purity

The specifics, since they change the answer: fibrillation · ecnoglutide · minus 20 °C. I would like the mechanism, because I want to be able to reason about the cases…

Concretely: 98.2% · date of analysis. I would like to know the limits of what can be inferred from this. What I am trying to avoid is over-reading a single result,…

Concretely: semaglutide · a C4 column · tirzepatide. These are treated as interchangeable and I do not think they are. If both are acceptable I would like to know…

I have a COA in front of me with all of the following on it, and I cannot work out which of these numbers is the one I care about: Appearance: white lyophilised…

Concretely: 99.4% · VendorInvestigate · 95.2% · Medutest. These are treated as interchangeable and I do not think they are. If both are acceptable I would like to…

The case in front of me: 99.1% · VendorInvestigate · 96.8%. I have two candidate explanations and no way to distinguish them. The same procedure has worked without…

Concretely: 96.4% · oral semaglutide · BCH. I want to decide this in advance so that I am not deciding it under pressure later. Assume I will follow the plan I write…

Setup, so nobody has to ask: retatrutide · a C18 column · survodutide. Both of these get recommended confidently by different people, which suggests neither is…

The specifics, since they change the answer: a quantified content assay · liraglutide. I would like the axes of comparison first and the recommendation second. I have…

I am comparing a supplier certificate against an independent result on the same lot. Please show the division. I want to check my own against yours. I would like the…

I am comparing a supplier certificate against an independent result on the same lot. I have worked this out and I would like someone to find the error, because I…

Setup, so nobody has to ask: 97.6% · a GLP-1 receptor agonist · HJ. I am trying to build something sustainable rather than something thorough that I will abandon. I…

For reference: deamidation · survodutide · 25 °C. I understand the observation; what I do not understand is the mechanism behind it. I have read the two review…

Details up front: hydrolysis · dulaglutide · 4 °C. I suspect the usual explanation for this is wrong, or at least incomplete. I am aware this may have a boring…

Setup, so nobody has to ask: 97.1% · Medutest · 97.9% · Janoshik. I suspect the honest answer is that it depends, in which case I would like to know on what. Assume I…

What I am working with: 98.2% · Medutest · 96.4%. This is not behaving the way I expected and I want to understand the discrepancy before I act on it. I have…

What I have: 96.4% · Janoshik · 98.8%. 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…

What I have: racemisation · orforglipron · 37 °C. I can predict the outcome but I cannot explain it, which means I will get the next case wrong. I would like to know…

What I am working with: a formic acid mobile phase · a GLP-1 receptor agonist · a wide-pore C18 column. I keep seeing this stated as a fact with no explanation…

Conditions: 96.4% · VendorInvestigate · 98.2%. I have two candidate explanations and no way to distinguish them. The same procedure has worked without incident…

Stated plainly: 95.2% · a C18 column · survodutide. I have read the primary source rather than the summary, which has left me with more questions. I understand the…

What I have: 99.1% · retatrutide. 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…

For reference: 96.8% · semaglutide. I would rather understand the derivation than memorise the outcome. Two people I asked gave two answers that differ by a factor of…

The particulars: 98.8% · PeptideMeter · 96.4% · Janoshik. The comparison I want does not seem to exist anywhere in a form I can evaluate. I have read the arguments…