Page 10 of 35 · 833 questions tagged purity.
For reference: racemisation · dulaglutide · room temperature. I can predict the outcome but I cannot explain it, which means I will get the next case wrong. I would…
The particulars: 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 is…
Concretely: an ammonium formate mobile phase · liraglutide · a C8 column. This is one of those things that everyone repeats and nobody derives. This matters…
Conditions: 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, which…
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…
Concretely: 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 specifics change 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…
The specifics, since they change the answer: a sterility test · retatrutide. I want to know what the trade-off actually is rather than which option is fashionable. I…
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…
Conditions: peptide mapping · semaglutide. The comparison I want does not seem to exist anywhere in a form I can evaluate. I have read the arguments for each and they…
What I am working with: QYB · semaglutide. I have the document in front of me and I can read the numbers. What I cannot do is interpret them. I am reasonably…
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…
Numbers first: a GLP-1 receptor agonist · 96.4%. This should be a straightforward calculation and I keep getting two different answers. The numbers are arbitrary; the…
The particulars: 95.2% · a wide-pore C18 column · mazdutide. 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: mazdutide · a C8 column · survodutide. I have used one of these for a while and I am considering switching, which requires a reason. What I care…
Setup, so nobody has to ask: an HPLC purity test · orforglipron. I have used one of these for a while and I am considering switching, which requires a reason. What I…
Details up front: 99.1% · orforglipron · QYB. I would rather over-plan the first cycle and simplify later. I am prepared to do the work if someone can tell me which…
The case in front of me: 95.2% · a C4 column · retatrutide. The figures are clear enough; the question is what they mean and what they do not. I can supply the…
What I have: cagrilintide · 95.2%. 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…