Page 28 of 33 · 788 questions tagged purity.
The method section is present, which is unusual enough that I want to make use of it. I want the working, not the result — I need to be able to redo it with different…
The case in front of me: PeptideMeter · 99.4%. I have two candidate explanations and no way to distinguish them. The same procedure has worked without incident…
Numbers first: 97.6% · orforglipron · GL Biochem. This is a planning question. I know what my options are; I do not know how to weigh them. What I want is the minimum…
For reference: 99.1% · survodutide. I would rather understand the derivation than memorise the outcome. Two people I asked gave two answers that differ by a factor of…
Numbers first: 98.2% · Janoshik · 97.9%. I have a result I cannot explain, and I would rather diagnose it than guess. I have checked the obvious explanations and…
What I am working with: 98.4% · a C18 column · ecnoglutide. I would like help reading this properly rather than being told what conclusion to reach. I have the full…
The case in front of me: 97.1% · VendorInvestigate · 98.4%. I have two candidate explanations and no way to distinguish them. The same procedure has worked without…
Concretely: 98.2% · VendorInvestigate · 99.4% · Janoshik. These are treated as interchangeable and I do not think they are. If both are acceptable I would like to…
Stated plainly: 96.4% · a GLP-1 receptor agonist · HJ. I would like to set this up properly once, rather than adjust it repeatedly. My budget is real but not tight,…
Concretely: ecnoglutide · VendorInvestigate. The figures are clear enough; the question is what they mean and what they do not. I can supply the numbers if the…
What I am working with: 98.8% · a C18 column · ecnoglutide. I would like help reading this properly rather than being told what conclusion to reach. I have the full…
What I am working with: 98.2% · a GLP-1 receptor agonist · QST. I would like to set this up properly once, rather than adjust it repeatedly. My budget is real but not…
What I am working with: QSC · a GLP-1 receptor agonist. I would like help reading this properly rather than being told what conclusion to reach. I have the full…
Conditions: aspartimide formation · liraglutide · room temperature. This is one of those things that everyone repeats and nobody derives. This matters practically,…
Stated plainly: Janoshik · 96.8%. This is not behaving the way I expected and I want to understand the discrepancy before I act on it. I have photographed the current…
Numbers first: 98.4% · Janoshik · 97.1% · PeptideMeter. I want to know what the trade-off actually is rather than which option is fashionable. I would rather have a…
Stated plainly: 98.2% · batch certificate. I have read the primary source rather than the summary, which has left me with more questions. I understand the headline. I…
The case in front of me: a quantified content assay · fibrillation · dulaglutide. These are treated as interchangeable and I do not think they are. If both are…
Setup, so nobody has to ask: 97.9% · sampling plan. I would like help reading this properly rather than being told what conclusion to reach. I have the full report…
Setup, so nobody has to ask: 96.8% · mazdutide · Homopeptide. I am trying to build something sustainable rather than something thorough that I will abandon. I have…
For reference: tirzepatide · a wide-pore C18 column · liraglutide. I am trying to choose between two options that are usually discussed as though only one exists. I…
Details up front: a TFA mobile phase · retatrutide · a C4 column. I suspect the usual explanation for this is wrong, or at least incomplete. I am aware this may have…
Concretely: PeptideMeter · 95.2%. 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: 97.1% · VendorInvestigate · 95.2% · PeptideMeter. I would like the axes of comparison first and the recommendation second. I have tried the…