Page 17 of 35 · 833 questions tagged purity.
What I am working with: Janoshik · 98.8%. I noticed this today and I have not touched anything since, in case the state is diagnostic. I have not discarded anything…
The lot number on the vial matches the certificate, which at least rules out the easy problem. The figures are clear enough; the question is what they mean and what…
What I am working with: 96.4% · cagrilintide · CPC. I am trying to build something sustainable rather than something thorough that I will abandon. I have already…
What I have: 95.2% · Janoshik · 99.4%. I have a result I cannot explain, and I would rather diagnose it than guess. I have checked the obvious explanations and…
Conditions: oxidation · liraglutide · 30 °C. I want to know whether this is a real physical effect or an artefact of how it is measured. What prompted the question is…
What I am working with: +3 · 4113.6 Da. I have worked this out and I would like someone to find the error, because I suspect there is one. My working so far, for the…
Details up front: 96.8% · orforglipron. This should be a straightforward calculation and I keep getting two different answers. The numbers are arbitrary; the method…
What I have: 97.1% · Janoshik · 98.4%. Before I write this off, I want to check whether it is a known failure mode. I have the lot number, the certificate and the…
The particulars: 97.1% · 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…
I am trying to specify a method to a contract lab rather than accept their default, and I do not know enough to write a sensible specification. The choices I can see…
Concretely: 98.4% · tirzepatide · BCH. The failure mode I am trying to avoid is making this decision emotionally. I have twelve months in view and I would like the…
Concretely: a quantified content assay · tirzepatide. I would like the axes of comparison first and the recommendation second. I have tried the first option and it…
Concretely: PeptideMeter · 99.1%. 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: 98.4% · VendorInvestigate · 97.6% · PeptideMeter. I would like the axes of comparison first and the recommendation second. I have tried the…
Concretely: GL Biochem · survodutide. 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…
For reference: VendorInvestigate · 96.8%. An unexpected observation, and I would like a differential rather than reassurance. The conditions were within what I…
Details up front: +2 · 4113.6 Da. 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…
The case in front of me: a residual-solvent screen · hydrolysis · ecnoglutide. Both of these get recommended confidently by different people, which suggests neither…
Stated plainly: racemisation · retatrutide · room temperature. I can predict the outcome but I cannot explain it, which means I will get the next case wrong. I would…
Stated plainly: ERP · a GLP-1 receptor agonist. I have read the primary source rather than the summary, which has left me with more questions. I understand the…
Stated plainly: 96.8% · Medutest · 97.6%. I noticed this today and I have not touched anything since, in case the state is diagnostic. I have not discarded anything…
Concretely: 98.2% · VendorInvestigate · 99.4% · Medutest. These are treated as interchangeable and I do not think they are. If both are acceptable I would like to…
Numbers first: 97.1% · Janoshik · 96.8%. Before I write this off, I want to check whether it is a known failure mode. I have the lot number, the certificate and the…
Conditions: 96.4% · method section. The figures are clear enough; the question is what they mean and what they do not. I can supply the numbers if the specifics…