaglutide. I have the document in front of me and I can read the numbers. What I cannot do is interpret them. I…
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…
Conditions: aspartimide formation · liraglutide · minus 80 °C. This is one of those things that everyone repeats and nobody derives. This matters practically, not…
The specifics, since they change the answer: 99.1% · a wide-pore C18 column · mazdutide. I have the document in front of me and I can read the numbers. What I cannot…
For reference: 97.9% · ecnoglutide. I would like the arithmetic checked rather than the conclusion asserted. I have deliberately not used an online calculator because…
Setup, so nobody has to ask: Janoshik · 95.2%. This is not behaving the way I expected and I want to understand the discrepancy before I act on it. I have…